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Hund nodal line semimetals: The case of a twisted magnetic phase in the double-exchange model
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.
Imdea Nanosci, Faraday 9, Madrid 28015, Spain.;Univ Manchester, Sch Phys & Astron, Manchester M13 9PY, Lancs, England..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, S-10691 Stockholm, Sweden.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 2, article id 020404Article in journal (Refereed) Published
Abstract [en]

We propose a class of topological metals, which we dub Hund nodal line semimetals, arising from the strong Coulomb interaction encoded in the Hund's coupling between itinerant electrons and localized spins. We here consider a particular twisted spin configuration, which is realized in the double-exchange model which describes the manganite oxides. The resulting effective tetragonal lattice of electrons with hoppings tied to the local spin features an antiunitary nonsymmorphic symmetry that, in turn, together with another nonsymmorphic but unitary glide-mirror symmetry, protects crossings of a double pair of bands along a high-symmetry line on the Brillouin zone boundary. We also discuss the stability of Hund nodal line semimetals with respect to symmetry breaking arising from various perturbations of the twisted phase. Our results motivate further studies of other realizations of this state of matter, for instance, in different spin backgrounds, properties of its drumhead surface states, as well as its stability to disorder and interactions among the itinerant electrons.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 2, article id 020404
Keywords [en]
GENNES PG, 1960, PHYSICAL REVIEW, V118, P141 Rui, 2017, PHYSICAL REVIEW LETTERS, V119, rgert W., 2018, Group Theory in Solid State Physics and Photonics: Problem Solving with Mathematica, y Bitan, 2017, PHYSICAL REVIEW B, V96, Jiabin, 2017, PHYSICAL REVIEW B, V95, Hoi Chun, 2017, NATURE COMMUNICATIONS, V8, y Bitan, 2017, PHYSICAL REVIEW B, V95, rakami Shuichi, 2007, NEW JOURNAL OF PHYSICS, V9, dica E, 2004, PHYSICAL REVIEW B, V70
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-243944DOI: 10.1103/PhysRevB.99.020404ISI: 000456807400002Scopus ID: 2-s2.0-85060897773OAI: oai:DiVA.org:kth-243944DiVA, id: diva2:1293923
Note

QC 20190305

Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05Bibliographically approved

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Geilhufe, MatthiasJuricic, Vladimir

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