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Magnetic field induced strong valley polarization in the three-dimensional topological semimetal LaBi

2017; American Physical Society; Volume: 96; Issue: 16 Linguagem: Inglês

10.1103/physrevb.96.161103

2469-9977

Nitesh Kumar, Chandra Shekhar, Johannes Klotz, J. Wosnitza, Claudia Felser,

2D Materials and Applications

LaBi is a three-dimensional rocksalt-type material with a surprisingly quasi-two-dimensional electronic structure. It exhibits excellent electronic properties such as the existence of nontrivial Dirac cones, extremely large magnetoresistance, and high charge-carrier mobility. The cigar-shaped electron valleys make the charge transport highly anisotropic when the magnetic field is varied from one crystallographic axis to another. We show that the electrons can be polarized effectively in these electron valleys under a rotating magnetic field. We achieved a polarization of 60% at 2 K despite the coexistence of three-dimensional hole pockets. The valley polarization in LaBi is compared to the sister compound LaSb where it is found to be smaller. The performance of LaBi is comparable to the highly efficient bismuth.