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Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep01233· OSTI ID:1624588
 [1];  [2];  [3];  [4];  [5];  [3];  [6];  [3];  [7]
  1. Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale. ICQD; Southeast Univ., Nanjing (China). Dept. of Physics; DOE/OSTI
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics; Univ. of Texas, Austin, TX (United States). Dept. of Physics
  3. Chinese Academy of Sciences (CAS), Shenyang (China). Inst. of Metal Research. Shenyang National Lab. for Materials Science
  4. Fudan Univ., Shanghai (China). Dept. of Physics. State Key Lab. of Surface Physics; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics; Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale. ICQD
  5. Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale. ICQD; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics
  6. Southeast Univ., Nanjing (China). Dept. of Physics
  7. Univ. of Science and Technology of China, Hefei (China). Hefei National Lab. for Physical Sciences at the Microscale. ICQD; Harvard Univ., Cambridge, MA (United States). School of Applied Science and Engineering; Univ. of Texas, Austin, TX (United States). Dept. of Physics
In integrating topological insulators (TIs) with conventional materials, one crucial issue is how the topological surface states (TSS) will behave in such heterostructures. We use first-principles approaches to establish accurate tunability of the vertical location of the TSS via intriguing dual-proximity effects. By depositing a conventional insulator (CI) overlayer onto a TI substrate (Bi2Se3 or Bi2Te3), we demonstrate that, the TSS can float to the top of the CI film, or stay put at the CI/TI interface, or be pushed down deeper into the otherwise structurally homogeneous TI substrate. These contrasting behaviors imply a rich variety of possible quantum phase transitions in the hybrid systems, dictated by key material-specific properties of the CI. These discoveries lay the foundation for accurate manipulation of the real space properties of TSS in TI heterostructures of diverse technological significance.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-02ER45958; FG03-02ER45958
OSTI ID:
1624588
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 3; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Surface Reactivity Enhancement on a Pd/Bi2Te3 Heterostructure through Robust Topological Surface States journal August 2013
Spin pumping in Ferromagnet-Topological Insulator-Ferromagnet Heterostructures journal January 2015
The effect of substrate and surface plasmons on symmetry breaking at the substrate interface of the topological insulator Bi2Te3 journal April 2019
Modelling near-surface bound electron states in a 3D topological insulator: analytical and numerical approaches journal October 2014
Band bending at the surface of Bi2Se3 studied from first principles journal December 2015
Orbit- and atom-resolved spin textures of intrinsic, extrinsic, and hybridized Dirac cone states journal April 2014
Band bending driven evolution of the bound electron states at the interface between a three-dimensional topological insulator and a three-dimensional normal insulator journal February 2015
Colloquium : Topological band theory journal June 2016