Excitation Spectrum of a Double Quantum Well System

Details Excitation Spectrum of a Double Quantum Well System Excitation Spectrum of a Double Quantum Well System

1993-02-02

arxiv.org/abs/cond-mat/9302004v1

Prog.Theor.Phys. 100 (1998) 205-210

Physics

Condensed Matter

15pages

Scientific paper

10.1143/PTP.100.205

The collective charge-excitation spectrum of a double quantum well system in a strong magnetic field is obtained within the random phase approximation. Correction to the spectrum coming from the finiteness of the magnetic field is calculated up to the first order in inverse of the magnetic field. Dependencies on the magnetic field of (i) the velocity of long wave length excitation and (ii) the phase boundary of the quantum Hall state signaled by the softening of the roton minimum of the spectrum are discussed. Keywords: quantum Hall effect, two dimensional electrons, strong magnetic field, double quantum well, excitonic state

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