Excitation spectrum of Bilayer $ν=2$ Quantum Hall Systems

Yuichi Shimoda; Tatsuya Nakajima; Anju Sawada

doi:10.1016/j.physe.2003.11.215

paper

Excitation spectrum of Bilayer $ν = 2$ Quantum Hall Systems

arXiv:cond-mat/0307722 · doi:10.1016/j.physe.2003.11.215

Abstract

Excitation spectra in bilayer quantum Hall systems at total Landau-level filling $ν = 2$ are studied by the Hartree-Fock-Bogoliubov approximation. The systems have the spin degrees of freedom in addition to the layer degrees of freedom described in terms of pseudospin. On the excitation spectra from spin-unpolarized and pseudospin-polarized ground state, this approximation fully preserves the spin rotational symmetry and thus can give not only spin-triplet but also spin-singlet excitations systematically. It is also found that the ground-state properties are well described by this approximation.

5 pages, 3 figures; conference: EP2DS-15

Excitation spectrum of Bilayer ν=2 Quantum Hall Systems

Abstract

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Excitation spectrum of Bilayer $ν = 2$ Quantum Hall Systems