Fermi surface topology and non-trivial Berry phase in the flat-band semimetal Pd\(_3\)Pb

A study of the Fermi surface of the putative topological semimetal Pd\(_3\)Pb has been carried out using Shubnikov-de Haas (SdH) oscillations measured in fields of up to 60 T. Pd\(_3\)Pb has garnered attention in the community due to a peculiar Fermi surface that has been proposed theoretically by A...

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Published inarXiv.org
Main Authors Khan, Mojammel A, Po-Hao, Chang, Ghimire, Nirmal, Bretz-Sullivan, Terence M, Bhattacharya, Anand, Jiang, Jidong S, Singleton, John, Mitchell, John F
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 02.06.2020
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Summary:A study of the Fermi surface of the putative topological semimetal Pd\(_3\)Pb has been carried out using Shubnikov-de Haas (SdH) oscillations measured in fields of up to 60 T. Pd\(_3\)Pb has garnered attention in the community due to a peculiar Fermi surface that has been proposed theoretically by Ahn, Pickett, and Lee, [Phys. Rev. B 98, 035130 (2018)] to host a dispersion-less band along \(X-\Gamma\) as well as multiple triply-degenerate band crossings that, under the influence of spin-orbit coupling, lead to ten four-fold degenerate Dirac points. Analysis of the SdH oscillation data verifies the calculated multi-sheet Fermi surface, revealing a \(\Gamma\) centered spheroid that had not been resolved experimentally in prior studies. A comprehensive, angle-dependent analysis of the phase of the SdH oscillations convincingly demonstrates a non-trivial Berry phase for two bands along \(\Gamma-R\), supporting the theoretical predictions, while simultaneously evidencing interference between extremal orbits that mimics a trivial Berry phase at intermediate angles.
ISSN:2331-8422
DOI:10.48550/arxiv.2006.01871