Ultrafast acoustic phonon ballistics in semiconductor heterostructures

被引：60

作者：

Baumberg, JJ ^{[1
]}

Williams, DA ^{[1
]}

Kohler, K ^{[1
]}

机构：

[1] FRAUNHOFER INST APPL SOLID STATE PHYS, D-79108 FREIBERG, GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.78.3358

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a two-color ultrafast surface deflection spectroscopy, we demonstrate the time-resolved observation of acoustic phonon wave packets emitted from a single buried GaAs quantum well. A longitudinal acoustic phonon pulse is generated at a preselected depth within a highly confined region (greater than or equal to 10 nm thick) through the coherent nonequilibrium deformation potential which was previously unobserved in such structures. Subsequent detection with subpicosecond resolution at the surface resolves propagating high-wave-vector ballistic phonons sind quasiballistic or "snake" phonons which subsequently merge into a quasidiffusive phonon pulse.

引用

页码：3358 / 3361

页数：4

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