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- Finite-momentum condensate of magnetic excitons in a bilayer quantum Hall system
- Universidade Estadual Paulista (UNESP)
- Univ Utrecht
- Universidade Estadual de Campinas (UNICAMP)
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Netherlands Organization for Scientific Research (NWO)
- FAPESP: 10/00479-6
- FAPESP: 07/57630-5
- CNPq: 303073/2010-1
- 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.
- Physical Review B. College Pk: Amer Physical Soc, v. 86, n. 3, p. 17, 2012.
- Amer Physical Soc
- Acesso restrito
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