Excitonic instabilities and spontaneous time-reversal symmetry breaking on the honeycomb lattice
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
---|---|
Data(s) |
03/12/2014
03/12/2014
16/01/2014
|
Resumo |
We elucidate the close relationship between spontaneous time-reversal symmetry breaking and the physics of excitonic instabilities in strongly correlated multiband systems. The underlying mechanism responsible for the spontaneous breaking of time-reversal symmetry in a many-body system is closely related to the Cooper-like pairing instability of interband particle-hole pairs involving higher-order symmetries. Studies of such pairing instabilities have, however, mainly focused on the mean-field aspects of the virtual exciton condensate, which ignores the presence of the underlying collective Fermi-liquid excitations. We show that this relationship can be exploited to systematically derive the coupling of the condensate order parameter to the intraband Fermi-liquid particle-hole excitations. Surprisingly, we find that the static susceptibility is negative in the ordered phase when the coupling to the Fermi-liquid collective excitations are included, suggesting that a uniform condensate of virtual excitons, with or without time-reversal breaking, is an unstable phase at T = 0. |
Formato |
8 |
Identificador |
http://dx.doi.org/10.1103/PhysRevB.89.045126 Physical Review B. College Pk: Amer Physical Soc, v. 89, n. 4, 8 p., 2014. 1098-0121 http://hdl.handle.net/11449/113011 10.1103/PhysRevB.89.045126 WOS:000332221400003 WOS000332221400003.pdf |
Idioma(s) |
eng |
Publicador |
Amer Physical Soc |
Relação |
Physical Review B |
Direitos |
closedAccess |
Tipo |
info:eu-repo/semantics/article |