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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Finite-momentum condensate of magnetic excitons in a bilayer quantum Hall system

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Doretto, R. L. [1] ; Smith, C. Morais [2] ; Caldeira, A. O. [3]
Total Authors: 3
[1] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo - Brazil
[2] Univ Utrecht, Inst Theoret Phys, NL-3584 CE Utrecht - Netherlands
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review B; v. 86, n. 3 JUL 26 2012.
Web of Science Citations: 5

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)

FAPESP's process: 10/00479-6 - Two-dimensional magnetic systems
Grantee:Ricardo Luis Doretto
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 07/57630-5 - Non-perturbative methods applied to strongly correlated electronic systems
Grantee:Eduardo Miranda
Support type: Research Projects - Thematic Grants