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Large, nonsaturating thermopower in a quantizing magnetic field

Author(s)
Skinner, Brian J; Fu, Liang
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Abstract
The thermoelectric effect is the generation of an electrical voltage from a temperature gradient in a solid material due to the diffusion of free charge carriers from hot to cold. Identifying materials with a large thermoelectric response is crucial for the development of novel electric generators and coolers. We theoretically consider the thermopower of Dirac/Weyl semimetals subjected to a quantizing magnetic field. We contrast their thermoelectric properties with those of traditional heavily doped semiconductors and show that, under a sufficiently large magnetic field, the thermopower of Dirac/Weyl semimetals grows linearly with the field without saturation and can reach extremely high values. Our results suggest an immediate pathway for achieving record-high thermopower and thermoelectric figure of merit, and they compare well with a recent experiment on Pb1–xSnxSe.
Date issued
2018-05
URI
http://hdl.handle.net/1721.1/118422
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Skinner, Brian, and Liang Fu. “Large, Nonsaturating Thermopower in a Quantizing Magnetic Field.” Science Advances 4, no. 5 (May 2018): eaat2621.
Version: Final published version
ISSN
2375-2548

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