Dirac state in a centrosymmetric superconductor α-PdBi2

Dimitri, Klauss; Hosen, M. Mofazzel; Dhakal, Gyanendra; Choi, Hongchul; Kabir, Firoza; Sims, Christopher; Kaczorowski, Dariusz; Durakiewicz, Tomasz; Zhu, Jianxin; Neupane, Madhab

doi:10.1103/PhysRevB.97.144514

Title: Dirac state in a centrosymmetric superconductor $α - {PdBi}_{2}$

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.144514· OSTI ID:1471354

Dimitri, Klauss ^[1]; Hosen, M. Mofazzel ^[1]; Dhakal, Gyanendra ^[1];

^[2]; Kabir, Firoza ^[1]; Sims, Christopher ^[1]; Kaczorowski, Dariusz ^[3]; Durakiewicz, Tomasz ^[4];

^[2]; Neupane, Madhab ^[1]

Univ. of Central Florida, Orlando, FL (United States). Dept. of Physics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Polish Academy of Sciences, Wroclaw (Poland). Inst. of Low Temperature and Structure Research
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Skłodowska Univ., Lublin (Poland). Inst. of Physics, Maria Curie

Topological superconductor (TSC) hosting Majorana fermions has been established as a milestone that may shift our scientific trajectory from research to applications in topological quantum computing. Recently, superconducting Pd-Bi binaries have attracted great attention as a possible medium for the TSC phase as a result of their large spin-orbit coupling strength. Here, we report a systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) study on the normal state electronic structure of superconducting α - PdBi₂ (T_c = 1.7 K). Our results show the presence of Dirac states at higher-binding energy with the location of the Dirac point at 1.26 eV below the chemical potential at the zone center. Furthermore, the ARPES data indicate multiple band crossings at the chemical potential, consistent with the metallic behavior of α - PdBi₂. Our detailed experimental studies are complemented by first-principles calculations, which reveal the presence of surface Rashba states residing in the vicinity of the chemical potential. The obtained results provide an opportunity to investigate the relationship between superconductivity, topology, and the Majorana fermion, as well as explore pathways to possible future platforms for topological quantum computing.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Science Centre (Poland)

Grant/Contract Number:: AC52-06NA25396; 2015/18/A/ST3/00057

OSTI ID:: 1471354

Alternate ID(s):: OSTI ID: 1434345

Report Number(s):: LA-UR-17-26987; PRBMDO

Journal Information:: Physical Review B, Vol. 97, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Title: Dirac state in a centrosymmetric superconductor $α - {PdBi}_{2}$