Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator

Abstract

We report current-direction dependent or unidirectional magnetoresistance (UMR) in magnetic/nonmagnetic topological insulator (TI) heterostructures, Cr${}_x$(Bi${}_{1-y}$Sb${}_y$)${}_{2-x}$Te${}_3$/(Bi${}_{1-y}$Sb${}_y$)${}_2$Te${}_3$, that is several orders of magnitude larger than in other reported systems. From the magnetic field and temperature dependence, the UMR is identified to originate from the asymmetric scattering of electrons by magnons. In particular, the large magnitude of UMR is an outcome of spin-momentum locking and a small Fermi wavenumber at the surface of TI. In fact, the UMR is maximized around the Dirac point with the minimal Fermi wavenumber.

References in corpus (5)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Observation of the Magnon Hall Effect
• Longitudinal Spin Seebeck Effect Free from the Proximity Nernst Effect
• Quantum Hall Effect on Top and Bottom Surface States of Topological Insulator (Bi1-xSbx)2Te3 Films
• Electrical detection of magnetization reversal without auxiliary magnets

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