Temperature-induced spontaneous time-reversal symmetry breaking on the honeycomb lattice
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2015-04-30
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Liu, Wei
Punnoose, Alexander [UNESP]
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Phase transitions involving spontaneous time-reversal symmetry breaking are studied on the honeycomb lattice at finite hole doping with next-nearest-neighbor repulsion. We derive an exact expression for the mean-field equation of state in closed form, valid at temperatures much less than the Fermi energy. Contrary to standard expectations, we find that thermally induced intraband particle-hole excitations can create and stabilize a uniform metallic phase with broken time-reversal symmetry as the temperature is raised in a region where the ground state is a trivial metal.
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Physical Review Letters, v. 114, n. 17, 2015.