Decoupling between electric and thermal conduction in low dimensional systems

Chengyu Yan, Michael Pepper, Patrick See, Ian Farrer, David Ritchie, and Jonathan Griffiths

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Apr 10, 2019
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Received Date: 28th March 19

Thermoelectric effects allow the direct conversion of temperature differences to voltage and vice versa. These effects have seen important applications in thermometers, power generators and coolers etc.. The core of the thermoelectric relies on the coupling between heat and charge, i.e. heat current in a conducting system is usually accompanied by charge current. Despite thermal and electric conduction being strongly correlated, the unique ability of monitoring energy flow in a system makes thermal conduction an additional tool to investigate topological properties of a system. For instance, thermal conductance measurements have provided detailed insight on the electronic structure of conducting edge in the fractional quantum Hall regime. Here we studied the thermal conduction in a system comprising two widely separated 1D channels by monitoring the thermo-voltage built between the two channels. We find the position of thermo-voltage peak follows a cubic trend against applied transverse magnetic field instead of a trivial linear or quadratic one. Meanwhile, a unique temperature dependence associated with the magnetic field is also observed. Our results suggest that perhaps heat and charge current are sensitive to different modes in the system.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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