Heavy-light hole quantum beats in the band-to-band continuum of GaAs observed in 20 femtosecond pump-probe experiments

被引：58

作者：

Joschko, M

Woerner, M

Elsaesser, E

Binder, E

Hey, R

Kostial, H

Ploog, K

机构：

[1] UNIV STUTTGART,INST THEORET PHYS,D-70569 STUTTGART,GERMANY

[2] PAUL DRUDE INST FESTKORPERELEKT,D-10117 BERLIN,GERMANY

[3] UNIV MUNSTER,INST THEORET PHYS 2,D-48149 MUNSTER,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.78.737

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Coherent polarizations in the band-to-band continuum of bulk GaAs are studied in pump-probe experiments with 20 fs pulses. For the first time, we observe quantum beats on a 100 fs time scale that are due to an impulsively excited quantum coherence between heavy and light hole states. The beat frequency is determined by the heavy-light hole energy splitting changing continuously with the energy separation between the laser and the band gap. Theoretical calculations of the coherent response based on the semiconductor Bloch equations for a three-band scheme account for the data.

引用

页码：737 / 740

页数：4

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