Abstract
Non-equilibrium electron distributions as well as phonon dynamics in wurtzite GaN have been measured by subpicosecond time-resolved Raman spectroscopy. Our experimental results have demonstrated that for electron densities n ≥ 5 × l0 17cm -3, the non-equilibrium electron distributions in wurtzite GaN can be very well described by Fermi-Dirac distribution functions with the temperature of electrons substantially higher than that of the lattice. 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 (1) one transverse optical phonon and one high energy, longitudinal or transverse acoustical phonons; and (2) one transverse optical phonon and one E 2 phonon.
| Original language | English (US) |
|---|---|
| Title of host publication | Materials Research Society Symposium - Proceedings |
| Editors | F.A. Ponce, T.D. Moustakas, I. Akasaki, B.A. Monemar |
| Publisher | Materials Research Society |
| Pages | 737-742 |
| Number of pages | 6 |
| Volume | 449 |
| State | Published - 1997 |
| Event | Proceedings of the 1996 MRS Fall Symposium - Boston, MA, USA Duration: Dec 2 1996 → Dec 6 1996 |
Other
| Other | Proceedings of the 1996 MRS Fall Symposium |
|---|---|
| City | Boston, MA, USA |
| Period | 12/2/96 → 12/6/96 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
Cite this
Subpicosecond time-resolved roman studies of nonequilibrium excitations in wurtzite GaN. / Tsen, Kong-Thon; Joshi, R. P.; Ferry, D. K.; Botchkarev, A.; Sverdlov, B.; Salvador, A.; Morkoc, H.
Materials Research Society Symposium - Proceedings. ed. / F.A. Ponce; T.D. Moustakas; I. Akasaki; B.A. Monemar. Vol. 449 Materials Research Society, 1997. p. 737-742.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Subpicosecond time-resolved roman studies of nonequilibrium excitations in wurtzite GaN
AU - Tsen, Kong-Thon
AU - Joshi, R. P.
AU - Ferry, D. K.
AU - Botchkarev, A.
AU - Sverdlov, B.
AU - Salvador, A.
AU - Morkoc, H.
PY - 1997
Y1 - 1997
N2 - Non-equilibrium electron distributions as well as phonon dynamics in wurtzite GaN have been measured by subpicosecond time-resolved Raman spectroscopy. Our experimental results have demonstrated that for electron densities n ≥ 5 × l0 17cm -3, the non-equilibrium electron distributions in wurtzite GaN can be very well described by Fermi-Dirac distribution functions with the temperature of electrons substantially higher than that of the lattice. 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 (1) one transverse optical phonon and one high energy, longitudinal or transverse acoustical phonons; and (2) one transverse optical phonon and one E 2 phonon.
AB - Non-equilibrium electron distributions as well as phonon dynamics in wurtzite GaN have been measured by subpicosecond time-resolved Raman spectroscopy. Our experimental results have demonstrated that for electron densities n ≥ 5 × l0 17cm -3, the non-equilibrium electron distributions in wurtzite GaN can be very well described by Fermi-Dirac distribution functions with the temperature of electrons substantially higher than that of the lattice. 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 (1) one transverse optical phonon and one high energy, longitudinal or transverse acoustical phonons; and (2) one transverse optical phonon and one E 2 phonon.
UR - http://www.scopus.com/inward/record.url?scp=0030677104&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030677104&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0030677104
VL - 449
SP - 737
EP - 742
BT - Materials Research Society Symposium - Proceedings
A2 - Ponce, F.A.
A2 - Moustakas, T.D.
A2 - Akasaki, I.
A2 - Monemar, B.A.
PB - Materials Research Society
ER -