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Degenerate electron gas effects in the modulation spectroscopy of pseudomorphic Al0.32Ga0.68As/In0.15Ga 0.85As/GaAs high electron mobility transistor structures

Dimoulas, A, Zekentes, K, Androulidaki, M, Kornelios, N, Michelakis, C and Hatzopoulos, Z (1993) Degenerate electron gas effects in the modulation spectroscopy of pseudomorphic Al0.32Ga0.68As/In0.15Ga 0.85As/GaAs high electron mobility transistor structures Applied Physics Letters, 63 (10). pp. 1417-1419.

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Abstract

The effects of a degenerate two-dimensional electron gas on the interband optical excitations, occurring in the active channel of Al0.32Ga 0.68As/In0.15Ga0.85As/GaAs high electron mobility transistor structures, were investigated by using phototransmittance spectroscopy. The ground state transition at room temperature exhibited a characteristic steplike line shape, which was considered to be an effect of the screening of excitons by the degenerate electron gas. A line shape fitting by using a first derivative of the absorption coefficient with respect to the electron sheet concentration ns, allowed an estimation of the latter quantity by phototransmittance. An observed temperature-sensitive excitonlike signal, associated with the second electron subband was attributed to the modulation of the many-body correlation-enhanced excitonic absorption, known as the Fermi-edge singularity.

Item Type: Article
Authors :
NameEmailORCID
Dimoulas, AUNSPECIFIEDUNSPECIFIED
Zekentes, KUNSPECIFIEDUNSPECIFIED
Androulidaki, MUNSPECIFIEDUNSPECIFIED
Kornelios, NUNSPECIFIEDUNSPECIFIED
Michelakis, CUNSPECIFIEDUNSPECIFIED
Hatzopoulos, ZUNSPECIFIEDUNSPECIFIED
Date : 1 December 1993
Identification Number : https://doi.org/10.1063/1.109695
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:32
Last Modified : 17 May 2017 12:32
URI: http://epubs.surrey.ac.uk/id/eprint/835724

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