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Low‐temperature excitons produced by two‐photon excitation in high‐purity diamond crystals
Author(s) -
Naka N.,
Kitamura T.,
Omachi J.,
KuwataGonokami M.
Publication year - 2008
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.200879877
Subject(s) - exciton , excitation , diamond , photon , atomic physics , laser , crystal (programming language) , electron , two photon excitation microscopy , molecular physics , condensed matter physics , materials science , chemistry , physics , optics , quantum mechanics , computer science , programming language , composite material
We have observed edge emission due to free excitons and electron–hole droplets in diamond by two‐photon excitation using subpicosecond laser pulses at 257 nm. We find that excitonic temperatures under two‐photon excitation are much lower than the case of one‐photon excitation. A minimum excitonic temperature of 3.4 K is extracted by spectral analysis. In order to understand the difference of the excitonic temperatures under two‐photon and one‐photon excitations, we discuss a heating mechanism which depends on the density distribution of the electron–hole pairs in the crystal along the laser beam. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)