Interaction-driven topological and nematic phases on the Lieb lattice
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Tsai-2015-Interaction-driven t.pdf
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Author(s)
Tsai, Wei-Feng
Fang, Chen
Yao, Hong
Hu, Jiangping
Date Issued
May 2015
Journal
New Journal of Physics
Publisher
IOP Publishing
Citation
Tsai, Wei-Feng, Chen Fang, Hong Yao, and Jiangping Hu. “Interaction-Driven Topological and Nematic Phases on the Lieb Lattice.” New J. Phys. 17, no. 5 (May 1, 2015): 055016. © 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1088/1367-2630/17/5/055016
