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首页> 外文期刊>Physical review >Using acoustic waves to induce high-frequency current oscillations in superlattices
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Using acoustic waves to induce high-frequency current oscillations in superlattices

机译：使用声波在超晶格中感应高频电流振荡

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摘要

We show that gigahertz acoustic waves in semiconductor superlattices can induce terahertz (THz) electron dynamics that depend critically on the wave amplitude. Below the threshold amplitude, the acoustic wave drags electrons through the superlattice with a peak drift velocity overshooting that produced by a static electric field. In this regime, single electrons perform drifting orbits with THz frequency components. When the wave amplitude exceeds the critical threshold, an abrupt onset of Bloch-type oscillations causes negative differential velocity. The acoustic wave also affects the collective behavior of the electrons by causing the formation of localized electron accumulation and depletion regions, which propagate through the superlattice, thereby producing self-sustained current oscillations even for very small wave amplitudes. We show that the underlying single-electron dynamics, in particular, the transition between the acoustic wave dragging and Bloch oscillation regimes, strongly influence the spatial distribution of the electrons and the form of the current oscillations. In particular, the amplitude of the current oscillations depends nonmonotonically on the strength of the acoustic wave, reflecting the variation in the single-electron drift velocity.
机译：我们表明，半导体超晶格中的千兆赫兹声波可以诱导太赫兹（THz）电子动力学，而该动力学主要取决于波幅。低于阈值振幅，声波将电子拖过超晶格，其峰值漂移速度超过了由静电电场产生的漂移速度。在这种情况下，单电子以太赫兹频率分量执行漂移轨道。当波幅超过临界阈值时，Bloch型振荡的突然发生会导致负速度差。声波还通过引起局部电子累积和耗尽区的形成来影响电子的集体行为，该局部电子累积和耗尽区通过超晶格传播，从而即使在非常小的波幅下也产生自持的电流振荡。我们表明，潜在的单电子动力学，特别是声波拖曳和布洛赫振荡态之间的过渡，强烈影响电子的空间分布和电流振荡的形式。特别地，电流振荡的幅度非单调地取决于声波的强度，反映了单电子漂移速度的变化。

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