Details

Autor(en) / Beteiligte

• Tsai, Wei-Feng
• Fang, Chen
• Yao, Hong
• Hu, Jiangping

Titel

Interaction-driven topological and nematic phases on the Lieb lattice

Ist Teil von

• New journal of physics, 2015-05, Vol.17 (5), p.55016

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2015

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.