Observation of large many-body Coulomb interaction effects in a doped quantum wire

Details Observation of large many-body Coulomb interaction effects in a doped quantum wire Observation of large many-body Coulomb interaction effects in a doped quantum wire

2002-04-14

arxiv.org/abs/cond-mat/0204301v1

Solid State Commun 122, 169-173 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, RevTeX, to be published in Solid State Communications

Scientific paper

10.1016/S0038-1098(02)00093-5

We demonstrate strong one dimensional (1-D) many-body interaction effects in photoluminescence (PL) in a GaAs single quantum wire of unprecedented optical quality, where 1-D electron plasma densities are controlled via electrical gating. We observed PL of 1-D charged excitons with large binding energy of 2.3 meV relative to the neutral excitons, and its evolution to a Fermi-edge singularity at high electron density. Furthermore, we find a strong band-gap renormalization in the 1-D wire, or a large red-shift of PL with increased electron plasma density. Such a large PL red-shift is not observed when we create a high density neutral electron-hole plasma in the same wire, due probably to cancellation of the Coulomb interaction energy in the neutral plasma.

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