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Subpicosecond Time‐Resolved Raman Studies of Non‐Equilibrium Excitations in Wide Bandgap GaN
Author(s) -
Tsen K. T.,
Joshi R. P.,
Ferry D. K.
Publication year - 1997
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 - 10.1002/1521-3951(199711)204:1<106::aid-pssb106>3.0.co;2-e
Subject(s) - phonon , raman spectroscopy , wurtzite crystal structure , transverse plane , condensed matter physics , materials science , relaxation (psychology) , spectroscopy , band gap , molecular physics , physics , optics , quantum mechanics , psychology , social psychology , structural engineering , engineering , diffraction
Non‐equilibrium phonon dynamics in wurtzite GaN have been studied by subpicosecond time‐resolved Raman spectroscopy. The population relaxation time of longitudinal optical phonons was directly measured to be τ ≅ (5 ± 1) ps at T = 25 K. The experimental results on the temperature dependence of the lifetime of longitudinal optical phonons suggest that the primary decay channels for these phonons are the decay into (i) one transverse optical phonon and one high energy, longitudinal or transverse acoustical phonons; and (ii) one transverse optical phonon and one E 2 phonon.