Dynamics of Bloch-oscillations in semiconductor superlattices: direct determination of the displacement

被引：0

作者：

Sudzius, M ^{[1
]}

Lyssenko, VG ^{[1
]}

Loser, F ^{[1
]}

Valusis, G ^{[1
]}

Hasche, T ^{[1
]}

Leo, K ^{[1
]}

Dignam, MM ^{[1
]}

Kohler, K ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany

来源：

ULTRAFAST PHENOMENA IN SEMICONDUCTORS II | 1998年 / 3277卷

关键词：

superlattice; Wannier-Stark ladder; Bloch oscillations; wave packet displacement;

D O I：

10.1117/12.306142

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We investigate the spatial displacement dynamics of optically excited wave packets in semiconductor superlattices. A short laser pulse exciting semiconductor superlattice induces quantum beats between different excitonic states that in turn leads to formation of a time-varying coherent wave packet. The real space oscillation of the excited wave packet identifies these quantum beats of the Wannier-Stark states as Bloch oscillations: We present an experimental technique which measures directly the displacement of the wave packet center-of-mass. The oscillating Bloch wave packets create a microscopic dipole moment which can be detected using the shift of the Wannier-Stark ladder transition energy as a sensitive field detector. We show that the Bloch wave packet undergoes harmonic spatial motion, Proing for the first time the predictions of Bloch and Zener. The influence of an experimental conditions on displacement of the Bloch wave packet is discussed.

引用

页码：88 / 95

页数：8