title: Two-Carrier Transport Induced Hall Anomaly and Large Tunable Magnetoresistance in Dirac Semimetal Cd3As2 Nanoplates.
abstract: Cd3As2 is a model material of Dirac semimetal with a linear dispersion relation along all three directions in the momentum space. The unique band structure of Cd3As2 is made with both Dirac and topological properties. It can be driven into a Weyl semimetal by symmetry breaking or a topological insulator by enhancing the spin-orbit coupling. Here we report the temperature and gate voltage-dependent magnetotransport properties of Cd3As2 nanoplates with Fermi level near the Dirac point. The Hall anomaly demonstrates the two-carrier transport accompanied by a transition from n-type to p-type conduction with decreasing temperature. The carrier-type transition is explained by considering the temperature-dependent spin-orbit coupling. The magnetoresistance exhibits a large nonsaturating value up to 2000% at high temperatures, which is ascribed to the electron-hole compensation in the system. Our results are valuable for understanding the experimental observations related to the two-carrier transport in Dirac/Weyl semimetals, such as Na3Bi, ZrTe5, TaAs, NbAs, and HfTe5.
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Cai-Zhen
authors.initials: CZ
authors.lastname: Li
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Jin-Guang
authors.initials: JG
authors.lastname: Li
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Li-Xian
authors.initials: LX
authors.lastname: Wang
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Jing-Min
authors.initials: JM
authors.lastname: Zhang
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Yu
authors.affiliation: Collaborative Innovation Center of Quantum Matter , Beijing 100871, P.R. China.
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Liao
keywords: Dirac semimetal; Hall resistance; magnetoresistance; temperature dependence; two-band transport