Temperature-driven gapless topological insulator
arXiv:1808.00978 · doi:10.1103/PhysRevLett.122.126601
Abstract
We investigate the phase diagram of the Haldane-Falicov-Kimball model -- a model combining topology, interactions and spontaneous disorder at finite temperatures. Using an unbiased numerical method, we map out the phase diagram on the interaction--temperature plane. Along with known phases, we unveil an \textit{insulating charge ordered state with gapless excitations }and a temperature-driven \textit{gapless topological insulating} phase. Intrinsic -- temperature generated -- disorder, is the key ingredient explaining the unexpected behavior. Our findings support the possibility of having temperature-driven topological phase transitions into gapped and gapless topological insulating phases in systems with a large mass unbalance in fermionic species.
arXiv comment5 pages, 4 figures
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