Linear magnetoresistance in topological insulators: Quantum phase coherence effects at high temperatures

Abstract

In addition to the weak antilocalization cusp observed in the magnetoresistance (MR) of topological insulators at low temperatures and low magnetic fields, we find that the high-field MR in Bi2Te2Se is linear in field. At fields up to B=14T the slope of this linear-like MR is nearly independent of temperature over the range T=7 to 150K. We find that the linear MR arises from the competition between a logarithmic phase coherence component and a quadratic component. The quantum phase coherence dominates up to high temperatures, where the coherence length remains longer than the mean free path of electrons.

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
• Tunable Surface Conductivity in Bi2Se3 Revealed in Diffusive Electron Transport
• Low carrier concentration crystals of the topological insulator Bi${}_2$Te${}_2$Se
• Magneto-resistance up to 60 Tesla in Topological Insulator Bi2Te3 Thin Films
• Two-dimensional magnetotransport in Bi2Te2Se nanoplatelets

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