MANY-ELECTRON EXCITONS AND FERMI-EDGE SINGULARITIES IN WIDE, PARABOLIC (AL,GA)AS QUANTUM-WELLS

被引：17

作者：

FRITZE, M

CHEN, W

NURMIKKO, AV

JO, J

SANTOS, M

SHAYEGAN, M

机构：

[1] BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912

[2] PRINCETON UNIV,DEPT ELECT ENGN,PRINCETON,NJ 08544

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.45.8408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Wide n-type parabolic (Al,Ga)As quantum wells have been studied by use of magneto-optical techniques. Striking spectral features, reflective of many-electron-one-hole exciton effects, have been observed in these systems. These effects involve the Fermi-edge singularity phenomenon, now in a quasi-three-dimensional case. In this system, the closely spaced conduction subbands act as resonating channels for multiple electron-hole Coulomb scattering, allowing the singularity enhancement to influence the entire (shallow) Fermi sea. The photoluminescence spectra show pronounced enhancements at high energy (near E(F)) in addition to prominent subband exciton peaks despite the presence of an electron Fermi sea. Applied magnetic fields show subband depopulation effects as well as strong, periodic enhancements whenever the Fermi level is in near resonance with a higher subband.

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收藏

页码：8408 / 8412

页数：5

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