Two-dimensional universal conductance fluctuations and the electron-phonon interaction of topological surface states in Bi2Te2Se nanoribbons

Abstract

The universal conductance fluctuations (UCFs), one of the most important manifestations of mesoscopic electronic interference, have not yet been demonstrated for the two-dimensional surface state of topological insulators (TIs). Even if one delicately suppresses the bulk conductance by improving the quality of TI crystals, the fluctuation of the bulk conductance still keeps competitive and difficult to be separated from the desired UCFs of surface carriers. Here we report on the experimental evidence of the UCFs of the two-dimensional surface state in the bulk insulating Bi2Te2Se nanoribbons. The solely-B\perp-dependent UCF is achieved and its temperature dependence is investigated. The surface transport is further revealed by weak antilocalizations. Such survived UCFs of the topological surface states result from the limited dephasing length of the bulk carriers in ternary crystals. The electron-phonon interaction is addressed as a secondary source of the surface state dephasing based on the temperature-dependent scaling behavior.

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Cited by in corpus (10)

• Quantum interference and Aharonov-Bohm oscillations in topological insulators
• Weak Antilocalization Effect and Noncentrosymmetric Superconductivity in a Topologically Nontrivial Semimetal LuPdBi
• Evidence of surface transport and weak anti-localization in single crystal of Bi2Te2Se topological insulator
• Experimental evidence and control of the bulk-mediated intersurface coupling in topological insulator Bi2Te2Se nanoribbons
• Low temperature saturation of phase coherence length in topological insulators
• Observation of multichannel quantum coherent transport and electron-electron interaction in Bi2Te3 single crystal
• Universal conductance fluctuations and phase-coherent transport in a semiconductor Bi${}_2$O${}_2$Se nanoplate with strong spin-orbit interaction
• Indications of the topological transport by the universal conductance fluctuations in the Bi2Te2Se microflakes
• Transport in topological insulators with bulk-surface coupling: Interference corrections and conductance fluctuations
• Universal Conductance Fluctuations of Topological Insulators