摘要
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 Cd_3As_2 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 T. 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 Cd_3As_2. Our work paves a new way to greatly enhance the thermoelectric performance in the quantum topological materials.
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 Cd3A 5 2 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 T. 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 CdsA 5 2. Our work paves a new way to greatly enhance the thermoelectric performance in the quantum topological materials.
基金
supported by the National Key R&D Program of the Ministry of Science and Technology China(2017YFA0303001,2016YFA0300201 and 2017YFA0204904)
the National Natural Science Foundation of China(11534010,11774325 and21603210)
the Key Research Program of Frontier Sciences CAS(QYZDY-SSW-SLH021)
Hefei Science Center CAS(2016HSCIU001)
the Fundamental Research Funds for the Central Universities
Supercomputing Center at USTC for providing the computing resources
partially performed on the Superconducting Magnet and PPMS-16T Facilities,High Magnetic Field Laboratory of CAS
关键词
垂直磁场
半金属
热电
拓扑
水晶
性能
CDSA
热传导性
Dirac semimetal Thermoelectric material Magnetic field Enhancement of figure of merit
