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Mechanism of hole propagation in the orbital compass models

Mechanism of hole propagation in the orbital compass models

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dc.contributor.author Brzezicki, Wojciech [SAP13902919] pl
dc.contributor.author Daghofer, Maria pl
dc.contributor.author Oleś, Andrzej [SAP11009398] pl
dc.date.accessioned 2015-03-11T10:49:49Z
dc.date.available 2015-03-11T10:49:49Z
dc.date.issued 2014 pl
dc.identifier.issn 1098-0121 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/3702
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title Mechanism of hole propagation in the orbital compass models pl
dc.type JournalArticle pl
dc.abstract.en We explore the propagation of a single hole in the quantum compass model, whose nematic ground state is given by mutually decoupled antiferromagnetic chains. The compass model can be seen as the strong-coupling limit of a spinless two-band Hubbard model, which we study here using mean-field theory and the variational cluster approach. Due to the symmetries of the compass model, the inherent disorder along one lattice direction turns out not to affect hole motion, and doping a hole consequently does not lift the subextensive degeneracy of the nematic phase. To broaden and deepen understanding, we derive a generalized itinerant model and address the transition to two-dimensional Ising order. We observe coherent hole motion in both the nematic and the antiferromagnetic phases, also in the presence of quantum fluctuations away from pure Ising exchange. In addition to quantum fluctuations and interorbital hopping, three-site hopping is found to play an important role and to dominate propagation in the two-dimensional Ising limit as well as along the antiferromagnetic chains in the nematic order which forms in the compass model. pl
dc.description.volume 89 pl
dc.description.number 2 pl
dc.description.publication 1 pl
dc.identifier.doi 10.1103/PhysRevB.89.024417 pl
dc.identifier.eissn 1550-235X pl
dc.identifier.eissn 1538-4489 pl
dc.title.journal Physical Review. B, Condensed Matter and Materials Physics pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego pl
dc.subtype Article pl
dc.identifier.articleid 024417 pl
dc.rights.original bez licencji pl
.pointsMNiSW [2014 A]: 35

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