Collective excitations in realistic quantum wires

Arne Brataas*, A. G. Mal'shukov, Vidar Gudmundsson, K. A. Chao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We have used the Hartree-Fock random phase approximation to study the interacting electron gas in a quantum wire. The spectra of intersubband spin-flip excitations reveal a considerable red shift with respect to single-particle Hartree-Fock energies. That signals the appearance of collective intersubband spin-density excitations due to the exchange interaction. The long-wavelength dispersions of the intrasubband collective spin-density excitations are linear but the sound velocities are renormalized due to the exchange interaction and screening. The in-phase intrasubband charge-density excitation has the long-wavelength form q[-ln(q)]1/2. We found good qualitative agreement of our results with experimental observations.

Original languageEnglish
Pages (from-to)L325-L330
JournalJournal of Physics Condensed Matter
Volume8
Issue number23
DOIs
Publication statusPublished - 3 Jun 1996

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