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Helical Metal Inside a Topological Band Insulator
Ying Ran, Yi Zhang, Ashvin Vishwanath
Topological defects, such as domain walls and vortices, have long fascinated physicists. A novel twist is added in quantum systems like the B-phase of superfluid helium He, whe…
Extended supersolid phase of frustrated hard-core bosons on a triangular lattice
Fa Wang, Frank Pollmann, Ashvin Vishwanath
We study a model of hard-core bosons with frustrated nearest-neighbor hopping () and repulsion () on the triangular lattice. We argue for a supersolid ground state in the lar…
Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
Fa Wang, Hui Zhai, Ying Ran +2
We apply the fermion functional renormalization group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure…
A direct transition between a Neel ordered Mott insulator and a superconductor on the square lattice
Ying Ran, Ashvin Vishwanath, Dung-Hai Lee
In this paper we study a bandwidth-controlled direct, continuous, phase transition from a Mott insulator, with easy plane Neel order, to a fully gapped superconductor…
A Z spin-orbital liquid state in the square lattice Kugel-Khomskii model
Fa Wang, Ashvin Vishwanath
We argue for the existence of a liquid ground state in a class of square lattice models of orbitally degenerate insulators. Starting with the SU(4) symmetric Kugel-Khomskii model,…
Comparative study of Higgs transition in one-component and two-component lattice superconductor models
Olexei I. Motrunich, Ashvin Vishwanath
Using Monte Carlo simulations, we study a Higgs transition in several three-dimensional lattice realizations of the noncompact CP model (NCCP), a gauge theory with two comp…