超声驱动下电荷密度波态的Shapiro台阶
Shapiro steps in charge-density-wave states driven by ultrasound
摘要：
我们发现，超声可以诱导Shapiro台阶（SS）的电荷密度波（CDW）状态。当施加频率为$ω$的超声和直流电压时，SS发生在电流为整数$n$的$I$ $\propto$ $nω$。SS的偶数倍和奇数倍由CDW和超声之间的两个耦合表示。虽然具有频率$ω$的交流电压偏置在$I\propto nω$处诱发SS，但是超声偏置比偶数倍更强烈地增强奇数倍。这是超声波和交流电压之间的差异。由于SS引起$dV/dI$中的突变峰，因此$I$ - $V$曲线中的极端变化将应用于非常灵敏的超声检测器。
英文摘要：
We show that ultrasound can induce the Shapiro steps (SS) in the charge-density-wave (CDW) state. When ultrasound with frequency $ω$ and a dc voltage are applied, the SS occur at the current $I$ $\propto$ $nω$ with integer $n$. Even and odd multiples of SS are represented by two couplings between the CDW and ultrasound. Although an ac voltage bias with frequency $ω$ induces the SS at $I\propto nω$, the ultrasound bias enhances the odd multiples more strongly than the even ones. This is the difference between the ultrasound and the ac voltage. Since the SS cause abrupt peaks in the $dV/dI$, the extreme changes in the $I$-$V$ curve will be applied to a very sensitive ultrasound detector.
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