Premium
Conditions and possible mechanism of condensation of e–h pairs in bulk GaAs at room temperature
Author(s) -
Vasil'ev Peter P.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301989
Subject(s) - electron , condensed matter physics , boson , pairing , condensation , coherence (philosophical gambling strategy) , atomic physics , conduction band , photon , physics , density of states , chemistry , superconductivity , quantum mechanics , thermodynamics
A mechanism of the condensation of e–h pairs in bulk GaAs at room temperature, which has been observed earlier, is proposed. The point is that the photon assisted pairing happens in a system of electrons and holes that occupy energy levels at the very bottoms of the bands. Due to a very high e–h density, the destruction of the pairs and loss of coherence does not occur because almost all energy levels inside a 30–60 meV band from the bottom of the conduction band prove to be occupied. As a result, a coherent ensemble of composite bosons (paired electrons and holes) with the minimum possible energy appears. The lifetime of this strongly non‐equilibrium coherent e–h BCS‐like state is as short as a few hundred of femtoseconds. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)