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Wallpaper fermions and the nonsymmorphic Dirac insulator
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0003-2540-6202
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2018 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 361, no 6399, p. 246-+Article in journal (Refereed) Published
Abstract [en]

Materials whose gapless surface states are protected by crystal symmetries include mirror topological crystalline insulators and nonsymmorphic hourglass insulators. There exists only a very limited set of possible surface crystal symmetries, captured by the 17 "wallpaper groups." Here we show that a consideration of symmetry-allowed band degeneracies in the wallpaper groups can be used to understand previously described topological crystalline insulators and to predict phenomenologically distinct examples. In particular, the two wallpaper groups with multiple glide lines, pgg and p4g, allow for a topological insulating phase whose surface spectrum consists of only a single, fourfolddegenerate, true Dirac fermion, representing an exception to a symmetry-enhanced fermion-doubling theorem. We theoretically predict the presence of this phase in Sr2Pb3 in space group 127 (P4/mbm).

Place, publisher, year, edition, pages
American Association for the Advancement of Science , 2018. Vol. 361, no 6399, p. 246-+
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URN: urn:nbn:se:kth:diva-232890DOI: 10.1126/science.aan2802ISI: 000439145800035PubMedID: 30026220Scopus ID: 2-s2.0-85050538230OAI: oai:DiVA.org:kth-232890DiVA, id: diva2:1237613
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QC 20180809

Available from: 2018-08-09 Created: 2018-08-09 Last updated: 2018-08-09Bibliographically approved

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