Bloch oscillations in the presence of plasmons and phonons
Bloch oscillations in the presence of plasmons and phonons
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DOI：
10.1103/physrevlett.85.1084
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发表时间：
2000-07-31
影响因子：
8.6
通讯作者：
Wilkins, JW
中科院分区：
文献类型：
--
作者：
Ghosh, AW;Jönsson, L;Wilkins, JW
超晶格中布洛赫振荡电子和纵向光学声子之间的耦合导致共振声子激发，但布洛赫声子谱中没有间隙。此外。我们预测在 v(B) = 2v(p) 时从等离子体到布洛赫振荡的急剧转变。从现象学阻尼的微观描述出发，我们以数字方式绘制了各种参数下布洛赫-等离子体-声子耦合模式的行为，并模拟了实验条件。我们的结果与 Dekorsy 等人最近的实验非常一致。 [物理。莱特牧师。 85、1080 (2000)。
The coupling between Bloch oscillating electrons and longitudinal optical phonons in a superlattice leads to resonant phonon excitation but no gap in the Bloch-phonon spectrum. In addition. we predict a sharp transition from plasma to Bloch oscillations at v(B) = 2v(p). From a microscopic description with phenomenological dampings, we numerically map out the behavior of coupled Bloch-plasmon-phonon modes for a wide range of parameters, and mimic experimental conditions. Our results are in good agreement with recent experiments by Dekorsy et al. [Phys. Rev. Lett. 85, 1080 (2000).