Spin-squeezed ground states in the bilayer quantum Hall ferromagnet

T. Nakajima, H. Aoki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

A “squeezed-vacuum” state considered in quantum optics is shown to be realized in the ground-state wave function for the bilayer quantum Hall system at the total Landau-level filling of (Formula presented) ((Formula presented) is an odd integer). This is derived in the boson approximation, where a particle-hole pair creation across the symmetric-antisymmetric gap, (Formula presented) is regarded as a boson. In terms of the pseudospin describing the layers, the state is a spin-squeezed state, where the degree of squeezing is controlled by the layer separation and (Formula presented). An exciton condensation, which amounts to a rotated spin-squeezed state, has a higher energy due to the degraded SU(2) symmetry for (Formula presented).

Original languageEnglish
Pages (from-to)R15549-R15552
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number24
DOIs
Publication statusPublished - 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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