Impurity and dispersion effects on the linear magnetoresistance in the quantum limit

被引:2
|
作者
Li, Shuai [1 ,2 ,3 ,4 ,5 ,6 ]
Lu, Hai-Zhou [2 ,3 ,4 ,5 ,6 ]
Xie, X. C. [7 ,8 ,9 ]
机构
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
[2] Southern Univ Sci & Technol SUSTech, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
[3] Southern Univ Sci & Technol SUSTech, Dept Phys, Shenzhen 518055, Peoples R China
[4] Quantum Sci Ctr Guangdong Hong Kong Macao Greater, Hong Kong 518045, Peoples R China
[5] Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
[6] Int Quantum Acad, Shenzhen 518048, Peoples R China
[7] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
[8] Fudan Univ, Inst Nanoelect Devices & Quantum Comp, Shanghai 200433, Peoples R China
[9] Hefei Natl Lab, Hefei 230088, Peoples R China
基金
中国国家自然科学基金;
关键词
DENSITY; STATES;
D O I
10.1103/PhysRevB.107.235202
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetoresistance, that is, the change of the resistance with the magnetic field, is usually a quadratic function of the field strength. A linear magnetoresistance usually reveals extraordinary properties of a system. In the quantum limit where only the lowest Landau band is occupied, a quantum linear magnetoresistance was believed to be the signature of the Weyl fermions with 3D linear dispersion. Here, we comparatively investigate the quantum-limit magnetoresistance of systems with different band dispersions as well as different types of impurities. We find that the magnetoresistance can also be linear for the quadratic energy dispersion. We show that both longitudinal and transverse magnetoresistance can be linear if long-range-Gaussian-type impurities dominate, but Coulomb-type impurities can only induce linear transverse magnetoresistance. Our findings well explain some of the linear magnetoresistance observed in the experiments and provide insights to the understanding of quantum-limit magnetoresistance.
引用
收藏
页数:19
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