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

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

2003-07-30

arxiv.org/abs/cond-mat/0307722v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; conference: EP2DS-15

Scientific paper

10.1016/j.physe.2003.11.215

Excitation spectra in bilayer quantum Hall systems at total Landau-level filling $\nu=2$ 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.

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