We investigate the quantum transport properties of surface electrons on atopological insulator Bi2Te3 nanowire in a magnetotransport study. Although thenanowires are synthesized by using a relatively coarse method ofelectrochemical deposition, clear Aharonov-Bohm oscillations of phases 0 and piare observed, owing to the highly coherent surface electron channel. Theoscillation amplitude exhibits exponential temperature dependence, suggestingthat the phase coherence length L_phi is inversely proportional to thetemperature, as in quasi-ballistic systems. In addition, a weakantilocalization analysis on the surface channel by using a one-dimensionallocalization theory, enabled by successful extraction of the surfacecontribution from the magnetoconductance data, is provided in support of thetemperature dependence of L_phi.
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