Doping-induced topological phase transition in Bi: The role of quantum electronic stress
SCIE
SCOPUS
- Title
- Doping-induced topological phase transition in Bi: The role of quantum electronic stress
- Authors
- Jin, Kyung-Hwan; Yeom, Han Woong; Liu, Feng
- Date Issued
- 2020-01
- Publisher
- AMER PHYSICAL SOC
- Abstract
- Charge doping is an essential means to tailor a materials' properties. However, besides moving the Fermi level, charge doping is generally not expected to induce topological phase transition (TPT). Here, using first-principles calculations, we demonstrate an electron doping-induced TPT in bulk Bi from a higher-order topological insulator (HOTI) to a TI. The underlying mechanism is revealed to be driven by an electron doping-induced quantum electronic stress (QES), which in turn induces a highly anisotropic lattice expansion to close/reopen the small energy gap in Bi band structure. Our finding significantly resolves an outstanding controversy concerning the topological characterization of bulk Bi among existing experiments and theories, and explains the physical origin of the topological order in Bi (111) thin films. It sheds new light on the fundamental understanding of topological properties of small band gap materials in relation to doping and QES.
- Keywords
- Calculations; Energy gap; Semiconductor doping; Topological insulators; Anisotropic lattices; Bandgap materials; Charge doping; Electron-doping; First-principles calculation; Topological order; Topological phase; Topological properties; Topology
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/101124
- DOI
- 10.1103/PhysRevB.101.035111
- ISSN
- 2469-9950
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 101, no. 3, 2020-01
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