Controlling and enhancing terahertz collective electron dynamics in superlattices by chaos-assisted miniband transport
Controlling and enhancing terahertz collective electron dynamics in superlattices by chaos-assisted miniband transport
复制标题
通过混沌辅助微带传输控制和增强超晶格中的太赫兹集体电子动力学
DOI：
10.1103/physrevb.80.205318
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发表时间：
2009
影响因子：
3.7
通讯作者：
T. Fromhold
中科院分区：
文献类型：
--
作者：
M. Greenaway;A. Balanov;Eckehard Schöll;T. Fromhold
我们发现，倾斜磁场改变了偏置半导体超晶格中电荷畴的结构和太赫兹动力学。在临界场值下，微带电子的布洛赫和回旋运动之间的强耦合触发了电子轨道的混沌离域，导致其漂移速度的强烈共振增强。这通过诱导多个传播电荷域和频率比没有倾斜场高十倍的GHz-THz电流振荡来显著影响集体电子行为。
We show that a tilted magnetic field transforms the structure and THz dynamics of charge domains in a biased semiconductor superlattice. At critical field values, strong coupling between the Bloch and cyclotron motion of a miniband electron triggers chaotic delocalization of the electron orbits, causing strong resonant enhancement of their drift velocity. This dramatically affects the collective electron behavior by inducing multiple propagating charge domains and GHz-THz current oscillations with frequencies ten times higher than with no tilted field.