Indications of the topological transport by the universal conductance fluctuations in the Bi2Te2Se microflakes

Abstract

Universal conductance fluctuations (UCFs) are extracted in the magnetoresistance responses in the bulk-insulating Bi2Te2Se microflakes. Its two-dimensional character is demonstrated by the field-tilting magnetoresistance measurements. Its origin from the surface electrons is determined by the fact that the UCF amplitudes keep unchanged while applying an in-plane field to suppress the coherence of bulk electrons. After considering the ensemble average in a batch of micrometer-sized samples, the intrinsic UCF magnitudes of over 0.37 e2/h is obtained. This agrees with the theoretical prediction on topological surface states. All the evidence point to the successful observation of the UCF of topological surface states.

arXiv commentAccepted by Applied Physics Express

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• Weak Antilocalization and Universal Conductance Fluctuations in Bismuth Telluro-Sulfide Topological Insulators
• Universal conductance fluctuations and direct observation of crossover of symmetry classes in topological insulators
• Conductance fluctuations in disordered 2D topological insulator wires: From quantum spin-Hall to ordinary quantum phases
• Quantum Interference Effects in Topological Nanowires In a Longitudinal Magnetic Field
• Transport in topological insulators with bulk-surface coupling: Interference corrections and conductance fluctuations
• Universal Conductance Fluctuations of Topological Insulators
• Diagnosing the magnetic field-tuned symmetry nature of the topological electrons by conductance fluctuations in bulk-insulating BiSbTeSe2 devices
• Fermi energy sensitive universal conductance fluctuations in anisotropic materials