Thermoelectric Hall Effect at High-Magnetic-Field Quantum Limit in Graphite as a Nodal-Line Semimetal

The high-magnetic-field thermoelectric effect in semimetals with straight nodal lines was theoretically investigated. Three-dimensional (3D) Dirac/Weyl semimetals exhibit constant thermoelectric Hall conductivity at the high-magnetic-field quantum limit, resulting in a boundless linear increase of S...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2022-06, Vol.91 (6)
Main Authors: Osada, Toshihito, Ochi, Tomotaka, Taen, Toshihiro
Format: Article
Language:English
Subjects:
Electromagnetism
Graphite
Low temperature
Materials selection
Metalloids
Quantum Hall effect
Seebeck effect
Thermoelectricity
Thin films
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Summary:The high-magnetic-field thermoelectric effect in semimetals with straight nodal lines was theoretically investigated. Three-dimensional (3D) Dirac/Weyl semimetals exhibit constant thermoelectric Hall conductivity at the high-magnetic-field quantum limit, resulting in a boundless linear increase of Seebeck coefficient. This is known as the quantized thermoelectric Hall effect (QTHE), and is expected to lead to high-performance thermoelectricity at low temperatures. Here, in addition to Dirac/Weyl semimetals with nodal points, we demonstrated that 3D semimetals with straight nodal lines can also exhibit the QTHE under high magnetic fields. As a candidate material for experimental validation, we discussed the thermoelectric properties of bulk graphite. Furthermore, we investigated the dimensional crossover of thermoelectricity to two-dimensional behavior in thin-film graphite, which leads to higher thermoelectric performance at low temperatures.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.91.063701