Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
OPEN ACCESS
Loading...
Author / Producer
Date
2021-04
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
We study thermoelectric currents of neutral, fermionic atoms flowing through a mesoscopic channel connecting a hot and a cold reservoir across the superfluid transition. The thermoelectric response results from a competition between density-driven diffusion from the cold to the hot reservoir and the channel favoring transport of energetic particles from hot to cold. We control the relative strength of both contributions to the thermoelectric response using an external optical potential in a nearly noninteracting and a strongly interacting system. Without interactions, the magnitude of the particle current can be tuned over a broad range but is restricted to flow from hot to cold in our parameter regime. Strikingly, strong interparticle interactions additionally reverse the direction of the current. We quantitatively model ab initio the noninteracting observations and qualitatively explain the interaction-assisted reversal by the reduction of entropy transport due to pairing correlations. Our work paves the way to studying the coupling of spin and heat in strongly correlated matter using spin-dependent optical techniques with cold atoms.
Permanent link
Publication status
published
Editor
Book title
Journal / series
Volume
11 (2)
Pages / Article No.
21034
Publisher
American Physical Society
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Organisational unit
03599 - Esslinger, Tilman / Esslinger, Tilman
Notes
Funding
182650 - Interplay between Topology, Interactions and Dissipation in Driven Quantum Many-Body Systems (SNF)
742579 - Mass, heat and spin transport in interlinked quantum gases (EC)
746150 - Topological states with Spin-Dependent potentials for ultracold lithium (EC)
742579 - Mass, heat and spin transport in interlinked quantum gases (EC)
746150 - Topological states with Spin-Dependent potentials for ultracold lithium (EC)
Related publications and datasets
Is supplemented by: https://doi.org/10.3929/ethz-b-000487773