Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 29: Ultra-cold Atoms, Ions and BEC III (joint session A/Q)

A 29.7: Talk

Thursday, March 14, 2024, 16:00–16:15, HS 1010

Fermi-liquid-like thermal and spin diffusion between unitary superfluids by dissipation — •Meng-Zi Huang, Philipp Fabritius, Jeffrey Mohan, Mohsen Talebi, Simon Wili, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland

Dissipation engineering in strongly correlated systems is an emerging territory of nontrivial interplay between coherent and incoherent dynamics. With direct particle and entropy measurements in a two-terminal setting, we show that the Seebeck response of a strongly-interacting Fermi gas can be enhanced by particle dissipation. This enhancement is robust when changing the dimensionality of the connection between the reservoirs and even the nature of the dissipation mechanisms, namely from spin-selective to pairwise losses. The dissipation also enhances thermal diffusion and spin diffusion, restoring the Fermi-liquid thermal and spin conductance which is initially strongly suppressed in this non-Fermi liquid. Although a microscopic theory is still missing, we provide a phenomenological model that can describe the observations.

Keywords: Superfluid transport; Dissipation engineering; strongly-interacting fermions