Nonequilibrium dynamics in a quasi-two-dimensional electron plasma after ultrafast intersubband excitation

被引:59
作者
Lutgen, S
Kaindl, RA
Woerner, M
Elsaesser, T
Hase, A
Kunzel, H
Gulia, M
Meglio, D
Lugli, P
机构
[1] HEINRICH HERTZ INST NACHRICHTENTECH BERLIN GMBH,D-10587 BERLIN,GERMANY
[2] UNIV MODENA,INFM,DIPARTIMENTO FIS,I-4100 MODENA,ITALY
[3] UNIV ROMA TOR VERGATA,INFM,DIPARTIMENTO INGN ELETTRON,I-00133 ROME,ITALY
关键词
D O I
10.1103/PhysRevLett.77.3657
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The dynamics of electrons in GaTnAs/ALlnAs quantum wells is studied after excitation from the n = 1 to the n = 2 conduction subband. Femtosecond pump-probe experiments demonstrate for the first time athermal distributions of n = 1 electrons on a surprisingly long time scale of 2 ps. Thermalization involves intersubband scattering of excited electrons via optical phonon emission with a time constant of 1 ps and intrasubband Coulomb and phonon scattering. Ensemble Monte Carlo simulations show that the slow electron equilibration results from Pauli blocking and screening of carrier-carrier scattering.
引用
收藏
页码:3657 / 3660
页数:4
相关论文
共 15 条
[1]  
[Anonymous], 1992, Hot carriers in semiconductor nanostructures, DOI DOI 10.1016/B978-0-08-092570-7.50012-X
[2]   INITIAL THERMALIZATION OF PHOTOEXCITED CARRIERS IN GAAS STUDIED BY FEMTOSECOND LUMINESCENCE SPECTROSCOPY [J].
ELSAESSER, T ;
SHAH, J ;
ROTA, L ;
LUGLI, P .
PHYSICAL REVIEW LETTERS, 1991, 66 (13) :1757-1760
[3]   MEASUREMENT OF THE INTERSUBBAND SCATTERING RATE IN SEMICONDUCTOR QUANTUM-WELLS BY EXCITED-STATE DIFFERENTIAL ABSORPTION-SPECTROSCOPY [J].
FAIST, J ;
CAPASSO, F ;
SIRTORI, C ;
SIVCO, DL ;
HUTCHINSON, AL ;
CHU, SNG ;
CHO, AY .
APPLIED PHYSICS LETTERS, 1993, 63 (10) :1354-1356
[4]   QUANTUM CASCADE LASER [J].
FAIST, J ;
CAPASSO, F ;
SIVCO, DL ;
SIRTORI, C ;
HUTCHINSON, AL ;
CHO, AY .
SCIENCE, 1994, 264 (5158) :553-556
[5]   EFFECT OF ELECTRON-ELECTRON SCATTERING ON NONEQUILIBRIUM TRANSPORT IN QUANTUM-WELL SYSTEMS [J].
GOODNICK, SM ;
LUGLI, P .
PHYSICAL REVIEW B, 1988, 37 (05) :2578-2588
[6]   FEMTOSECOND INTERSUBBAND RELAXATION IN GAAS QUANTUM-WELLS [J].
HUNSCHE, S ;
LEO, K ;
KURZ, H ;
KOHLER, K .
PHYSICAL REVIEW B, 1994, 50 (08) :5791-5794
[7]   FEMTOSECOND CARRIER THERMALIZATION IN DENSE FERMI SEAS [J].
KNOX, WH ;
CHEMLA, DS ;
LIVESCU, G ;
CUNNINGHAM, JE ;
HENRY, JE .
PHYSICAL REVIEW LETTERS, 1988, 61 (11) :1290-1293
[8]   MICROSCOPIC CALCULATION OF THE ELECTRON OPTICAL-PHONON INTERACTION IN ULTRATHIN GAAS/ALXGA1-XAS ALLOY QUANTUM-WELL SYSTEMS [J].
LEE, I ;
GOODNICK, SM ;
GULIA, M ;
MOLINARI, E ;
LUGLI, P .
PHYSICAL REVIEW B, 1995, 51 (11) :7046-7057
[9]  
LUGLI P, 1992, SEMICOND SCI TECH, V7, pB166
[10]   SUBPICOSECOND SPECTRAL HOLE BURNING DUE TO NON-THERMALIZED PHOTOEXCITED CARRIERS IN GAAS [J].
OUDAR, JL ;
HULIN, D ;
MIGUS, A ;
ANTONETTI, A ;
ALEXANDRE, F .
PHYSICAL REVIEW LETTERS, 1985, 55 (19) :2074-2077