Prediction of superconductivity and topological aspects in single-layer β-Bi2Pd

Liu, Peng-Fei; Li, Jingyu; Tu, Xin-Hai; Yin, Huabing; Sa, Baisheng; Zhang, Junrong; Singh, David J.; Wang, Bao-Tian

doi:10.1103/physrevb.102.155406

Title: Prediction of superconductivity and topological aspects in single-layer β-Bi₂Pd

Journal Article · Wed Oct 07 00:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.102.155406· OSTI ID:1852835

^[1];

^[2]; Tu, Xin-Hai ^[1];

^[2];

^[3]; Zhang, Junrong ^[1]; Singh, David J. ^[4];

^[5]

Chinese Academy of Sciences (CAS), Dongguan (China)
Henan University, Kaifeng (China)
Fuzhou University (China)
Univ. of Missouri, Columbia, MO (United States)
Chinese Academy of Sciences (CAS), Dongguan (China); Shanxi Univ., Taiyuan (China)

Topological superconductors, characterized by topologically nontrivial states residing in a superconducting gap, are a recently discovered class of materials having Majorana fermions. The interplay of superconductivity and topological states gives rise to opportunities for achieving such topological superconductors in condensed matter systems. Up to now, several single-material topological superconductors in this form have been theoretically predicted and experimentally confirmed. Here, using the first-principles calculations, we study the superconducting single-layer β-Bi₂Pd. In this work, the electronic density of states near Fermi level of this monolayer are dominated by the Bi-p and Pd-d orbitals, forming a two-band Fermi surface with multiclass sheets. The presence of soft phonon bands, in cooperation with the electron susceptibility, accounts for electron-phonon superconductivity of single-layer β-Bi₂Pd. With the centrosymmetric structure, single-layer β-Bi₂Pd possesses a continuous gap over the whole Brillouin zone and topological Dirac-like states at its one-dimensional boundary. The present findings would lead to the expectation of one-dimensional topological superconductivity and Majorana bound states in a monolayer candidate of β-Bi₂Pd with intrinsic full-gap superconductivity.

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Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: Guangdong Basic and Applied Basic Research Foundation; Natural Science Foundation of Guangdong Province of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019114; 2018A0303100013; 11675195; 12074381

OSTI ID:: 1852835

Journal Information:: Physical Review. B, Vol. 102, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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