Coherent phonon dynamics in short-period InAs/GaSb superlattices

被引：3

作者：

Noe, G. T. ^{[1
,2
,3
]}

Haugan, H. J. ^{[4
]}

Brown, G. J. ^{[4
]}

Sanders, G. D. ^{[5
]}

Stanton, C. J. ^{[5
]}

Kono, J. ^{[1
,2
,3
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[3] Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA

[4] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[5] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

SUPERLATTICES AND MICROSTRUCTURES | 2012年 / 52卷 / 06期

基金：

美国国家科学基金会;

关键词：

InAs/GaSb type-II superlattices; Coherent phonons; Infrared detectors; ACOUSTIC PHONONS; OSCILLATION;

D O I：

10.1016/j.spmi.2012.08.010

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have performed ultrafast pump-probe spectroscopy studies on a series of InAs/GaSb-based short-period superlattice (SL) samples with periods ranging from 46 angstrom to 71 angstrom. We observe two types of oscillations in the differential reflectivity with fast (similar to 1-2 ps) and slow (similar to 24 ps) periods. The period of the fast oscillations changes with the SL period and can be explained as coherent acoustic phonons generated from carriers photoexcited within the SL. This mode provides an alternative method for determining the SL period. The period of the slow mode depends on the wavelength of the probe pulse and can be understood as a propagating coherent phonon wavepacket modulating the reflectivity of the probe pulse as it travels from the surface into the sample. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：1071 / 1077

页数：7

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