Coupled two-layer plasmon modes induced in a single quantum well by in-plane magnetic fields

Shun-Jen Cheng*, Rolf R. Gerhardts

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We present a complete investigation of the collective excitations in quantum wells subject to in-plane magnetic fields B, based on the random phase approximation and self-consistently calculated ground states in the Hartree approximation. We find that, for a symmetric quantum well of width w, high in-plane B fields (lB≪w) can, besides the usual optical intrasubband plasmons (OP's), give rise to an additional branch of undamped acoustic plasmons (AP's), which does not exist in a single well without B. In low B fields (lB≪w), the magnetic-field broken symmetry of electron wave functions causes an anticrossing feature of the plasmon dispersions even in the symmetric well. In intermediate B fields (lB≪w), an unusual anisotropy effect occurs: the number of the plasmon branches depends on the angle between the magnetic field and the in-plane plasmon wave vector q. For B∥q, there exist two branches of plasmons (OP's and AP's), whereas only one (OP) exists for B⊥q.

Original languageEnglish
Article number085307
Pages (from-to)1-10
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number8
DOIs
StatePublished - 15 Feb 2002

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