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Magnetoresistivity in Weyl/Dirac semimetal

hwangbl's picture

hwangbl - Posted on 19 November 2017

Project Description: 

Negative magnetoresistivity (NMR) has been regarded as a transport signature for the chiral anomaly in Weyl/Dirac semi-metal, however, more and more experiments have revealed that materials without well-defined chirality can also host NMR. In this project, by doing the numerical calculation at low magnetic field, we hope to provide a more intrinsic transport signature for the chiral anomaly in Weyl semi-metal beyond NMR, like planer Hall effect and anisotropic magnetoresistivity.

Researcher name: 
Shunqing, Shen
Researcher position: 
professor
Researcher department: 
Department of Physics
Researcher email: 
sshen@hku.hk
Researcher name: 
Huanwen, WANG
Researcher position: 
postgraduate student
Researcher department: 
Department of Physics
Researcher email: 
hwangbl@connect.hku.hk
Researcher name: 
Bo, Fu
Researcher position: 
Postdoctoral Fellow
Researcher department: 
Department of Physics
Researcher email: 
bofu123@mail.ustc.edu.cn
Research Project Details
Project Duration: 
11/2017 to 11/2018
Project Significance: 
In this project, we will study the transport properties of the Weyl/Dirac semimetal under different scattering potential, compare the quantum theory and semi-classical theory when magnetic field goes to zero and figure out the physics origin of NMR in Weyl/Dirac semimetal. Furthermore, we want to find a new signature for the chiral anomaly beyond the NMR in Weyl/Dirac semimetal.
Results Achieved: 
Li, Hui,et al. "Giant Anisotropic Magnetoresistance and Planar Hall Effect in Dirac Semimetal Cd3As2."arXiv:1711.03671 (2017).
Remarks: 
Under the magnetic field, the electrons in solids will be confined into a serial of Landau levels, when the magnetic field is very strong, we only need to consider the lowest Landau level. When the magnetic field is very small, we have to consider many Landau levels to calculate the transport related quantities, like the conductivity tensor. To obtain a reasonable result, we usually have to include 10^7 to 10^9 Landau levels to make the calculation converged, this process is very time-consuming, and we believe that HPC can help us solve this problem.