{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Le C"],"funding":["European Research Council"],"pagination":["8311-8315"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC6099897"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["115(33)"],"pubmed_abstract":["Anomalous surface states with Fermi arcs are commonly considered to be a fingerprint of Dirac semimetals (DSMs). In contrast to Weyl semimetals, however, Fermi arcs of DSMs are not topologically protected. Using first-principles calculations, we predict that β-cuprous iodide (β-CuI) is a peculiar DSM whose surface states form closed Fermi pockets instead of Fermi arcs. In such a fermiological Dirac semimetal, the deformation mechanism from Fermi arcs to Fermi pockets stems from a large cubic term preserving all crystal symmetries and from the small energy difference between the surface and bulk Dirac points. The cubic term in β-CuI, usually negligible in prototypical DSMs, becomes relevant because of the particular crystal structure. As such, we establish a concrete material example manifesting the lack of topological protection for surface Fermi arcs in DSMs."],"journal":["Proceedings of the National Academy of Sciences of the United States of America"],"pubmed_title":["Dirac semimetal in <i>β</i>-CuI without surface Fermi arcs."],"pmcid":["PMC6099897"],"funding_grant_id":["336012"],"pubmed_authors":["Li Y","Zhang FC","Hu J","Thomale R","Le C","Wu X","Qin S"],"additional_accession":[]},"is_claimable":false,"name":"Dirac semimetal in <i>β</i>-CuI without surface Fermi arcs.","description":"Anomalous surface states with Fermi arcs are commonly considered to be a fingerprint of Dirac semimetals (DSMs). In contrast to Weyl semimetals, however, Fermi arcs of DSMs are not topologically protected. Using first-principles calculations, we predict that β-cuprous iodide (β-CuI) is a peculiar DSM whose surface states form closed Fermi pockets instead of Fermi arcs. In such a fermiological Dirac semimetal, the deformation mechanism from Fermi arcs to Fermi pockets stems from a large cubic term preserving all crystal symmetries and from the small energy difference between the surface and bulk Dirac points. The cubic term in β-CuI, usually negligible in prototypical DSMs, becomes relevant because of the particular crystal structure. As such, we establish a concrete material example manifesting the lack of topological protection for surface Fermi arcs in DSMs.","dates":{"release":"2018-01-01T00:00:00Z","publication":"2018 Aug","modification":"2026-05-06T06:44:57.517Z","creation":"2025-05-18T12:16:53.354Z"},"accession":"S-EPMC6099897","cross_references":{"pubmed":["30061416"],"doi":["10.1073/pnas.1803599115"]}}