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Type: Artigo de periódico
Title: Finite-momentum condensate of magnetic excitons in a bilayer quantum Hall system
Author: Doretto, RL
Smith, CM
Caldeira, AO
Abstract: 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.
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 86, n. 3, 2012.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.86.035326
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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