Two-subband system in quantizing magnetic field: Probing many-body gap by non-equilibrium phonons

Details Two-subband system in quantizing magnetic field: Probing many-body gap by non-equilibrium phonons Two-subband system in quantizing magnetic field: Probing many-body gap by non-equilibrium phonons

2001-11-20

arxiv.org/abs/cond-mat/0111377v1

Physica E 15, 202 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 3 figures

Scientific paper

10.1016/S1386-9477(02)00554-4

We study the many-body effects in a two-subband quasi-two-dimensional electron system in a quantizing magnetic field at filling factor three. A manifestation of these effects in the phonon absorption spectroscopy is discussed. The electron system is mapped onto a two-level system with the separation between levels determined by the intersubband splitting and the cyclotron energy. The electron-electron interaction enhances the excitation gap, which exists at all values of the interlevel splitting. This results in a single-peak structure of the phonon absorption rate as a function of magnetic field, instead of the double-peak structure for non-interacting electrons.

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