Strain-controlled evolution of electronic structure indicating topological phase transition in the quasi-one-dimensional superconductor TaSe3
Jounghoon Hyun, Min Yong Jeong, Myung-Chul Jung, Yeonghoon Lee, Younsik Kim, Saegyeol Jung, Byeongjun Seok, Junseong Song, Chan-young Lim, Jaehun Cha, Gyubin Lee, Yeojin An, Makoto Hashimoto, Donghui Lu, Jonathan D. Denlinger, Sung Wng Kim, Changyoung Kim, Myung Joon Han, Sunghun Kim, Yeongkwan Kim
DOI 10.1103/PhysRevB.105.115143 · Physical Review B
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Abstract
We report the signature of a strain-controlled topological phase transition in the electronic structure of a quasi-one-dimensional superconductor TaSe3. Using angle-resolved photoemission spectroscopy and first-principles calculation, TaSe3 is identified to be in a weak topological insulator phase which has topologically nontrivial surface states only at the allowed planes. Under uniaxial tensile strain, a Dirac point and the topological surface state emerge on the originally forbidden (101¯) plane, which demonstrates the transition to a strong topological insulator phase. Our results accomplish the experimental realization of possible topological insulating phases in TaSe3 and highlight the possibility of coupling the superconductivity with two distinct topological insulating phases in a controllable manner.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TaSe3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
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