论文标题
夏皮罗（Shapiro
Shapiro steps in charge-density-wave states driven by ultrasound
论文作者
论文摘要
我们表明，超声可以在电荷密度波（CDW）状态下诱导Shapiro步骤（SS）。当应用带有频率$ω$和直流电压的超声波电压时，SS以当前$ i $ $ $ \ propto $ $ $nΩ$带有整数$ n $。 SS的均匀倍数由CDW和超声之间的两个耦合表示。尽管具有频率$ω$的交流电压偏置以$ i \ propto tonΩ$诱导SS，但超声偏置比偶数偏置更强烈地增强了奇数。这是超声和交流电压之间的差异。由于SS在$ DV/DI $中引起突然的峰值，因此$ i $ -V $曲线的极端变化将应用于非常敏感的超声检测器。
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.
