Surface-state Coulomb repulsion accelerates a metal-insulator transition in topological semimetal nanofilms.

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ID: 101719
2020
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Abstract
The emergence of quantization at the nanoscale, the quantum size effect (QSE), allows flexible control of matter and is a rich source of advanced functionalities. A QSE-induced transition into an insulating phase in semimetallic nanofilms was predicted for bismuth a half-century ago and has regained new interest with regard to its surface states exhibiting nontrivial electronic topology. Here, we reveal an unexpected mechanism of the transition by high-resolution angle-resolved photoelectron spectroscopy combined with theoretical calculations. Anomalous evolution and degeneracy of quantized energy levels indicate that increased Coulomb repulsion from the surface states deforms a quantum confinement potential with decreasing thickness. The potential deformation strongly modulates spatial distributions of quantized wave functions, which leads to acceleration of the transition beyond the original QSE picture. This discovery establishes a complete picture of the long-discussed transition and highlights a new class of size effects dominating nanoscale transport in systems with metallic surface states.
Reference Key
ito2020surfacestatescience Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ito, S;Arita, M;Haruyama, J;Feng, B;Chen, W-C;Namatame, H;Taniguchi, M;Cheng, C-M;Bian, G;Tang, S-J;Chiang, T-C;Sugino, O;Komori, F;Matsuda, I;
Journal Science advances
Year 2020
DOI
10.1126/sciadv.aaz5015
URL
Keywords
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