Shapiro spikes in driven quantum fluids
Abstract
Periodic driving of a Josephson junction produces resonant transport signatures known as Shapiro spikes, conventionally described by effective circuit models. Here, we demonstrate Shapiro spikes in a neutral quantum fluid using simulations of a potential-biased atomic Josephson junction. The dc-current resonances follow the expected Bessel-function scaling, including the suppression and revival of individual resonances with increasing modulation strength. We uncover their microscopic mechanism by showing that the phase-winding frequency develops finite plateaus at integer multiples of the drive frequency. These phase-locked states are sustained by quantized-vortex nucleation and the associated 2π phase slips. Remarkably, within a locking plateau, the dc current and density transfer can reverse direction while the phase-winding frequency remains locked to the drive, giving rise to negative-mobility transport. Our results establish a microscopic link between vortex-mediated phase slips, Shapiro resonances, and anomalous transport in a neutral quantum fluid, revealing how quantized vortices convert resonant transport into phase-locked dynamics with negative mobility.
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BibTeX
@misc{singh2026shapiro,
title = {{Shapiro spikes in driven quantum fluids}},
author = {Vijay Pal Singh and Ludwig Mathey and Luigi Amico},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.05477},
eprint = {2611.05477},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.05477},
}
RIS
TY - UNPB
TI - Shapiro spikes in driven quantum fluids
AU - Vijay Pal Singh
AU - Ludwig Mathey
AU - Luigi Amico
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2611.05477
UR - https://arxiv.org/abs/2611.05477
AB - Periodic driving of a Josephson junction produces resonant transport signatures known as Shapiro spikes, conventionally described by effective circuit models. Here, we demonstrate Shapiro spikes in a neutral quantum fluid using simulations of a potential-biased atomic Josephson junction. The dc-current resonances follow the expected Bessel-function scaling, including the suppression and revival of individual resonances with increasing modulation strength. We uncover their microscopic mechanism by showing that the phase-winding frequency develops finite plateaus at integer multiples of the drive frequency. These phase-locked states are sustained by quantized-vortex nucleation and the associated 2π phase slips. Remarkably, within a locking plateau, the dc current and density transfer can reverse direction while the phase-winding frequency remains locked to the drive, giving rise to negative-mobility transport. Our results establish a microscopic link between vortex-mediated phase slips, Shapiro resonances, and anomalous transport in a neutral quantum fluid, revealing how quantized vortices convert resonant transport into phase-locked dynamics with negative mobility.
ER -