Shahbazyan TV, Primozich N, Perakis IE, Chemla DS. Femtosecond coherent dynamics of the fermi-edge singularity and exciton hybrid.
PHYSICAL REVIEW LETTERS 2000;
84:2006-2009. [PMID:
11017682 DOI:
10.1103/physrevlett.84.2006]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/1999] [Indexed: 05/23/2023]
Abstract
We study theoretically the coherent nonlinear optical response of doped quantum wells with several subbands. When the Fermi energy approaches the exciton level of an upper subband, the absorption spectrum acquires a characteristic double-peak shape originating from the interference between the Fermi-edge singularity and the exciton resonance. We demonstrate that, for off-resonant pump excitation, the pump-probe spectrum undergoes a striking transformation, with a time-dependent exchange of oscillator strength between the Fermi-edge singularity and exciton peaks. This effect originates from the many-body electron-hole correlations which determine the dynamical response of the Fermi sea.
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