Tuning the vertical location of helical surface states in topological insulator heterostructures via dual-proximity effects
- 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
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics; Univ. of Texas, Austin, TX (United States). Dept. of Physics
- Chinese Academy of Sciences (CAS), Shenyang (China). Inst. of Metal Research. Shenyang National Lab. for Materials Science
- 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
- 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
- Southeast Univ., Nanjing (China). Dept. of Physics
- 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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