Nonlocality in the two-dimensional plasmon dispersion.
Nonlocality in the two-dimensional plasmon dispersion.
复制标题
二维等离子体色散中的非定域性。
DOI：
10.1103/physrevlett.54.2367
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发表时间：
1985
影响因子：
8.6
通讯作者：
Ploog
中科院分区：
文献类型：
--
作者：
Batke;Heitmann;Kotthaus;Ploog
用透射谱研究了AlGaAs-GaAs异质结中的二维等离激元。在磁场B中，我们观察到等离子体激发与回旋共振频率ωc=eBm的谐波的相互作用，这是由二维等离子体激发的非局域效应引起的，并且受参数(q v Fωc)2(q是等离子体波矢；v F是费米速度)的控制。组合共振的色散和激发强度与准经典非局域理论有很好的定量一致性。
Two-dimensional plasmons have been investigated in AlGaAs-GaAs heterostructures with transmission spectroscopy. In a magnetic field B, we observe an interaction of the plasmon excitation with harmonics of the cyclotron-resonance frequency ω c= eB m, which arises from nonlocal effects on the two-dimensional-plasmon excitation and is governed by the parameter (q v F ω c) 2 (q is the plasmon wave vector; v F is the Fermi velocity). The dispersion and the excitation strengths of the combined resonances are in excellent quantitative agreement with a quasiclassical nonlocal theory.