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Emission properties from dense exciton gases in diamond
Author(s) -
Okushi Hideyo,
Watanabe Hideyuki,
Yamasaki Satoshi,
Kanno Shokichi
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200671410
Subject(s) - diamond , cathodoluminescence , exciton , chemical vapor deposition , condensation , spectral line , semiconductor , thermal equilibrium , emission spectrum , atomic physics , chemistry , materials science , condensed matter physics , luminescence , nanotechnology , physics , optoelectronics , thermodynamics , organic chemistry , astronomy
A systematic study of cathodoluminescence (CL) emission arising from free exciton recombination in diamond is given. CL spectra of free exciton emission from diamond under high excitation conditions were used to characterize properties of ultradense exciton gases at quasi‐thermal equilibrium. Theoretical spectra of excitonic emission from diamond were calculated based on Bose–Einstein (BE) statistics, taking into account collision of excitons in an indirect semiconductor like diamond. The calculated spectra agreed well with the observed spectra over a wide temperature range for high‐quality homoepitaxial chemical vapor deposition diamond thin films. The analysis showed that a high density of excitons of over 10 18 cm −3 could be achieved under thermodynamic quasi‐equilibrium by continuous electron beam excitation, at which BE condensation can be expected at low temperature. These results indicate that diamond is a perfect material for the generation and detection of BE condensation which is the most characteristic features of BE statistics. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)