Thermodynamic studies of spin-1/2 Falicov-Kimball model (FKM) on a triangular lattice

Kumar, Sant; Yadav, Umesh K.; Maitra, T.; Singh, Ishwar

doi:10.1063/1.4947619

Cited by 3 publications

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“…The melting of the CDW state with increasing T was observed for commensurate fillings [15][16][17][18]. On the triangular lattice the FKM and its extensions display a variety of different ground-state phases [19][20][21][22][23]. For incommensurate fillings the FKM favors phase separation [5].…”

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confidence: 99%

Classical and Quantum Liquids Induced by Quantum Fluctuations

2019

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Geometrically frustrated interactions may render classical ground-states macroscopically degenerate. The connection between classical and quantum liquids and how the degeneracy is affected by quantum fluctuations is, however, not completely understood. We study a simple model of coupled quantum and classical degrees of freedom, the so-called Falicov-Kimball model, on a triangular lattice and away from half-filling. For weak interactions the phase diagram features a charge disordered state down to zero temperature. We provide compelling evidence that this phase is a liquid and show that it is divided by a crossover line that terminates in a quantum critical point. Our results offer a new vantage point to address how quantum liquids can emerge from their classical counterparts.

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