Stephan Haas
Research & Practice Areas
condensed matter theory, interacting and disordered many body systems, quantum magnetism, unconventional superconductivity, quantum information theory.
Center, Institute & Lab Affiliations
 USC Center for Quantum Information Science and Technology, Deputy Director
Biography
Stephan Haas was born in Berlin and spent his early years in both Germany and Japan, gaining exposure to diverse cultural and educational environments. He began his academic journey in physics at the Technische Universität Berlin, where he earned his Vordiplom in Physics in 1990. To further his studies, Stephan moved to the United States and completed his Ph.D. in Physics at the National High Magnetic Field Laboratory at Florida State University in 1995, focusing on theoretical quantum systems.
Following his doctorate, Stephan undertook a postdoctoral fellowship at the Swiss Federal Institute of Technology (ETH Zurich), where he expanded his research into quantum condensed matter physics. In 1998, he joined the faculty at the University of Southern California (USC), where he has been a member of the Department of Physics and Astronomy.
At USC, Stephan Haas and his research group focus on topics including quantum magnetism, superconductivity, and quantum information theory. Their work investigates microscopic models of interacting quantum systems, employing numerical techniques like Quantum Monte Carlo, Renormalization Group, and Exact Diagonalization to explore phase diagrams, ground states, and dynamical properties. Recently, his research has focused on the effects of interactions and disorder in topological quantum systems.
Education
 Ph.D. Physics, Florida State University, 1995
 M.A. Physics, Florida State University, 1993
 Vordiplom Physics, Technische Universitat Berlin, Germany, 1989

 Postdoc, ETH Zurich, 19951998

Tenure Track Appointments
 Professor, University of Southern California, 02/03/2006 –
 Associate Professor, University of Southern California, 01/01/2002 – 02/03/2006
 Assistant Professor, University of Southern California, 01/01/1998 – 01/01/2002
 PostDoctoral Associate, Theoretische Physik, Switzerland, 01/01/1995 – 01/01/1998
 Research Assistant, Florida State University, 01/01/1991 – 01/01/1995
 Teaching Assistant, Florida State University, 01/01/1990 – 01/01/1991

Summary Statement of Research Interests
Stephan Haas’s research focuses on quantum phase transitions, superconductivity, and nanotechnology. His group studies microscopic models of interacting electronic systems, using numerical techniques to explore their phase diagrams, thermodynamic properties, and excitation spectra.
His research in quantum magnetism involves examining phase diagrams, excitation spectra, and thermodynamic properties of quantum magnets. The group uses numerical simulations, such as Quantum Monte Carlo and exact diagonalization, to study impurity and fieldinduced magnetic order in quantum spin liquids.
The group’s work on superconductivity focuses on unconventional superconductors with nodal order parameters. They apply a generalized BCS mean field theory to investigate properties of cuprate, organic, and heavyfermion compounds. Recent studies include Gossamer phenomena, where two unconventional order parameters coexist.
In nanotechnology, the group develops adaptive quantum design algorithms to identify optimal spatial configurations of nanoscale building blocks, such as atoms and molecules. These algorithms have been used to tailor quasiparticle density of states in atomic clusters, design dielectric structures with specific transmission profiles for photonics, and engineer manybody wave functions in quantum wells.
The group examines quantum phase transitions through entanglement measures, like the vonNeumann entropy. Using Quantum Monte Carlo simulations, they study the scaling behavior of block entropy across quantum critical points and compare multipartite and bipartite entanglement in manybody systems.
Their research on topological quantum systems explores the effects of interactions and disorder on these systems, leading to complex phase diagrams with multiple topological sectors. The group also studies the dynamics of these systems, including simulations on quantum hardware, with an eye toward potential technological applications.
Overall, the research is strongly connected to current experimental efforts in quantum antiferromagnetism, hightemperature and heavyfermion superconductivity, and nanophotonics. By bridging theoretical studies with experimental findings, the group aims to contribute to the understanding and development of new quantum materials and technologies.
Research Keywords
condensed matter theory, interacting and disordered many body systems, quantum magnetism, unconventional superconductivity, quantum information theory.
Research Specialties
condensed matter theory, interacting and disordered many body systems, quantum magnetism, unconventional superconductivity, quantum information theory.
Detailed Statement of Research Interests

 (Fall 2020) PHYS 172. Applied Physics II: Electricity, Magnetism and Optics, MW, 10:00am – 10:50am, ONLINE
 (Fall 2021) PHYS 172. Applied Physics II: Electricity, Magnetism and Optics, MW, 10:00am – 10:50am, ONLINE
 (Fall 2022) PHYS 540. Solid State Physics, TTh, 10:00am – 11:50am
 (Fall 2023) PHYS 438B. Introduction to Quantum Mechanics and its Applications, TTh, 08:00am – 09:50am, KAP158
 (Fall 2024) PHYS 152. Fundamentals of Physics II: Electricity and Magnetism, TTh, 09:30am – 10:50am, SLH200
 (Spring 2025) PHYS 152. Fundamentals of Physics II: Electricity and Magnetism, TTh, 02:00pm – 03:20pm, SLH200

 current topics: fidelity measures of quantum information theory applied to quantum phase transitions, crossover from quantum mechanics to classical physics in nanostructures, quantum glass phases in disordered Heisenberg models

Book
 Levi, A., Haas, S. (2009). Optimal Device Design. Cambridge: Cambridge University Press.
Book Chapters
 Zhang, W., Haas, S. (2010). Switching Mechanism in Ferromagnetic Nanorings. Handbook of Nanophysics (Vol. 401) CRC Press, Taylor & Francis.
Journal Article
 Haas, S., Mercado, M., Chen, K., Darekar, P. H., Nakano, A., Felice, D., R., H. S. (2024). Dynamics of symmetryprotected topological matter on a quantum computer. Physical Review. Vol. B (/Physical), pp. eview. B, 110(7). https://doi.org/10.1103/physrevb.
 Wu, J., Yao, Y., Lin, M. L., Rösner, M., Du, Z., Watanabe, K., Taniguchi, T., Tan, P. H., Haas, S., Wang, H. (2022). SpinPhonon Coupling in Ferromagnetic Monolayer Chromium Tribromide. Advanced materials (Deerfield Beach, Fla.). Vol. 34 (20), pp. e2108506. PubMed Web Address
 Courcoubetis, G., Xu, C., Nuzhdin, S. V., Haas, S. (2022). Avalanches during epithelial tissue growth; Uniform Growth and a drosophila eye disc model. PLoS computational biology. Vol. 18 (3), pp. e1009952. PubMed Web Address
 Courcoubetis, G., Gangan, M. S., Lim, S., Guo, X., Haas, S., Boedicker, J. Q. (2022). Formation, collective motion, and merging of macroscopic bacterial aggregates. PLoS computational biology. Vol. 18 (1), pp. e1009153. PubMed Web Address
 Song, B., Jiang, Z., Liu, Z., Wang, Y., Liu, F., Cronin, S. B., Yang, H., Meng, D., Chen, B., Hu, P., Schwartzberg, A. M., Cabrini, S., Haas, S., Wu, W. (2020). Probing the Mechanisms of Strong Fluorescence Enhancement in Plasmonic Nanogaps with Subnanometer Precision. ACS nano. Vol. 14 (11), pp. 1476914778. PubMed Web Address
 Courcoubetis, G., Ali, S., Nuzhdin, S. V., Marjoram, P., Haas, S. (2019). Threshold response to stochasticity in morphogenesis. PloS one. Vol. 14 (1), pp. e0210088. PubMed Web Address
 Ngo, Y., Wang, Y., Haas, S., Noskov, S. Y., Farley, R. A. (2016). K+ Block Is the Mechanism of Functional Asymmetry in Bacterial Na(v) Channels. PLoS computational biology. Vol. 12 (1), pp. e1004482. PubMed Web Address
 Yeshwanth, S., Rigol, M., Haas, S., Venuti, L. C. (2015). Small quench dynamics as a probe for trapped ultracold atoms. PHYSICAL REVIEW A. Vol. 91 (6)
 Ngo, V. A., Di, R., Haas, S. (2014). Is the Gquadruplex an effective nanoconductor for ions?. The journal of physical chemistry. B. Vol. 118 (4), pp. 86472. PubMed Web Address
 Ngo, V., Stefanovski, D., Haas, S., Farley, R. A. (2014). Nonequilibrium dynamics contribute to ion selectivity in the KcsA channel. PloS one. Vol. 9 (1), pp. e86079. PubMed Web Address
 Ngo, V., Wu, H., Haas, S., Farley, R. (2014). Mechanism of NonSelectivity in NAK Channel. BIOPHYSICAL JOURNAL. Vol. 106 (2), pp. 558A558A.
 Tabbakhian, M., Ngo, V., Haas, S., Farley, R. (2014). Amino Acid Substitutions for T75 in KCSA Alter Ion Selectivity. BIOPHYSICAL JOURNAL. Vol. 106 (2), pp. 539A539A.
 Vasseur, R., Trinh, K., Haas, S., Saleur, H. (2013). Crossover physics in the nonequilibrium dynamics of quenched quantum impurity systems. Physical review letters. Vol. 110 (24), pp. 240601. PubMed Web Address
 Chancellor, N., Petri, C., Haas, S. (2013). NonMarkovian equilibration controlled by symmetry breaking. PHYSICAL REVIEW B. Vol. 87 (18)
 Venuti, L. C., Yeshwanth, S., Haas, S. (2013). Equilibration times in clean and noisy systems. PHYSICAL REVIEW A. Vol. 87 (3)
 Song, K. W., Liang, Y., Lim, H., Haas, S. (2013). Possible nematic order driven by magnetic fluctuations in iron pnictides. PHYSICAL REVIEW B. Vol. 88 (5)
 Trinh, K., Haas, S. (2013). Bond disorder in evenleg Heisenberg ladders. PHYSICAL REVIEW B. Vol. 87 (7)
 Ngo, V., Stefanovski, D., Farley, R., Haas, S. (2013). Thermal Effects and FreeEnergy Barrier Differences in the Ion Selectivity Mechanism of KcsA. BIOPHYSICAL JOURNAL. Vol. 104 (2), pp. 128A128A.
 Ngo, V. A., Haas, S. (2012). Demonstration of Jarzynski’s equality in open quantum systems using a stepwise pulling protocol. Physical review. E, Statistical, nonlinear, and soft matter physics. Vol. 86 (3 Pt 1), pp. 031127. PubMed Web Address
 Yu, R., Yin, L., Sullivan, N. S., Xia, J. S., Huan, C., PaduanFilho, A., Oliveira, J. r., Haas, S., Steppke, A., Miclea, C. F., Weickert, F., Movshovich, R., Mun, E. D., Scott, B. L., Zapf, V. S., Roscilde, T. (2012). Bose glass and Mott glass of quasiparticles in a doped quantum magnet. Nature. Vol. 489 (7416), pp. 37984. PubMed Web Address
 Chancellor, N., Haas, S. (2012). Using the J(1)J(2) quantum spin chain as an adiabatic quantum data bus. NEW JOURNAL OF PHYSICS. Vol. 14
 Chang, Y., Albash, T., Haas, S. (2012). Quantum Hall states in graphene from straininduced nonuniform magnetic fields. PHYSICAL REVIEW B. Vol. 86 (12)
 Ngo, V. A., Haas, S. (2012). Demonstration of Jarzynski’s equality in open quantum systems using a stepwise pulling protocol. PHYSICAL REVIEW E. Vol. 86 (3)
 Song, K. W., Liang, Y., Haas, S. (2012). Excitonic instabilities and insulating states in bilayer graphene. PHYSICAL REVIEW B. Vol. 86 (20)
 Trinh, K., Haas, S., Yu, R., Roscilde, T. (2012). Correlations in quantum spin ladders with site and bond dilution. PHYSICAL REVIEW B. Vol. 85 (3)
 Das, A., Garnerone, S., Haas, S. (2011). Entanglement and its evolution after a quench in the presence of an energy current. Phys. Rev. A. Vol. 84, pp. 052317.
 Vedadi, M., Haas, S. (2011). Mechanochemical pathways to H20 and CO2 splitting. Appl. Phys. Lett.. Vol. 99, pp. 154105.
 Dahal, H., Muniz, R., Haas, S., Graf, M., Balatsky, A. (2011). Visualization of nanoplasmons in graphene. Phil. Mag.. Vol. 10
 Albash, T., Haas, S. (2011). Quantum liquids move to a higher dimension. Physics. Vol. 4, pp. 62.
 Chancellor, N., Haas, S. (2011). Propagation of disturbances in degenerate quantum systems. Phys. Rev. B. (84), pp. 035130.
 Chang, Y., Haas, S. (2011). Defect Induced Resonances and Magnetic Patterns in Graphene. Phys. Rev. B. Vol. 83, pp. 085406.
 Das, A., Garnerone, S., Haas, S. (2011). Entanglement and its evolution following a quench in the presence of an energy current. PHYSICAL REVIEW A. Vol. 84 (5)
 Chang, Y. C., Haas, S. (2011). Defectinduced resonances and magnetic patterns in graphene. PHYSICAL REVIEW B. Vol. 83 (8)
 BrayAli, N., Haas, S. (2010). How to turn a topological insulator into a superconductor. Physics. pp. 11.
 Yu, R., Haas, S., Roscilde, T. (2010). Universal phase diagram of disordered bosons from a doped quantum magnet. Euro. Phys. Lett.. Vol. 89, pp. 10009.
 Garnerone, S., de Oliveira, T., Haas, S., Zanardi, P. (2010). Statistical properties of random matrix product states. Phys. Rev. A. Vol. 82, pp. 052312.
 Yu, R., Nohadani, O., Haas, S., Roscilde, T. (2010). Magnetic Boseglass phases of coupled antiferromagnetic dimers with site dilution. Phys. Rev. B. Vol. 82, pp. 134437.
 Diez, M., Chancellor, N., Haas, S., Campo Venuti, L., Zanardi, P. (2010). Local quenches in frustrated quantum spin chains: Global versus subsystem equili bration. Phys. Rev. A. Vol. 82, pp. 032113.
 Muniz, R., Dahal, H., Balatsky, A., Haas, S. (2010). Impurityassisted nanoscale localization of plasmonic excitations in graphene. Phys. Rev. B. Vol. 82, pp. 081411.
 Zhang, W., Haas, S. (2010). Phase diagram of magnetization reversal processes in nanorings. Phys. Rev. B. Vol. 81, pp. 064433.
 Diez, M., Chancellor, N., Haas, S., Venuti, L. C., Zanardi, P. (2010). Local quenches in frustrated quantum spin chains: Global versus subsystem equilibration. PHYSICAL REVIEW A. Vol. 82 (3)
 Yu, R., Nohadani, O., Haas, S., Roscilde, T. (2010). Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution. PHYSICAL REVIEW B. Vol. 82 (13)
 Tsomokos, D., Hamma, A., Zhang, W., Fazio, R., Haas, S. (2009). Topological order following a quantum quench. Phys. Rev. A. Vol. 80, pp. 060302.
 BrayAli, N., Ding, L., Haas, S. (2009). Topological order in paired states of fermions in two dimensions with breaking of parity and timereversal symmetries. Phys. Rev. B. Vol. 80, pp. 060302.
 Rigol, M., Shastry, S., Haas, S. (2009). Fidelity and superconductivity in twodimensional tJ models. Phys. Rev. B. Vol. 80, pp. 094529.
 Yu, R., Roscilde, T., Haas, S. (2009). Revealing Novel Quantum Phases in Quantum Antiferromagnets on Random Lattices. Condensed Matter Physics. Vol. 12, pp. 519.
 Zhang, W., Haas, S. (2009). Adaptation and Performance of the Cartesian Coordinates Fast Multipole Method for Nanomagnetic Simulations. Journal of Magnetism and Magnetic Materials. Vol. 321, pp. 3687.
 Muniz, R., Haas, S., Levi, A., Grigorenko, I. (2009). Plasmonic excitations in tightbinding nanostructures. Phys. Rev. B. Vol. 80, pp. 045413.
 Jacobson, N., Garnerone, S., Haas, S., Zanardi, P. (2009). Scaling of the fidelity susceptibility in a disordered quantum spin chain. Phys. Rev. B. Vol. 79, pp. 184427.
 Oliveira, B., Haas, S. (2009). Electronphonon bound states and impurity band formation in quantum wells. Phys. Rev. B. Vol. 79, pp. 155102.
 Yu, R., Trinh, K., Moreo, A., Daghofer, M., Riera, J., Haas, S., Dagotto, E. (2009). Magnetic and metallic state at intermediate Hubbard U coupling in multiorbital models for undoped iron pnictides. Phys. Rev. B. Vol. 79, pp. 104510.
 Garnerone, S., Abasto, D., Haas, S., Zanardi, P. (2009). Fidelity in topological quantum phases of matter. Phys. Rev. A. Vol. 79, pp. 032302.
 Rigol, M., Shastry, S., Haas, S. (2009). Effects of Strong Correlations and Disorder in dWave Superconductors. Phys. Rev. B. Vol. 79, pp. 052502.
 RoyChoudry, K., Haas, S., Levi, A. (2009). Quantum fluctuations in small lasers. Phys. Rev. Lett.. Vol. 102, pp. 053902.
 Garnerone, S., Jacobson, N., Haas, S., Zanardi, P. (2009). Fidelity Approach to the Disordered Quantum XY Model. Phys. Rev. Lett.. Vol. 102, pp. 057205.
 Cassidy, A., Grigorenko, I., Haas, S. (2008). Formation of collective excitations in quasionedimensional metallic nanostructures: size and density dependence. Physical Review B. Vol. 77, pp. 245404.
 Ding, L., BrayAli, N., Yu, R., Haas, S. (2008). Subarea law of entanglement in nodal fermionic systems. Physical Review Letters. Vol. 100, pp. 215701.
 Hamma, A., Zhang, W., Haas, S., Lidar, D. (2008). Entanglement, fidelity, and topological entropy in a quantum phase transition to topological order. Physical Review B. Vol. 77, pp. 155111.
 Zhang, W., Singh, R., BrayAli, N., Haas, S. (2008). Scaling Analysis and Application: Phase Diagram of Magnetic Nanorings and Elliptical Particles. Physical Review B. Vol. 77, pp. 144428.
 Yu, R., Saleur, H., Haas, S. (2008). Entanglement entropy in the twodimensional random transverse field Ising model. Physical Review B. Vol. 77, pp. 140402.
 Grigorenko, I., Haas, S., Balatsky, A. (2008). Optimal control of electromagnetic field using metallic nanoclusters. New Journal Of Physics. Vol. 10, pp. 043017.
 Yu, R., Roscilde, T., Haas, S. (2008). Field induced disorderedlocalmoment phase in sitediluted spingap antiferromagnets. New Journal of Physics. Vol. 10, pp. 013034.
 Zhang, W., Singh, R., BrayAli, N., Haas, S. (2008). Scaling analysis and application: Phase diagram of magnetic nanorings and elliptical nanoparticles. PHYSICAL REVIEW B. Vol. 77 (14)
 Parker, D., Haas, S. (2007). T1^(1) peak near Tc in unconventional BardeenCooperSchrieffer superconductors. Phys. Rev. B. Vol. 75, pp. 052501.
 Sengupta, P., Haas, S., Raghavan, A. (2007). Disorderenhanced phase coherence in trapped bosons on optical lattices. New J. Physics. Vol. 9, pp. 103.
 Roscilde, T., Haas, S. (2007). Mott glass in sitediluted S=1 antiferromagnets with singleion anisotropy. Phys. Rev. Lett.. Vol. 99, pp. 047205.
 Sengupta, P., Haas, S. (2007). Quantum glass phases in the disordered BoseHubbard model. Phys. Rev. Lett.. Vol. 99, pp. 050403.
 Parker, D., Haas, S., Balatsky, A. (2007). Generalized cuprate gap symmetry and higher dwave harmonics: Effects of correlation length, doping, temperature, and impurity scattering. Phys. Rev. B. Vol. 76, pp. 104503.
 Haas, S., Maki, K., Dahm, T., Thalmeier, P. (2007). Anatomy of Gossamer superconductivity. Curr. Appl. Phys.. Vol. 7, pp. 64.
 Parker, D., Haas, S. (2007). T1(1) peak near Tc in unconventional BardeenCooperSchrieffer superconductors. PHYSICAL REVIEW B. Vol. 75 (5)
 Parker, D., Haas, S. (2007). T1(1) peak near Tc in unconventional BardeenCooperSchrieffer superconductors (vol 75, art no 052501 2007). PHYSICAL REVIEW B. Vol. 76 (14)
 Won, H., Haas, S., Maki, K. (2007). Bottomup approach to hightemperature superconductivity. PHYSICA STATUS SOLIDI BBASIC SOLID STATE PHYSICS. Vol. 244 (7), pp. 24072414.
 Grigorenko, I., Haas, S., Levi, A. F. (2006). Electromagnetic response of brokensymmetry nanoscale clusters. Physical review letters. Vol. 97 (3), pp. 036806. PubMed Web Address
 Grigorenko, I., Haas, S. W., Levi, A. (2006). Electromagnetic response of brokensymmetry nanoscale clusters. Physical Review Letters/American Physical Society. Vol. 97, pp. 036906 (2006).
 Li, W., Ding, L., Yu, R., Roscilde, T., Haas, S. W. (2006). Scaling Behavior of Entanglement in Two and ThreeDimensional Free Fermions. Physical Review B/American Physical Society. Vol. 74, pp. 073103.
 Won, H., Haas, S. W., Maki, K., Parker, D., Dora, B., Virosztek, A. (2006). Gossamer superconductivity, new paradigm?. Phys. Stat. Sol. (b). Vol. 243, pp. 37.
 Parker, D., Haas, S. W., Maki, K. (2006). BCS theory of unconventional superconductivity in PrOs_4Sb_12. Physica B/Elsevier Science. Vol. 378380, pp. 902.
 Maki, K., Haas, S. W., Dora, B., Virosztek, A. (2006). New world of Gossamer superconductivity. Phys. Stat. Sol. (c)/Wiley. Vol. 3, pp. 3156.
 Roscilde, T., Haas, S. W. (2006). BoseEinstein Condensation vs. Localization of Bosonic Quasiparticles in Disordered WeaklyCoupled Dimer Antiferromagnets. J. Phys. B: At. Mol. Opt. Phys./Institute of Physics. Vol. 39, pp. 153.
 Yu, R., Roscilde, T., Haas, S. (2006). Quantum disorder and Griffiths singularities in bonddiluted twodimensional Heisenberg antiferromagnets. Physical Review B/American Physical Society. Vol. 73, pp. 064406.
 Schmid, P., Haas, S., Levi, A. (2006). Synthesis of Electron Transmission in Nanoscale Semiconductor Devices. Appl. Phys. Lett.. Vol. 88, pp. 013502.
 Li, W., Ding, L., Yu, R., Roscilde, T., Haas, S. (2006). Scaling Behavior of Entanglement in Two and ThreeDimensional Free Fermions. Phys. Rev. B. Vol. 74, pp. 073103.
 Roscilde, T., Haas, S. (2006). BoseEinstein condensation versus localization of bosonic quasiparticles in disordered weaklycoupled dimer antiferromagnets. JOURNAL OF PHYSICS BATOMIC MOLECULAR AND OPTICAL PHYSICS. Vol. 39 (10), pp. S153S162.
 Li, W., Ding, L., Yu, R., Roscilde, T., Haas, S. (2006). Scaling behavior of entanglement in two and threedimensional freefermion systems. PHYSICAL REVIEW B. Vol. 74 (7)
 Roscilde, T., Yu, R., Haas, S. (2006). Quantumdisordered antiferromagnets on random lattices. Low Temperature Physics, Pts A and B. Vol. 850, pp. 10731074.
 Maki, K., Won, H., Parker, D., Haas, S. W., Izawa, K., Matsuda, Y. (2005). Triplet superconductivity in PrOs_4Sb_12. Physica B/Elsevier Science. Vol. 359, pp. 527529.
 Nohadani, O., Haas, S. W. (2005). BoseGlass Phases in Disordered Quantum Magnets. Physical Review Letters/American Physical Society. Vol. 95, pp. 227201.
 Roscilde, T., Haas, S. W. (2005). Quantum localization in bilayer Heisenberg antiferromagnets with site dilution. Physical Review Letters/American Physical Society. Vol. 95, pp. 207206.
 Yu, R., Roscilde, T., Haas, S. W. (2005). Quantum percolation in twodimensional antiferromagnets. Physical Review Letters/American Physical Society. Vol. 94, pp. 197204.
 Roscilde, T., Verrucchi, P., Fubini, A., Haas, S. W., Tognetti, V. (2005). Entanglement and factorized ground states in twodimensional quantum antiferromagnets. Physical Review Letters/American Physical Society. Vol. 94, pp. 147208.
 Thalken, J., Haas, S. W., Levi, A. (2005). Synthesis for semiconductor device design. Journal of Applied Physics/American Institute of Physics. Vol. 98, pp. 044508.
 Nohadani, O., Haas, S. W. (2005). Quantum Phase Transitions in Coupled Dimer Compounds. Physical Review B/American Physical Society. Vol. 72, pp. 024440.
 Won, H., Haas, S. W., Parker, D., Maki, K. (2005). HighT_c Cuprate Superconductivity in a Nutshell. Phys. Stat. Sol. (b). Vol. 242, pp. 363.
 Roscilde, T., Verrucchi, P., Fubini, A., Haas, S. W., Tognetti, V. (2004). Studying quantum spin systems through entanglement estimators. Physical Review Letters/American Physical Society. Vol. 93, pp. 167203.
 Roscilde, T., Feiguin, A., Chernyshev, A., Liu, S., Haas, S. W. (2004). AnisotropyInduced Ordering in the Quantum J_1J_2 Antiferromagnet. Physical Review Letters/American Physical Society. Vol. 93, pp. 017203.
 Gheorma, I., Haas, S. W., Levi, A. (2004). Aperiodic NanoPhotonic Design. Journal of Applied Physics/American Institute of Physics. Vol. 95, pp. 1420.
 Nohadani, O., Normand, B., Haas, S. W. (2004). Universal scaling at fieldinduced magnetic phase transitions. Physical Review B/American Physical Society. Vol. 69, pp. 220402.
 Thalken, J., Chen, Y., Levi, A., Haas, S. W. (2004). Adaptive Quantum Design of Atomic Clusters. Physical Review B/American Physical Society. Vol. 69, pp. 195410.
 Won, H., Maki, K., Haas, S. W., Oelscher, N., Weickert, F., Gegenwart, P. (2004). Upper Critical Field and FuldeFerrellLarkinOvchinnikov State in CeCoIn_5. Physical Review B/American Physical Society. Vol. 69, pp. 180504.
 Maki, K., Haas, S. W., Parker, D., Won, H., Izawa, K., Matsuda, Y. (2004). Triplet superconductivity in the skutterudite PrOs_4Sb_{12}. Europhysics Letters/EDP Sciences. Vol. 68, pp. 720.
 Won, H., Parker, D., Haas, S. W., Maki, K. (2004). Aspects of Nodal Superconductivity. Curr. Appl. Phys.. Vol. 4, pp. 523.
 Thalken, J., Li, W., Haas, S. W., Levi, A. (2004). Adaptive Design of Excitonic Absorption in BrokenSymmetry Quantum Wells. Applied Physics Letters/American Institute of Physics. Vol. 85, pp. 121.
 Maki, K., Won, H., Haas, S. W. (2003). Quasiparticle spectrum of the hybrid s+gwave superconductors YNi_2B_2C and LuNi_2B_2C. Physical Review B/American Physical Society. Vol. 69, pp. 012502.
 Haas, S., Maki, K. (2003). Reply to Comment on “Theory of caxis Josephson tunneling in d_{x^2y^2}wave superconductors”. Phys. Rev. B. Vol. 68, pp. 226502.
 Haas, S., Chen, Y., Rong, Y., Li, W., Nohadani, O., Levi, A. (2003). Adaptive Design of NanoScale Dielectric Structures for Photonics. J. Appl. Phys.. Vol. 94, pp. 6065.
 Haas, S., Wessel, S., Jagannathan, A. (2003). Quantum Antiferromagnetism in Quasicrystals. Phys. Rev. Lett.. Vol. 90, pp. 177205.
 Haas, S., Maki, K. (2003). Theory of caxis Josephson tunneling in dwave superconductors. Phys. Rev. B. Vol. 67, pp. 020510(R).
 Haas, S., Parker, D., Maki, K. (2003). Impurity Bound States in the Pseudogap Phase of HighT_c Cuprates. Acta Phys. Pol.. Vol. B34, pp. 583.
 Haas, S. W. (2002). Redistribution of Spectral Weight in Spin1/2Doped Haldane Chains. S. Wessel and S. Haas, to be published in Phys. Rev. B (2002).
 Haas, S. W. (2002). Anisotropic swave superconductivity in MgB2. S. Haas and K. Maki, Rev. B 65, 020502 (R) (2002).
 Haas, S., Maki, K., Gerami, R. (2002). Effects of Andreev Scattering on the Tunneling Conductance in Superconducting MgB_2. J. Phys. Chem. Solids. Vol. 63, pp. 1501.
 Haas, S. W. (2001). FieldInduced Magnetic Order in Quantum Spin Liquids. S. Wessel, M. Olshanii, and S. Haas, Phys. Rev. Lett. 87, 206407 (2001).
 Haas, S. W. (2001). Phase Diagram and Thermodynamic Properties of the Square Lattice of Antiferromagnetic Spin1/2 Triangles in La4Cu3MoO12. S. Wessel and S. Haas, Phys. Rev. B 63, 140403 (2001).
 Haas, S., Wessel, W., Normand, B., Sigrist, M. (2001). Order by Disorder from NonMagnetic Impurities in a TwoDimensional Quantum Spin Liquid. Phys. Rev. Lett.. Vol. 86, pp. 1086.
 Haas, S., Yu, W. (2001). Dynamical Properties of SpinOrbital Chains in a Magnetic Field. Phys. Rev. B. Vol. 63, pp. 24423.
 Haas, S., Maki, K. (2000). Impurity Bound States and Symmetry of the Superconducting Order Parameter in Sr_2RuO_4. Phys. Rev. B. Vol. 62, pp. R11969.
 Haas, S., Maki, K. (2000). QuasiParticle Bound States around Impurities in d_{x^2y^2}Wave Superconductors. Phys. Rev. Lett.. Vol. 85, pp. 2172.
 Haas, S., Maki, K. (2000). Paramagnetic Reentrance Effect in NS Proximity Cylinders. Phys. Lett. A. Vol. 272, pp. 271.
 Haas, S., Wessel, S. (2000). Magnetic Field Induced Ordering in QuasiOneDimenstional Quantum Magnets. Eur. Phys. J. B. Vol. 16, pp. 393.
 Haas, S., Yu, W. (2000). Excitation Spectra of Structurally Dimerized and SpinPeierls Chains in a Magnetic Field. Phys. Rev. B. Vol. 62, pp. 344.
 Haas, S., Wessel, S. (2000). ThreeDimensional Ordering in a Weakly Coupled Antiferromagnetic Ladders and Chains. Phys. Rev. B. Vol. 62, pp. 316.
 Haas, S., Wessel, S. (2000). Excitation Spectra and Thermodynamical Response of Segmented Heisenberg Spin Chains. Phys. Rev. B. Vol. 61, pp. 15262.
 Haas, S., Gagliardini, P., Rice, T. (1998). Generalization of the Luttinger Theorem for Fermionic Ladder Systems. Phys. Rev. B. Vol. 58, pp. 9603.
 Haas, S., Duffy, D., Kim, E. (1998). Evolution of the LowEnergy Excitation Spectrum from the Pure Hubbard Ladder to the SO(5) Ladder: A Numerical Study. Phys. Rev. B. Vol. 58, pp. 5932.
 Haas, S. (1998). Spectral Analysis of Correlated OneDimensional Systems with Impurities. Phys. Rev. Lett.. Vol. 80, pp. 4052.
 Haas, S., Rice, T., Sigrist, M., Zhang, F. (1997). Lightly Doped tJ ThreeLeg Ladders –an Analog for the Underdoped Cuprates. Phys. Rev. B. (14655)
 Haas, S., Augier, D., Poilblanc, D., Delia, A., Dagotto, E. (1997). Dynamical Properties of the Spin–Peierls Compound alphaNaV_2O_5. Phys. Rev. B. Vol. 56, pp. R5732.
 Haas, S., Balatsky, A., Sigrist, M., Rice, T. (1997). Extended Gapless Regions in Disordered d_{x^2y^2}Wave Superconductors. Phys. Rev. B. Vol. 56, pp. 5108.
 Haas, S., Duffy, D., Nazarenko, A., Moreo, A., Riera, J., Dagotto, E. (1997). Hole Doping Evolution of the Quasiparticle Band in Models of Strongly Correlated Electrons for the HighT_c Cuprates. Phys. Rev. B. Vol. 56, pp. 5597.
 Haas, S., Favand, J., Penc, K., Mila, F., Dagotto, E. (1997). Spectral Functions of OneDimensional Models of Correlated Electrons. Phys. Rev. B. Vol. 55, pp. R4859.
 Haas, S., Frischmuth, B., Sierra, G., Rice, T. (1997). LowEnergy Properties of Antifgerromagnetic Spin1/2 Heisenberg Ladders with an Odd Number of Legs. Phys. Rev. B. Vol. 55, pp. R3340.
 Haas, S., Zhang, F., Mila, F., Rice, T. (1996). Spin and Charge Texture around Impurities in the CuO_2 Planes. Phys. Rev. Lett. Vol. 77, pp. 3021.
 Haas, S., Dagotto, E. (1996). Photoemission Spectra in tJ Ladders with Two Legs. Phys. Rev. B. Vol. 54, pp. R3718.
 Haas, S., Dagotto, E. (1995). Predictions for Neutron Scattering and Photoemission Experiments on CuGeO_3. Phys. Rev. B. Vol. 52, pp. R14396.
 Haas, S., Nori, F., Merlin, R., Sandvik, A., Dagotto, E. (1995). Magnetic Raman Scattering in TwoDimensional Spin1/2 Heisenberg Antiferromagnets: Spectral Shape Anomaly and Magnetostrictive Effects. Phys. Rev. Lett.. Vol. 75, pp. 553.
 Haas, S., Moreo, A., Dagotto, E. (1995). Antiferromagnetically Induced Photoemission Band in the Cuprates. Phys. Rev. Lett. Vol. 74, pp. 4281.
 Haas, S., Moreo, A., Dagotto, E. (1995). Quasiparticle Dispersion of the tJ and Hubbard Models. Phys. Rev. B. Vol. 51, pp. 12045.
 Haas, S., Nazarenko, A., Vos, K., Dagotto, E., Gooding, R. (1995). Photoemission Spectra of Sr_2CuO_2Cl_2: A Theoretical Analysis. Phys. Rev. B. Vol. 51, pp. 8676.
 Haas, S. (1995). Doping Dependence of the Fermi Surface in the tJ Model. Phys. Rev. B. Vol. 51, pp. 11748.
 Haas, S., Dagotto, E., Nazarenko, A., Riera, J. (1995). Liaison between Superconductivity and Phase Separation. Phys. Rev. B. Vol. 51, pp. 5989.
 Haas, S., Riera, J., Dagotto, E. (1993). Random Exchange Disorder in the Spin1/2 XXZ Chain. Phys. Rev. B. Vol. 48, pp. 3281.
 Haas, S., Riera, J., Dagotto, E. (1993). Dynamical Properties of Antiferromagnetic Heisenberg Spin Chains. Phys. Rev. B. Vol. 48, pp. 13174.
 Haas, S. (1992). Isolated Ferromagnetic Bonds in the TwoDimensional Spin1/2 Heisenberg Antiferromagnet. Phys. Rev. B. Vol. 46, pp. 3135.
Proceedings
 Won, H., Haas, S. W., Parker, D., Telang, S., Vanyolos, A., Maki, K. (2005). BCS Theory of Nodal Superconductors. pp. 343. AIP Conference Proceedings.
 Maki, K., Haas, S. W., Parker, D., Won, H. (2005). Perspectives on Nodal Superconductors. pp. 1. Chinese Journal of Physics.
 Won, H., Haas, S. W., Maki, K. (2004). Upper Critical Field and FuldeFerrellLarkinOvchinnikov State in CeCoIn_5. pp. 191. Journal of Magnetism and Magnetic Matter.
 Normand, B., Matsumoto, M., Nohadani, O., Rice, T., Sigrist, M., Haas, S. W. (2004). Pressure and fieldinduced magnetic quantum phase transition in TlCuCl_3. pp. 583. Acta Phys. Pol. B.

 Alexander von Humboldt Fellowship Recipient, 20132014
 USC Associates Award For Excellence In Teaching, 20092010
 NIH/NSF Career Development Award, 20002005
 USC or School/Dept Award for Teaching, USC General Education Award, 2001
 USC Raubenheimer Outstanding Junior Faculty Award, 2001
 Fulbright Award, Scholar, 19901991

Administrative Appointments
 Chair, 08/16/2024 – 08/15/2027
 Chair, 08/16/2021 – 08/15/2024
 Chair, 08/16/2018 – 08/15/2021
 Chair, 08/16/2015 – 08/15/2018
 Vice Dean for Research, 01/01/2011 – 09/30/2012

Editorships and Editorial Boards
 Associate Editor, Journal of Superconductivity and Novel Magnetism, 2018 –
Professional Memberships
 American Association for the Advancement of Science, 1998 – 2010
 American Association of Physics Teachers, 1998 – 2010
 American Physical Society, 1992 – 2010
Reviewer for Publications
 Physical Review Letters, Physical Review B, Journal of Physics, National Science Foundation, Departm, Physical Review Letters, Physical Review B, Journal of Physics, National Science Foundation, Department of Energy, Canadian Science Foundation, 2004 –