# Dr. Ziqiang Wang

## graduate program director and professor of physics

Phone: 617-552-0687

Higgins Hall 330F

E-Mail: ziqiang.wang@bc.edu

### Education

Ph.D., Columbia University

### Areas of Research

Theory of correlated electron materials including high temperature superconductors and other complex oxides such as cobaltates and ruthenates. Itinerant and localized magnetism and heavy fermion systems. Quantum spin systems. Unconventional superconductivity. Emergent quantum electronic states and topologically ordered phases of matter. Fractional and integer quantum Hall systems and other mesoscopic systems including graphene.

### Selected Publications

- "Observation of a Novel Orbital Selective Mott Transition in Ca1.8Sr0.2RuO4,"
*Phys. Rev. Lett.***103**, 097001 (2009). - "Valence Bond Glass Theory of Electronic Disorder and the Pseudogap State of High-Temperature Cuprate Superconductors,"
*Phys. Rev. Lett*.**102**, 107001 (2009). - "Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature Superconductor Bi2Sr2-
*x*La*x*CuO6+,"*Phys. Rev. Lett.***101**, 207002 (2008). - “Nodal
*d*+*id*Pairing and Topological Phases on the Triangular Lattice of NaxCoO2·*y*H2O: Evidence for an Unconventional Superconducting State,”*Phys. Rev. Lett.***100**, 217002 (2008). - “Correlating Off-Stoichiometric Doping and Nanoscale Electronic Inhomogeneity in the High-
*T*c Superconductors,”*Phys. Rev. Lett.***98**, 076401 (2007). - “Charge and Spin Order on the Triangular Lattice: Na
*x*CoO2 at*x*=0.5,”*Phys. Rev. Lett.***98**, 226402 (2007). - “Itinerant and Localized Magnetism on the Triangular Lattice: Sodium-Rich Phases of Na
*x*CoO2,”*Phys. Rev. B***76**, 180402 (2007). - “Inhomogeneous States with Checkerboard Order in the
*t-J*model,”*Phys. Rev. B***73**, 060501 (2006). - “Electron Correlation and Fermi Surface Topology in NaxCoO2,"
*Phys. Rev. Lett.***94**, 206401 (2005). - “Edge-Current in Time-Reversal Symmetry Breaking Superconductors,"
*Phys. Rev. Lett.***95**, 017004 (2005). - “Vortices, Instantons and Deconfinement in Bilayer Quantum Hall Exciton Superfluid,"
*Phys. Rev. Lett.***94**, 176804 (2005). - "Tunneling, Dissipation, and Superfluid Transition in Quantum Hall Bilayers,"
*Phys. Rev. Lett.***92**, 136803 (2004). - “ARPES on Na0.6CoO2: Fermi Surface and Unusual Band Dispersion,”
*Phys. Rev. Lett.***92**, 246403 (2004). - “Fermi Surface Topology of Ca1.5Sr0.5RuO4 Determined by ARPES,”
*Phys. Rev. Lett.***93**, 177007 (2004). - “Quasiparticle Line Shape of Sr2RuO4 and Its Relation to Anisotropic Transport,”
*Phys. Rev. Lett.***92**, 137002 (2004). - “Pseudogap, Competing Order, and the Coexistence of Staggered Flux and
*d*-Wave Pairing in High-Temperature Superconductors,”*Phys. Rev. B***70**, 020501(R) (2004). - "Phase Diagram for Quantum Hall Bilayers at nu=1,"
*Phys. Rev. Lett.***91**, 116802 (2003). - "Spectral Properties of a Quantum Impurity in
*d*-Wave Superconductors,"*Phys. Rev. B***67**, 180507 (2003). - "Local Moment Formation in the Superconducting State of a Doped Mott Insulator,''
*Phys. Rev. Lett.***89**, 217002 (2002). - "Electron-Electron Interaction, Quantum Coulomb Gap, and Dynamical Scaling Near Integer Quantum Hall Transitions,''
*Phys. Rev. B***65**, 195316 (2002). - "Role of Disorder in Half-Filled High Landau Levels,"
*Phys. Rev. B, Rapid Communications***66**, 161103 (2002). - "Inhomogeneous
*d*-Wave Superconducting State of a Doped Mott Insulator,''*Phys. Rev. B***65**, 064509 (2002). - Inhomogeneous
*d*-Wave Superconducting State of a Doped Mott Insulator," cond-mat/0107004,*Phys. Rev. B***65**, 064509 (2002). - "Electron-Electron Interactions, Quantum Coulomb Gap, and Dynamical Scaling Near Integer Quantum Hall Transitions,"
*cond-mat/0110299*, (2001). - "Role of Disorder in Half-Filled High Landau Levels,"
*cond-mat/0112233*, (2001). - "Superconductivity Near Itinerant Ferromagnetic Quantum Criticality,"
*Phys. Rev. Lett.***87**, 257001 (2001). - "Microscopic Electronic Inhomogeneity in High-Tc Superconductor Bi2Sr2CaCu2O{8+x},"
*Nature***413**, 282 (2001). - "Superconductivity Near Itinerant Ferromagnetic Quantum Criticality,"
*Phys. Rev. Lett.***87**, 257001 (2001). - "On Analytic Structure of One-Dimensional Localization Theory: Re-Examining Mott's Law,"
*Phys. Rev. Lett.***86**, 4715 (2001). - "Thermodynamic and Tunneling Density of States of the Integer Quantum Hall Critical State,"
*Phys. Rev. B***65**, 041302(R) (2001). - "Pseudogaps and Quantum Criticality in Underdoped Cuprates,"
*Physica C***341**, 207 (2000). - "Short-Range Interactions and Scaling at Integer Quantum Hall Transitions,"
*Phys. Rev. B***61**, 8326 (2000). - "Quantum Disordered Slave Bosons Theory of Underdoped Cuprates,"
*Europhys. Lett.***50**, 656 (2000). - "Bulk Tunneling Near Integer Quantum Hall Transitions,"
*Phys. Rev. Lett.***83**, 828 (1999). - "Compressibility of the Two-Dimensional Infinite-U Hubbard Model,"
*Phys. Rev. Lett.***83**, 2046 (1999). - "In-Plane Magnetic Field Effect on the Transport Properties in Quasi-3D Quantum Hall Structures,''
*Phys. Rev. B***60**, 8743 (1999). - "Instabilities Toward Charge Density Wave and Paired Quantum Hall State of Half-Filled Landau Levels," cond-mat/9911265 (1999).
- "Conductance Correlations Near Quantum Hall Transitions,''
*Phys. Rev. Lett.***81**, 2767 (1998). - "Quantization and Chiral Edge State Properties in Nearly 3D Quantum Hall Structures,"
*Physica B*, 258, 279 (1998). - "Nonabelian Chiral Anomaly in the Integer Quantum Hall Effect,"
*Phys. Rev. Lett.***81**, 1747 (1998). - "Conductance, Conductance Fluctuations, and Level Statistics on the Surface of Multilayer Quantum Hall States,"
*Phys. Rev. B***58**, 1967 (1998). - "Localization and Metal-Insulator Transition in Multilayer Quantum Hall Structures,"
*Phys. Rev. Lett.***79**, 4002 (1997). - "Weakly Coupled Antiferromagnetic Quantum Spin Chains,''
*Phys. Rev. Lett.***78**, 126 (1997). - "Critical Conductance and Its Fluctuations at Integer Quantum Hall Plateau Transitions,''
*Phys. Rev. Lett.***77**, 4426 (1996). - "The Effects of Electron-Electron Interactions on the Integer Quantum Hall Transitions,''
*Phys. Rev. Lett.***76**, 4014 (1996). - "Transitions Between Hall Plateaus and the Dimerization Transition of a Hubbard Chain,''
*Philos. Mag. Lett.***73**, 145 (1996). - "Phase Transitions in the Symmetric Kondo Lattice Model in Two and Three Dimensions,''
*Phys. Rev. B***51**, R15630 (1995). - "Scaling theory of the Hall Coefficient Near the Metal-Insulator Transition: A Renormalization Group Approach,"
*Nucl. Phys. B [PS]***415**, 589 (1994);*Physica B***199**&**200**, 463 (1994). - "Transitions Between Hall Plateaus in the Presence of Strong Landau Level Mixing,"
*Phys. Rev. Lett.***72**, 2454 (1994). - "Spin Triplet Solitons in the One-Dimensional Symmetric Kondo Lattice,"
*Phys. Rev. B***47**, 11935 (1993). - "Quantum Percolation and the Plateau Transitions in the Quantum Hall Effect,''
*Phys. Rev. Lett.***70**, 4130 (1993). - "Collective Excitations, Photoemission Spectra and Optical Gaps in Strongly Correlated Fermi Systems,"
*Phys. Rev. Lett.***69**, 2009 (1992). - "Strongly Correlated Fermi Liquid and the Unbroken Symmetry Phase of the High-Tc Superconductors,"
*Int. J. Mod. Phys. B***6**(5&6), 603 (1992). - "Critical Behavior of the Hall Coefficient Near the Mobility Edge,"
*Phys. Rev. Lett.***68**, 2504 (1992). - "The Fermi Liquid Phase of the
*t-J*Model and the Hall Coefficient in High-Tc Superconductors,"*Phys. Rev. Lett.***68**, 2078 (1992). - "Collective Excitations and Spectral Function in the Fermi Liquid State of the
*t-J*Model,"*Phys. Rev. Lett.***67**, 2733 (1991). - "Pairing in Two Dimensions: A Systematic Approach,"
*Phys. Rev. B***43**, 10229 (1991).