Premium
Study of Anomalous Excitonic Transport in Cu 2 O
Author(s) -
Benson E.,
Fortin E.,
Mysyrowicz A.
Publication year - 1995
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.2221910211
Subject(s) - exciton , superfluidity , condensed matter physics , degenerate energy levels , physics , condensation , bose–einstein condensate , wave packet , biexciton , atomic physics , quantum mechanics , thermodynamics
An experimental study of excitonic transport in Cu 2 O is presented. Excitons are detected several mm away from their initial location, via the photovoltaic effect. Results at low exciton densities are well explained by a diffusive motion. However, at high densities, anomalous transport, in the form of excitonic packets propagating at constant speed, is observed. Threshold conditions for the onset of ballistic packet motion are determined as a function of lattice temperature and exciton densities. They are consistent with requirements for Bose‐Einstein condensation of excitons. Double pulse experiments reveal an important attraction of low density probe particles towards a packet. The packet is suggested to correspond to the superfluid component of a quantum degenerate ecxitonic fluid.