Interplay between disorder and intersubband collective excitations in the two-dimensional electron gas

Details Interplay between disorder and intersubband collective excitations in the two-dimensional electron gas Interplay between disorder and intersubband collective excitations in the two-dimensional electron gas

2001-05-22

arxiv.org/abs/cond-mat/0105434v1

Physics

Condensed Matter

5 pages, 4 figures, RevTeX. Accepted for publication in Phys. Rev. B (Rapid. Comm.)

Scientific paper

10.1103/PhysRevB.64.041306

Intersubband absorption in modulation-doped quantum wells is usually appropriately described as a collective excitation of the confined two-dimensional electron gas. At sufficiently low electron density and low temperatures, however, the in-plane disorder potential is able to damp the collective modes by mixing the intersubband charge-density excitation with single-particle localized modes. Here we show experimental evidence of this transition. The results are analyzed within the framework of the density functional theory and highlight the impact of the interplay between disorder and the collective response of the two-dimensional electron gas in semiconductor heterostructures.

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