Characterizing transport in a quantum gas by measuring Drude weights

• 成果类型: Article
• 署名作者: Schuttelkopf, Philipp; Tajik, Mohammadamin; Bazhan, Nataliia; Cataldini, Federica; Ji, Si-Cong; Schmiedmayer, Jorg; Moller, Frederik
• 署名单位: Technische Universitat Wien; California Institute of Technology; Max Planck Society
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.ads8327
• 发表日期: 2026-01-15
• 页码: 290-293
• 关键词: CONDUCTION; SCATTERING

摘要

Transport properties define materials as insulators, metals, or superconductors. A fundamental parameter is the Drude weight, which quantifies the ballistic transport of charge carriers. In this study, we measured the Drude weights of an ultracold gas of interacting bosonic atoms confined to one dimension, characterizing atomic and energy currents induced by applying a constant force and by joining two subsystems prepared in different equilibrium states. We demonstrate dissipationless transport, even in the presence of interactions and finite temperature, signifying ballistic propagation of conserved quantities corresponding to lowest-order hydrodynamics. Our approach provides a robust and transparent framework for characterizing transport in strongly correlated quantum matter, applicable in regimes where theory remains incomplete.