We report I–V curves of quasi one-dimensional charge-density wave (CDW) conductors under simultaneous impacts of rf voltage at two frequencies, F and f, with F ≫ f. We find that each Shapiro step (ShS) induced by F-irradiation behaves as a “host” surrounded with “satellites” induced by f-irradiation, e.g., by ShSs at the CDW currents corresponding to F ± f. The subharmonic “hosts” are surrounded with subharmonic “satellites,” e.g., by ShSs at the CDW currents corresponding to F/2 ± f/2. The hosts and satellites show oscillations of their widths as a function of rf amplitude. We demonstrate that each satellite can be treated as a conventional ShS, if its host ShS is taken as a reference point at which the CDW is resting. Thus, with the help of rf irradiation one can emulate CDW samples with tunable threshold voltages and extremely coherent sliding modes.
RF wave mixing with sliding charge-density waves
Note: This paper is part of the APL Special Collection on Charge-Density-Wave Quantum Materials and Devices.
S. A. Nikonov, S. G. Zybtsev, V. Ya. Pokrovskii; RF wave mixing with sliding charge-density waves. Appl. Phys. Lett. 21 June 2021; 118 (25): 253108. https://doi.org/10.1063/5.0051636
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