COHERENT TRANSIENT CYCLOTRON EMISSION FROM PHOTOEXCITED GAAS

被引：36

作者：

SOME, D ^{[1
]}

NURMIKKO, AV ^{[1
]}

机构：

[1] BROWN UNIV,CTR ADV MAT RES,PROVIDENCE,RI 02912

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.50.5783

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Femtosecond photoexcitation near, but above, the band gap in GaAs epitaxial layers and doped heterostructures in magnetic fields is shown to produce transient coherent cyclotron emission, lasting for several picoseconds at low temperatures. This emission reflects the relatively long phase relaxation of coherent electronic excitations associated with free electron inter-Landau-level transitions. In a doped, wide parabolic quantum well, the photoexcited carriers drive the magnetoplasmon mode of the equilibrium carriers, producing a dramatic resonance as the cyclotron frequency crosses the magnetoplasmon frequency.

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页码：5783 / 5786

页数：4

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