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QUaNtUM siMUlatiON Characterizing transport in a quantum gas by measuring Drude weights Philipp Schüttelkopf1*, Mohammadamin Tajik1,2,3, Nataliia Bazhan1, Federica Cataldini1, Si- Cong Ji1, Jörg Schmiedmayer1, Frederik Møller1* 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. …
摘自《科学》(Science)第391卷 第6782期 · 2026年1月15日。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。