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Influence of correlations on the orbital magnetization of the spin-1/2 Haldane-Hubbard model
Department of Physics, Division of Mathematical Physics, Lund University, Sweden.
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Fysik och matematik)ORCID iD: 0000-0002-7023-4043
Department of Physics, Division of Mathematical Physics, Lund University, Sweden.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 5, p. 054427-1-054427-8, article id 054427Article in journal (Refereed) Published
Abstract [en]

Orbital magnetization is known empirically to play an important role in several magnetic phenomena, suchas permanent magnetism and ferromagnetic superconductivity. Within the recently developed “modern theoryof orbital magnetization,” theoretical insight has been gained into the nature of this often neglected contributionto magnetism but is based on an underlying mean-field approximation. From this theory, a few treatments haveemerged which also take into account correlations beyond the mean-field approximation. Here, we apply thes cheme developed in a previous work [F. Aryasetiawan et al., Phys. Rev. B 93, 161104(R) (2016)] to thespin- 1/2 Haldane-Hubbard model to investigate the effect of charge fluctuations on the orbital magnetizationwithin the GW approximation. Qualitatively, we are led to distinguish between two quite different situations:(i) When the lattice potential is larger than the nearest-neighbor hopping, the correlations are found to boostthe orbital magnetization. (ii) If the nearest-neighbor hopping is instead larger than the lattice potential, thecorrelations reduce the magnetization. The boost and reduction are identified to stem from interband andintraband correlations, respectively, and the relative importance of the two varies with the strength of the latticepotential. We finally study graphene with parameters obtained from first principles.

Place, publisher, year, edition, pages
2019. Vol. 100, no 5, p. 054427-1-054427-8, article id 054427
Keywords [en]
BERRY PHASE, REALIZATION
National Category
Condensed Matter Physics
Research subject
Physics and Mathematics
Identifiers
URN: urn:nbn:se:his:diva-17609DOI: 10.1103/PhysRevB.100.054427ISI: 000481815900005Scopus ID: 2-s2.0-85072013362OAI: oai:DiVA.org:his-17609DiVA, id: diva2:1347700
Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-23Bibliographically approved

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Karlsson, Krister

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