Topological surface states in superconducting CaBi2
Qi Jiang, Deyang Wang, Zhengtai Liu, Zhicheng Jiang, Haoji Qian, Xiaoping Shen, Ang Li, Dawei Shen, Shan Qiao, Mao Ye
DOI 10.1103/PhysRevB.104.245112 · Physical Review B
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Abstract
Topological superconductors are materials in which superconductivity is closely entangled with topological electronic states. This provides a promising route to create Majorana bound states that are of fundamental importance to fault-tolerant quantum computation. In this paper, the recently discovered superconductor CaBi2 has been identified as a three-dimensional topological material. Spin-split topological surface states intersecting the Fermi energy are experimentally observed via spin- and angle-resolved photoemission spectroscopy. They are highly consistent with theoretical calculations. Furthermore, the layer-locked spin structure of CaBi2 is revealed via the layer-resolved spin texture analysis. These results unambiguously reveal the topological properties of the spin-polarized electronic structure in CaBi2 and provide important clues in the search for Majorana fermions in Bi-based topological superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaBi2 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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