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The universal conductance fluctuations (UCFs), one of the most importantmanifestations of mesoscopic electronic interference, have not yet beendemonstrated for the two-dimensional surface state of topological insulators(TIs). Even if one delicately suppresses the bulk conductance by improving thequality of TI crystals, the fluctuation of the bulk conductance still keepscompetitive and difficult to be separated from the desired UCFs of surfacecarriers. Here we report on the experimental evidence of the UCFs of thetwo-dimensional surface state in the bulk insulating Bi2Te2Se nanoribbons. Thesolely-B\perp-dependent UCF is achieved and its temperature dependence isinvestigated. The surface transport is further revealed by weakantilocalizations. Such survived UCFs of the topological surface states resultfrom the limited dephasing length of the bulk carriers in ternary crystals. Theelectron-phonon interaction is addressed as a secondary source of the surfacestate dephasing based on the temperature-dependent scaling behavior.

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