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The phase transition from a topological insulator to a trivial band insulatoris studied by angle-resoled photoemission spectroscopy onBi$_{2-x}$In$_{x}$Se$_{3}$ single crystals. We first report the completeevolution of the bulk band structures throughout the transition. The robustsurface state and the bulk gap size ($\sim$ 0.50 eV) show no significant changeupon doping for $x$ = 0.05, 0.10 and 0.175. At $x$ $\geq$ 0.225, the surfacestate completely disappears and the bulk gap size increases, suggesting asudden gap-closure and topological phase transition around $x \sim$0.175$-$0.225. We discuss the underlying mechanism of the phase transition,proposing that it is governed by the combined effect of spin-orbit coupling andinteractions upon band hybridization. Our study provides a new venue toinvestigate the mechanism of the topological phase transition induced bynon-magnetic impurities.

Sudden gap-closure across the topological phase transition in Bi$_{2-x}$In$_{x}$Se$_{3}$