Collective Excitations in Realistic Quantum Wires

Details Collective Excitations in Realistic Quantum Wires Collective Excitations in Realistic Quantum Wires

1996-05-06

arxiv.org/abs/cond-mat/9605031v1

Physics

Condensed Matter

7 pages, 1 encapsulated postscript figure, uses IOP style files, to appear in the Journal of Physics: Condensed Matter as a Le

Scientific paper

10.1088/0953-8984/8/23/002

We have used the Hartree-Fock Random Phase Approximation (HF-RPA) 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 HF energies. That signals on appearance of collective intersubband spind-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 renormalised 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.

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