Shubnikov de Haas quantum oscillation of the surface states in the metallic Bismuth Telluride sheets

TL;DR

This study investigates the surface states of metallic Bi2Te3 sheets through Shubnikov de Haas oscillations, revealing two-dimensional surface transport contributions in a metallic topological insulator.

Contribution

It demonstrates the presence of resolvable surface conduction in metallic Bi2Te3 sheets using quantum oscillation measurements, highlighting surface state effects in a metallic topological insulator.

Findings

Oscillations show cosine dependence on angle, indicating 2D surface transport.

Surface contribution to conduction is detectable even in metallic Bi2Te3.

Quantum oscillations confirm surface states in metallic topological insulators.

Abstract

Metallic Bi2Te3 crystalline sheets with the room-temperature resistivity of above 10 m{\Omega} cm were prepared and their magnetoresistive transport was measured in a field of up to 9 Tesla. The Shubnikov de Haas oscillations were identified from the secondly-derived magnetoresistance curves. While changing the angle between the field and normal axis of the sheets, we find that the oscillation periods present a cosine dependence on the angle. This indicates a two-dimensional transport due to the surface state. The work reveals a resolvable surface contribution to the overall conduction even in a metallic topological insulator.