Observation of Planar Hall Effect in Topological Insulator -- Bi${}_2$Te${}_3$

Abstract

Planar Hall effect (PHE) in topological insulators (TIs) is discussed as an effect that stems mostly from conduction due to topologically protected surface states. Although surfaces states play a critical role and are of utmost importance in TIs, our present study reflects the need for considering the bulk conduction in understanding PHE in TIs. Here, we demonstrate an enhancement in PHE amplitude by three times by doubling the thickness of Bi${}_2$Te${}_3$ film on Si (111). The PHE amplitude reaches $\approx$~6 n$\Omega$m in 30 quintuple layer (QL) device as compared to $\approx$~2 n$\Omega$m in 14 QL. We find that the PHE amplitude increases with temperature in the 30 QL Bi${}_2$Te${}_3$ films grown on Si (111) and Al${}_2$O${}_3$ (0001). Our experiments indicate that the contribution of bulk states to PHE in TIs could be significant.

References in corpus (11)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Topological origin of subgap conductance in insulating bilayer graphene
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Bulk Band Gap and Surface State Conduction Observed in Voltage-Tuned Crystals of the Topological Insulator Bi${}_2$Se${}_3$
• Transport Properties of Topological Insulators: Band Bending, Bulk Metal-to-Insulator Transition, and Weak Anti-Localization
• Nonlinear planar Hall effect
• Anisotropic and strong negative magneto-resistance in the three-dimensional topological insulator Bi2Se3
• Bulk Band Structure of Bi${}_2$Te${}_3$
• Weak Localization and Antilocalization in Topological Materials with Impurity Spin-Orbit Interactions
• Spin-polarized tunneling current through a thin film of topological insulator in a parallel magnetic field
• Transport in topological insulators with bulk-surface coupling: Interference corrections and conductance fluctuations

Cited by in corpus (5)

• Efficient spin current source using a half-Heusler alloy topological semimetal with Back-End-of-Line compatibility
• Quantum Transport and Potential of Topological States for Thermoelectricity in Bi${}_2$Te${}_3$ Thin Films
• Transverse currents in spin transistors
• Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals
• Anisotropic planar Hall effects in Bi${}_2$Se${}_3$/EuS interfaces: Deciphering the role of proximity induced spin canting and topological spin texture