Interplay of noise and reservoir-induced decoherence in persistent currents
Abstract
Persistent current is a hallmark of quantum phase coherence. We study the fate of the persistent current in a nonequilibrium setting, where a tight-binding ring is subjected to stochastic disorder as well as a fermionic reservoir attached to each site. We evaluate the current using the Keldysh technique and find that it exhibits nonmonotonic behavior, suggesting two distinct mechanisms of decoherence. While coupling to the reservoirs introduces a coherence length scale given by the inverse of the coupling strength, the other mechanism is more subtle and driven by the ratio of noise strength to reservoir coupling. The interplay of noise and reservoir constitutes a purely nonequilibrium steady state with a flatter distribution function that we effectively describe using classical rate equations. We also discuss possibilities of realizing our findings in ultracold-atom experiments.
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BibTeX
@article{sur2026interplay,
title = {{Interplay of noise and reservoir-induced decoherence in persistent currents}},
author = {Samudra Sur and Thierry Giamarchi},
journal = {Physical Review Research},
year = {2026},
month = nov,
doi = {10.1103/486b-4qgc},
url = {https://doi.org/10.1103/486b-4qgc},
note = {CC BY},
}
RIS
TY - JOUR
TI - Interplay of noise and reservoir-induced decoherence in persistent currents
AU - Samudra Sur
AU - Thierry Giamarchi
PY - 2026
DA - 2026/11/09
JO - Physical Review Research
DO - 10.1103/486b-4qgc
UR - https://doi.org/10.1103/486b-4qgc
AB - Persistent current is a hallmark of quantum phase coherence. We study the fate of the persistent current in a nonequilibrium setting, where a tight-binding ring is subjected to stochastic disorder as well as a fermionic reservoir attached to each site. We evaluate the current using the Keldysh technique and find that it exhibits nonmonotonic behavior, suggesting two distinct mechanisms of decoherence. While coupling to the reservoirs introduces a coherence length scale given by the inverse of the coupling strength, the other mechanism is more subtle and driven by the ratio of noise strength to reservoir coupling. The interplay of noise and reservoir constitutes a purely nonequilibrium steady state with a flatter distribution function that we effectively describe using classical rate equations. We also discuss possibilities of realizing our findings in ultracold-atom experiments.
SN - 2643-1564
ER -