Quantum and classical ratchet motions of vortices in a 2D trigonal superconductor

Abstract

Dynamical behavior of vortices plays central roles in the quantum phenomena of two-dimensional (2D) superconductors. Quantum metallic state, for example, showing an anomalous temperature-independent resistive state down to low-temperatures, has been a common subject in recently developed 2D crystalline superconductors, whose microscopic origin is still under debate. Here, we unveil a new aspect of the vortex dynamics in a noncentrosymmetric 2D crystalline superconductor of MoS${}_2$ through the nonreciprocal transport measurement. The second harmonic resistance $R^{2w}$ at low temperature with high current indicates the classical vortex flow accompanying the ratchet motion. Furthermore, we found that $R^{2w}$ is substantially suppressed in the quantum metallic state with low current region, allowing identification of the quantum and classical ratchet motions of vortices by the magnitude of the second harmonic generation. This suggests that nonreciprocal transport measurement can be a powerful tool to probe the vortex dynamics in noncentrosymmetric 2D superconductors.

arXiv comment23 pages, 6 figures

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• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Anomalous superconducting diode effect in a polar superconductor
• Field-free superconducting diode effect and magnetochiral anisotropy in FeTe0.7Se0.3 junctions with the inherent asymmetric barrier
• Vortex entropy and superconducting fluctuations in ultrathin underdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ superconductor
• Dynamical vortex phase diagram of 2D superconductivity in gated MoS2
• Gate-tunable giant superconducting nonreciprocal transport in few-layer $T_{\mathrm{d}}$-MoTe${}_2$
• Phase diagram of superconducting vortex ratchet motion in a superlattice with noncentrosymmetry
• Crossover from Conventional to Unconventional Superconductivity in 2M-WS2
• Picosecond Trajectory of Two-dimensional Vortex Motion in FeSe${}_{0.5}$Te${}_{0.5}$ Visualized by Terahertz Second Harmonic Generation
• Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling
• Microwave Microscope Studies of Trapped Vortex Dynamics in Superconductors
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