Artigo
Temperature-induced spontaneous time-reversal symmetry breaking on the honeycomb lattice
Registro en:
Physical Review Letters, v. 114, n. 17, p. 1-16, 2015.
0031-9007
10.1103/PhysRevLett.114.176402
WOS:000353684400011
Autor
Liu, Wei
Punnoose, Alexander [UNESP]
Resumen
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. CUNY City Coll, Dept Phys, New York, NY 10031 USA Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, Brazil Univ Estadual Paulista, Instituto de Física Teórica (IFT), BR-01140070 Sao Paulo, SP, Brazil