Interaction-driven topological and nematic phases on the Lieb lattice
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 topologica...
| Egile Nagusiak: | , , , |
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| Beste egile batzuk: | |
| Formatua: | Artikulua |
| Hizkuntza: | en_US |
| Argitaratua: |
IOP Publishing
2015
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| Sarrera elektronikoa: | http://hdl.handle.net/1721.1/98378 https://orcid.org/0000-0002-9236-7410 |
| Gaia: | 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. |
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