Demonstration of surface transport in a hybrid Bi2Se3/Bi2Te3 heterostructure

Abstract

In spite of much work on topological insulators (TIs), systematic experiments for TI/TI heterostructures remain absent. We grow a high quality heterostructure containing single quintuple layer (QL) of Bi2Se3 on 19 QLs of Bi2Te3 and compare its transport properties with 20 QLs Bi2Se3 and 20 QLs Bi2Te3. All three films are grown on insulating sapphire (0001) substrates by molecular beam epitaxy (MBE). In situ angle-resolved photoemission spectroscopy (ARPES) provides direct evidence that the surface state of 1 QL Bi2Se3 / 19 QLs Bi2Te3 heterostructure is similar to the surface state of the 20 QLs Bi2Se3 and different with that of the 20 QLs Bi2Te3. In ex situ transport measurements, the observed linear magnetoresistance (MR) and weak antilocalization (WAL) of the hybrid heterostructure are similar to that of the pure Bi2Se3 film and not the Bi2Te3 film. This suggests that the single Bi2Se3 QL layer on top of 19 QLs Bi2Te3 dominates its transport properties.

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• Quantum Hall States Stabilized in Semi-magnetic Bilayers of Topological Insulators
• Superconductivity in topologically nontrivial material Au2Pb
• Linear magnetoresistance in a quasi-free two dimensional electron gas in an ultra-high mobility GaAs quantum well
• Growth, characterization, and transport properties of ternary (Bi1-xSbx)2Te3 topological insulator layers
• Experimental realization of a topological p-n junction by intrinsic defect-grading
• Band engineering of Dirac surface states in topological insulators-based van der Waals heterostructures
• Conductivity Corrections for Topological Insulators with Spin-Orbit Impurities: A New Hikami-Larkin-Nagaoka Formula
• Weak Localization and Antilocalization in Topological Materials with Impurity Spin-Orbit Interactions
• Quantum electronic transport of topological surface states in beta-Ag2Se nanowire
• Pressure-Induced Insulator-to-Metal Transition in van der Waals compound CoPS${}_3$
• Quantum Transport and Potential of Topological States for Thermoelectricity in Bi${}_2$Te${}_3$ Thin Films
• Modeling Near-Surface Bound Electron States in Three-Dimensional Topological Insulator: Analytical and Numerical Approaches
• Topological Effects on the Magnetoconductivity in Topological Insulators
• Magnetic Order in 3D Topological Insulators -- Wishful Thinking or Gateway to Emergent Quantum Effects?
• Band structure of topological insulators from noise measurements in tunnel junctions
• On the half-quantized Hall conductance of massive surface electrons in magnetic topological insulator films
• From classical to quantum regime of topological surface states via defect engineering