Phonoconductivity measurement of the phonon absorption by a two-dimensional hole gas in a GaAs heterojunction.
Phonoconductivity measurement of the phonon absorption by a two-dimensional hole gas in a GaAs heterojunction.
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GaAs 异质结中二维空穴气体的声子吸收的声导测量。
DOI：
10.1103/physrevb.54.2019
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Henini
中科院分区：
文献类型：
--
作者：
Kent;Strickland;Henini
在本文中，我们描述了 GaAs/Al x Ga 1− x As 异质结中二维 (2D) 空穴气体对弹道热脉冲中声声子吸收的测量。使用声导技术，检测由声子吸收引起的器件电阻的变化。通过这种方法可以获得有关异质结中空穴-声子相互作用的直接信息。测量了零磁场和量子化磁场中的声导率，并将其与吸收数值计算的结果进行了比较。尽管二维空穴子带和空穴-声子耦合的复杂性，我们发现，在这些实验的空穴密度和温度下，描述二维电子与声子相互作用的理论可以合理地应用于二维空穴，适当改变有效质量和其他相关参数，并使用单一有效价带变形势。利用我们的结果，我们能够确定受限孔的 Fang-Howard 参数以及自旋分裂最低子带中重孔的有效质量。© 1996 美国物理学会。
In this paper we describe measurements of the absorption of acoustic phonons from a ballistic heat pulse by a two-dimensional (2D) hole gas in a GaAs/Al x Ga 1− x As heterojunction. The phonoconductivity technique was used, in which the change in the resistance of a device caused by phonon absorption is detected. Direct information regarding the hole-phonon interaction in a heterojunction is obtained by this method. Measurements of the phonoconductivity in zero and quantizing magnetic fields were made and compared with the results of numerical calculations of the absorption. In spite of the complicated nature of the 2D hole subbands and the hole-phonon coupling, we find that, at the hole densities and temperatures of these experiments, the theory describing the interaction of 2D electrons with phonons can be reasonably applied to 2D holes with the appropriate change of the effective mass and other relevant parameters, and the use of a single effective valence-band deformation potential. Using our results, we are able to determine the Fang-Howard parameter for the confined holes and the effective mass for heavy holes in the spin-split lowest subband.© 1996 The American Physical Society.