Disorder-driven topological phase transition in films
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics & Astronomy
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering
- Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics & Materials Science
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter, Dept. of Physics and Astronomy
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Chemistry
- Hankuk Univ. of Foreign Studies, Yongin-shi (Korea). Dept. of Physics
- Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter, Dept. of Physics and Astronomy
- Univ. of Colorado, Boulder, CO (United States)
Topological insulators (TI) are a phase of matter that host unusual metallic states on their surfaces. Unlike the states that exist on the surface of conventional materials, these so-called topological surfaces states (TSS) are protected against disorder-related localization effects by time reversal symmetry through strong spin-orbit coupling. By combining transport measurements, angle-resolved photo-emission spectroscopy and scanning tunneling microscopy, we show that there exists a critical level of disorder beyond which the TI Bi2Se3 loses its ability to protect the metallic TSS and transitions to a fully insulating state. The absence of the metallic surface channels dictates that there is a change in material’s topological character, implying that disorder can lead to a topological phase transition even without breaking the time reversal symmetry. This observation challenges the conventional notion of topologically-protected surface states, and will provoke new studies as to the fundamental nature of topological phase of matter in the presence of disorder.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; FG0203ER46066; AC02-05CH11231; W911NF-15-1-0560; DMR-1506618; DMREF-1233349; DMR-1126468; GBMF4418; DMR-1308142; DMR-1106070; GBMF2628; DESC0012704
- OSTI ID:
- 1336221
- Alternate ID(s):
- OSTI ID: 1328573
- Report Number(s):
- BNL-113250-2016-JA; PRBMDO; R&D Project: MA015MACA; KC0201010
- Journal Information:
- Physical Review B, Vol. 94, Issue 16; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Anharmonic effect driven topological phase transition in predicted by first-principles calculations
|
journal | October 2018 |
Similar Records
Room-Temperature Topological Phase Transition in Quasi-One-Dimensional Material
Topological semimetal to insulator quantum phase transition in the Zintl compounds