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A New Approach to the Study of Bose‐Einstein Condensation of Biexcitons
Author(s) -
Hasuo M.,
Nagasawa N.,
Mysyrowicz A.
Publication year - 1992
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.2221730125
Subject(s) - biexciton , bose–einstein condensate , condensation , phase (matter) , physics , materials science , condensed matter physics , exciton , quantum mechanics , thermodynamics
A new method is described that allows to detect the presence of a Bose condensate of biexcitons in a direct band gap material. It probes the accumulation of biexcitons in the coherent k = 0 state by measuring the increase of the optical phase conjugation signal of a crystal simultaneously pumped by an intense incoherent pump source. Experimental verification of the method is achieved in CuCl at low temperature. Results show an increase of the k = 0 biexciton mode occupation number by at least 8.6 × 10 5 when the randomly injected biexciton density exceeds the critical value for Bose condensation.