| Texto completo | |
| Autor(es): |
Doretto, R. L.
;
Smith, C. Morais
;
Caldeira, A. O.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 86, n. 3, p. 17-pg., 2012-07-26. |
| Resumo | |
We study the bilayer quantum Hall system at total filling factor nu(T) = 1 within a bosonization formalism which allows us to approximately treat the magnetic exciton as a boson. We show that in the region where the distance between the two layers is comparable to the magnetic length, the ground state of the system can be seen as a finite-momentum condensate of magnetic excitons provided that the excitation spectrum is gapped. We analyze the stability of such a phase within the Bogoliubov approximation first assuming that only one momentum Q is macroscopically occupied and later we consider the same situation for two modes +/- Q. We find strong evidences that a first-order quantum phase transition at small interlayer separation takes place from a zero-momentum condensate phase, which corresponds to Halperin 111 state, to a finite-momentum condensate of magnetic excitons. (AU) | |
| Processo FAPESP: | 07/57630-5 - Métodos não perturbativos aplicados a sistemas eletrônicos correlacionados |
| Beneficiário: | Eduardo Miranda |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 10/00479-6 - Sistemas magnéticos bidimensionais |
| Beneficiário: | Ricardo Luis Doretto |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |