Interaction-driven topological and nematic phases on the Lieb lattice
Strongly Correlated Electrons
2015-05-18 v2 Mesoscale and Nanoscale Physics
Abstract
We show that topological states are often developed in two dimensional semimetals with quadratic band crossing points (BCPs) by electron-electron interactions. To illustrate this, we construct a concrete model with the BCP on an extended Lieb lattice and investigate the interaction-driven topological instabilities. We find that the BCP is marginally unstable against infinitesimal repulsions. Depending on the interaction strengths, topological quantum anomalous/spin Hall, charge nematic, and nematic-spin-nematic phases, develop separately. Possible physical realizations of quadratic BCPs are provided.
Keywords
Cite
@article{arxiv.1112.5789,
title = {Interaction-driven topological and nematic phases on the Lieb lattice},
author = {Wei-Feng Tsai and Chen Fang and Hong Yao and JiangPing Hu},
journal= {arXiv preprint arXiv:1112.5789},
year = {2015}
}
Comments
14 pages, 14 figures, published version