SUPPRESSION OF GROUND-STATE OPTICAL RECOMBINATION IN THE QUANTUM HALL REGIME

被引：40

作者：

DAHL, M

HEIMAN, D

PINCZUK, A

GOLDBERG, BB

PFEIFFER, LN

WEST, KW

机构：

[1] MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139

[2] AT&T BELL LABS,MURRAY HILL,NJ 07974

[3] BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.45.6957

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The time evolution of optical recombination in the two-dimensional electron gas in GaAs/(Ga,Al)As heterostructures shows an anomalous increase at the Landau-level filling factor nu = 1. Here we find that the radiative recombination rate is slowed by an order of magnitude and is commensurate with the quantum Hall effect. The inhibited electron-hole recombination is caused by localization and changes in the screening response of the electron gas, which leads to reduced electron-hole overlap and broadening of the density of states. These mechanisms are also manifest in a large increase in hole relaxation time at nu = 1.

引用

页码：6957 / 6960

页数：4

共 12 条

[1]

BASTARD G, 1988, WAVE MECH APPL SEMIC, P273

[2] MAGNETOOPTICAL EVIDENCE FOR FRACTIONAL QUANTUM HALL STATES DOWN TO FILLING FACTOR 1/9 [J].