Quantum Spin Hall Insulators with Interactions and Lattice Anisotropy

Details Quantum Spin Hall Insulators with Interactions and Lattice Anisotropy Quantum Spin Hall Insulators with Interactions and Lattice Anisotropy

2011-06-06

arxiv.org/abs/1106.0943v1

Physics

Condensed Matter

Strongly Correlated Electrons

4+2 pages, 5+2 figures

Scientific paper

We investigate the interplay between spin-orbit coupling and electron-electron interactions on the honeycomb lattice combining the cellular dynamical mean-field theory and its real space extension with analytical approaches. We provide a thorough analysis of the phase diagram and temperature effects at weak spin-orbit coupling. We systematically discuss the stability of the quantum spin Hall phase towards interactions and lattice anisotropy resulting in the plaquette-honeycomb model. We also show the evolution of the helical edge states characteristic of quantum spin Hall insulators as a function of Hubbard interaction and anisotropy. At very weak spin-orbit coupling and intermediate electron-electron interactions, we substantiate the existence of a quantum spin liquid phase.

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