Realization of a Superleak in a Quantum Gas
Abstract
Ultracold quantum gases offer a controllable and microscopically accessible platform for understanding and engineering superfluidity. Yet, realizing a superleak that selectively transports the superfluid while suppressing normal flow has remained elusive. Here, we harness an optical superlattice to realize such a superleak through dynamical selectivity. The superfluid undergoes coherent Josephson transport, whereas the normal component exhibits slow, thermodynamically limited response, resulting in a flow-rate contrast of 500(49). Exploiting this contrast, we demonstrate repeated filtering of the normal component and dynamical purification of the superfluid, while sustaining coherent driven oscillations for up to 100 cycles. Our results establish a controllable atomic superleak and open possibilities for manipulating transport and thermodynamics in quantum fluids.
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BibTeX
@misc{yang2026realization,
title = {{Realization of a Superleak in a Quantum Gas}},
author = {Wan-Ling Yang and Shao-Bo Liu and Xiang Luo and Chao Yang and Hai-Lin Li and Yu-Zhou Yang and Yong-Kui Wang and Bing Yang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.31185},
eprint = {2610.31185},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.31185},
}
RIS
TY - UNPB
TI - Realization of a Superleak in a Quantum Gas
AU - Wan-Ling Yang
AU - Shao-Bo Liu
AU - Xiang Luo
AU - Chao Yang
AU - Hai-Lin Li
AU - Yu-Zhou Yang
AU - Yong-Kui Wang
AU - Bing Yang
PY - 2026
DA - 2026/10/22
PB - arXiv
DO - 10.48550/arxiv.2610.31185
UR - https://arxiv.org/abs/2610.31185
AB - Ultracold quantum gases offer a controllable and microscopically accessible platform for understanding and engineering superfluidity. Yet, realizing a superleak that selectively transports the superfluid while suppressing normal flow has remained elusive. Here, we harness an optical superlattice to realize such a superleak through dynamical selectivity. The superfluid undergoes coherent Josephson transport, whereas the normal component exhibits slow, thermodynamically limited response, resulting in a flow-rate contrast of 500(49). Exploiting this contrast, we demonstrate repeated filtering of the normal component and dynamical purification of the superfluid, while sustaining coherent driven oscillations for up to 100 cycles. Our results establish a controllable atomic superleak and open possibilities for manipulating transport and thermodynamics in quantum fluids.
ER -