Magnetic-field enhanced high-thermoelectric performance in topological Dirac semimetal Cd$_3$As$_2$ crystal
Abstract
Thermoelectric materials can be used to convert heat to electric power through the Seebeck effect. We study magneto-thermoelectric figure of merit (ZT) in three-dimensional Dirac semimetal CdAs crystal. It is found that enhancement of power factor and reduction of thermal conductivity can be realized at the same time through magnetic field although magnetoresistivity is greatly increased. ZT can be highly enhanced from 0.17 to 1.1 by more than six times around 350 K under a perpendicular magnetic field of 7 Tesla. The huge enhancement of ZT by magnetic field arises from the linear Dirac band with large Fermi velocity and the large electric thermal conductivity in CdAs. Our work paves a new way to greatly enhance the thermoelectric performance in the quantum topological materials.
Keywords
Cite
@article{arxiv.1802.07868,
title = {Magnetic-field enhanced high-thermoelectric performance in topological Dirac semimetal Cd$_3$As$_2$ crystal},
author = {H. H. Wang and X. G. Luo and W. W. Chen and N. Z. Wang and B. Lei and F. B. Meng and C. Shang and L. K. Ma and T. Wu and X. Dai and Z. F. Wang and X. H. Chen},
journal= {arXiv preprint arXiv:1802.07868},
year = {2018}
}
Comments
25 pages, 4 figures, supplementary materials file is not included