Shapiro steps in charge-density-wave states driven by ultrasound
Michiyasu Mori, Sadamichi Maekawa
Abstract
We show that ultrasound can induce Shapiro steps (SSs) in a charge-density-wave (CDW) state. When ultrasound with frequency ω and a dc voltage are applied, the SSs occur at the current I ∝nω with an integer n. Even and odd multiples of SSs are represented by two couplings between the CDW and ultrasound. Although an ac voltage bias with frequency ω induces the SSs at I∝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 SSs cause abrupt peaks in the dV/dI, the extreme changes in the I–V curve will be applied to a very sensitive ultrasound detector.
Topics & Concepts
OmegaPhysicsUltrasoundVoltageBiasingCharge density waveCharge (physics)Integer (computer science)Atomic physicsCondensed matter physicsSuperconductivityQuantum mechanicsAcousticsProgramming languageComputer scienceQuantum and electron transport phenomenaOrganic and Molecular Conductors ResearchMechanical and Optical Resonators