Interaction-Assisted Reversal of Thermopower with Ultracold Atoms

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...

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Autores principales:	Samuel Häusler, Philipp Fabritius, Jeffrey Mohan, Martin Lebrat, Laura Corman, Tilman Esslinger
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/c816d46fc5414c6fbd3f27ea33233eee
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spelling	oai:doaj.org-article:c816d46fc5414c6fbd3f27ea33233eee2021-12-02T14:41:43ZInteraction-Assisted Reversal of Thermopower with Ultracold Atoms10.1103/PhysRevX.11.0210342160-3308https://doaj.org/article/c816d46fc5414c6fbd3f27ea33233eee2021-05-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021034http://doi.org/10.1103/PhysRevX.11.021034https://doaj.org/toc/2160-3308We 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.Samuel HäuslerPhilipp FabritiusJeffrey MohanMartin LebratLaura CormanTilman EsslingerAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021034 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Samuel Häusler Philipp Fabritius Jeffrey Mohan Martin Lebrat Laura Corman Tilman Esslinger Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
description	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.
format	article
author	Samuel Häusler Philipp Fabritius Jeffrey Mohan Martin Lebrat Laura Corman Tilman Esslinger
author_facet	Samuel Häusler Philipp Fabritius Jeffrey Mohan Martin Lebrat Laura Corman Tilman Esslinger
author_sort	Samuel Häusler
title	Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
title_short	Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
title_full	Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
title_fullStr	Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
title_full_unstemmed	Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
title_sort	interaction-assisted reversal of thermopower with ultracold atoms
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/c816d46fc5414c6fbd3f27ea33233eee
work_keys_str_mv	AT samuelhausler interactionassistedreversalofthermopowerwithultracoldatoms AT philippfabritius interactionassistedreversalofthermopowerwithultracoldatoms AT jeffreymohan interactionassistedreversalofthermopowerwithultracoldatoms AT martinlebrat interactionassistedreversalofthermopowerwithultracoldatoms AT lauracorman interactionassistedreversalofthermopowerwithultracoldatoms AT tilmanesslinger interactionassistedreversalofthermopowerwithultracoldatoms
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Interaction-Assisted Reversal of Thermopower with Ultracold Atoms

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