Bloch-phonon coupling and tunneling-induced coherent phonon excitation in semiconductor superlattices -: art. no. 085305

被引：10

作者：

Först, M

Kurz, H

Dekorsy, T

Leavitt, RP

机构：

[1] Rhein Westfal TH Aachen, Inst Halbleitertech, D-52074 Aachen, Germany

[2] Forschungszentrum Rossendorf EV, Inst Ionenstrahlphys & Mat Forsch, D-01314 Dresden, Germany

[3] USA, Res Lab, Adelphi, MD 20783 USA

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.67.085305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The coupling of Bloch oscillations to longitudinal optical phonons is investigated in a narrow-well In0.53Ga0.47As/In0.52Al0.48As superlattice. A strong increase of coherent phonon amplitudes is observed when the Bloch oscillations are subsequently tuned into resonance with different optical phonon modes. The rapid dephasing of the Bloch oscillations due to field induced tunneling from the weakly bound miniband into above-barrier continuum states leads to an additional and new excitation process of coherent phonons in superlattices at high electric fields. Polarization dependent measurements confirm their generation via Coulomb interaction excluding any contribution through impulsively stimulated Raman scattering.

引用

页数：4

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