Nonequilibrium thermal state of a voltage-biased Mott insulator
arXiv:2009.04533 · doi:10.1103/PhysRevB.105.075149
Abstract
We establish the nonequilibrium thermal phases of a voltage driven antiferromagnetic Mott insulator in three dimensions, realised at steady state under a voltage bias. Starting from the Keldysh action for the half filled Hubbard model we derive an effective Langevin equation for the `slow' magnetic variables. The coupling of electrons to these degrees of freedom determine the transport properties. At low temperature we find a voltage-driven discontinuous insulator-metal transition, along with hysteresis. We map the suppression of the Néel temperature and pseudogap temperature with increasing voltage, and discover that the biased Mott insulator has a finite temperature insulator-metal transition. The low temperature results resolve an experimental puzzle about hysteresis, and the thermal results make testable predictions on spectra and nonlinear transport.
arXiv comment12 pages, 11 figures. Supplement 5 pages, 1 figure
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