Observation of Shapiro steps in an ultracold atomic Josephson junction
成果类型：
Article
署名作者：
Bernhart, Erik; Rohrle, Marvin; Singh, Vijay Pal; Mathey, Ludwig; Amico, Luigi; Ott, Herwig
署名单位：
RPTU University Kaiserslautern; RPTU University Kaiserslautern; Technology Innovation Institute; University of Hamburg; University of Hamburg; University of Hamburg; University of Catania; Istituto Nazionale di Fisica Nucleare (INFN)
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-8075; 1095-9203
DOI：
10.1126/science.ads9061
发表日期：
2025-12-11
页码：
1130-1133
关键词：
摘要：
The current-voltage characteristic of a driven superconducting Josephson junction displays discrete steps. This phenomenon, called the Shapiro steps, forms today's voltage standard. In this work, we report the observation of Shapiro steps in a driven Josephson junction in a gas of ultracold atoms. We demonstrate that the steps exhibit universal features and provide insight into the microscopic dissipative dynamics that we directly observe in the experiment. We find that the steps are directly connected to phonon emission and nucleation of solitonic excitations, whose dynamics we follow in space and time. The experimental results are underpinned by extensive numerical simulations based on classical-field dynamics and may enable metrological and fundamental advances.
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