Fermi-edge singularities in photoluminescence from modulation-doped GaAs quantum wells

被引：18

作者：

Brown, SA

Young, JF

Wasilewski, Z

Coleridge, PT

机构：

[1] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER,BC,CANADA

[2] NATL RES COUNCIL CANADA,INST MICROSTRUCT SCI,OTTAWA,ON,CANADA

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.56.3937

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed a detailed study of low-temperature photoluminescence (PL) from a pair of modulation-doped GaAs/AlxGa1-xAs multiple-quantum-well samples finding weak Fermi-edge singularities (FES's) associated with both heavy-hole and light-hole subbands. In contrast to previous experiments it appears that the presence of the FES's is not due to hole localization or the proximity of a second electronic subband. The many body enhancement above the single particle background is found to be comparable to that in systems with localized holes. The enhancement of the PL spectrum is significantly stronger than that of the absorption spectra from the same samples. Comparison with previously published data suggests that this asymmetry may be a general property of two-dimensional electron systems.

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收藏

页码：3937 / 3940

页数：4

相关论文

共 28 条

[1] EXCITONS IN THE QUASI-2-DIMENSIONAL ELECTRON-GAS [J].

BAUER, GEW .

PHYSICAL REVIEW B, 1992, 45 (16) :9153-9162

[2] VIRTUAL EXCITATION OF THE FERMI-EDGE SINGULARITY IN MODULATION-DOPED QUANTUM-WELLS [J].

BRENER, I ;

KNOX, WH ;

SCHAEFER, W .

PHYSICAL REVIEW B, 1995, 51 (03) :2005-2008

[3] Evolution of the interband absorption threshold with the density of a two-dimensional electron gas [J].

Brown, SA ;

Young, JF ;

Brum, JA ;

Hawrylak, P ;

Wasilewski, Z .

PHYSICAL REVIEW B, 1996, 54 (16) :11082-11085

[4]

BRUM JA, 1996, SURF SCI, V361, P648

[5] INTERACTION OF MAGNETOEXCITONS AND 2-DIMENSIONAL ELECTRON-GAS IN THE QUANTUM HALL REGIME [J].

CHEN, W ;

FRITZE, M ;

NURMIKKO, AV ;

ACKLEY, D ;

COLVARD, C ;

LEE, H .

PHYSICAL REVIEW LETTERS, 1990, 64 (20) :2434-2437

[6] ELECTRONIC STATES AND OPTICAL-TRANSITIONS IN MODULATION-DOPED N-TYPE GAXIN1-XAS ALXIN1-XAS MULTIPLE QUANTUM WELLS [J].

CINGOLANI, R ;

STOLZ, W ;

PLOOG, K .

PHYSICAL REVIEW B, 1989, 40 (05) :2950-2955

[7] INFRARED CATASTROPHY AND EXCITONS IN X-RAY-SPECTRA OF METALS [J].

COMBESCOT, M ;

NOZIERES, P .

JOURNAL DE PHYSIQUE, 1971, 32 (11-1) :913-+

[8] MANY-BODY EFFECTS IN A MODULATION-DOPED SEMICONDUCTOR QUANTUM-WELL [J].

DELALANDE, C ;

BASTARD, G ;

ORGONASI, J ;

BRUM, JA ;

LIU, HW ;

VOOS, M ;

WEIMANN, G ;

SCHLAPP, W .

PHYSICAL REVIEW LETTERS, 1987, 59 (23) :2690-2692

[9] FERMI-ENERGY EDGE SINGULARITY AND EXCITONIC ENHANCEMENT ASSOCIATED WITH THE 2ND SUBBAND IN ASYMMETRIC MODULATION-DOPED QUANTUM-WELLS [J].

FISHER, TA ;

SIMMONDS, PE ;

SKOLNICK, MS ;

MARTIN, AD ;

SMITH, RS .

PHYSICAL REVIEW B, 1993, 48 (19) :14253-14263

[10] OPTICAL-PROPERTIES OF A 2-DIMENSIONAL ELECTRON-GAS - EVOLUTION OF SPECTRA FROM EXCITONS TO FERMI-EDGE SINGULARITIES [J].

HAWRYLAK, P .

PHYSICAL REVIEW B, 1991, 44 (08) :3821-3828