Thermopower as a tool to investigate many-body effects in quantum systems

Liney Halla Kristinsdottir; Jakob Bengtsson; Heiner Linke; Stephanie Reimann; Andreas Wacker

doi:10.1063/1.4893928

Thermopower as a tool to investigate many-body effects in quantum systems

Liney Halla Kristinsdottir, Jakob Bengtsson, Heiner Linke, Stephanie Reimann, Andreas Wacker

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Abstract

Measuring the thermopower of a confined quantum system reveals important information about its excitation spectrum. Our simulations show how this kind of transport spectroscopy is able to extract a clear signal for the onset of Wigner localization in a nanowire segment. This demonstrates that thermopower measurements provide a tool for investigating complex many-body quantum effects, which is less intrusive than the usual charge-stability diagram as no high source-drain bias is required. While the effect is most pronounced for weak tunnel coupling and low temperatures, the excited states also significantly affect the thermopower spectrum at moderate temperature, adding distinct features to the characteristic thermopower lineshape. (C) 2014 AIP Publishing LLC.

Original language	English
Article number	083105
Journal	Applied Physics Letters
Volume	105
Issue number	8
DOIs	https://doi.org/10.1063/1.4893928
Publication status	Published - 2014

Subject classification (UKÄ)

Condensed Matter Physics

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10.1063/1.4893928

apl2014KristinsdottirFinal published version, 679 KB

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title = "Thermopower as a tool to investigate many-body effects in quantum systems",

abstract = "Measuring the thermopower of a confined quantum system reveals important information about its excitation spectrum. Our simulations show how this kind of transport spectroscopy is able to extract a clear signal for the onset of Wigner localization in a nanowire segment. This demonstrates that thermopower measurements provide a tool for investigating complex many-body quantum effects, which is less intrusive than the usual charge-stability diagram as no high source-drain bias is required. While the effect is most pronounced for weak tunnel coupling and low temperatures, the excited states also significantly affect the thermopower spectrum at moderate temperature, adding distinct features to the characteristic thermopower lineshape. (C) 2014 AIP Publishing LLC.",

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AU - Bengtsson, Jakob

AU - Linke, Heiner

AU - Reimann, Stephanie

AU - Wacker, Andreas

PY - 2014

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AB - Measuring the thermopower of a confined quantum system reveals important information about its excitation spectrum. Our simulations show how this kind of transport spectroscopy is able to extract a clear signal for the onset of Wigner localization in a nanowire segment. This demonstrates that thermopower measurements provide a tool for investigating complex many-body quantum effects, which is less intrusive than the usual charge-stability diagram as no high source-drain bias is required. While the effect is most pronounced for weak tunnel coupling and low temperatures, the excited states also significantly affect the thermopower spectrum at moderate temperature, adding distinct features to the characteristic thermopower lineshape. (C) 2014 AIP Publishing LLC.

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M3 - Article

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 8

M1 - 083105

ER -

Thermopower as a tool to investigate many-body effects in quantum systems

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