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dc.contributor.authorLinder, Jacob
dc.contributor.authorTanaka, Yukio
dc.contributor.authorYokoyama, Takehito
dc.contributor.authorSudbø, Asle
dc.contributor.authorNagaosa, Naoto
dc.date.accessioned2017-09-18T07:11:47Z
dc.date.available2017-09-18T07:11:47Z
dc.date.created2010-05-25T18:38:01Z
dc.date.issued2010
dc.identifier.citationPhysical Review B. Condensed Matter and Materials Physics. 2010, 81 (18), .nb_NO
dc.identifier.issn1098-0121
dc.identifier.urihttp://hdl.handle.net/11250/2455002
dc.description.abstractWe study theoretically proximity-induced superconductivity and ferromagnetism on the surface of a topological insulator. In particular, we investigate how the Andreev-bound states are influenced by the interplay between these phenomena, taking also into account the possibility of unconventional pairing. We find a qualitative difference in the excitation spectrum when comparing spin-singlet and spin-triplet pairing, leading to nongapped excitations in the latter case. The formation of surface states and their dependence on the magnetization orientation is investigated, and it is found that these states are Majorana fermions in the dxy-wave case in stark contrast to the topologically trivial high-Tc cuprates. The signature of such states in the conductance spectra is studied, and we also compute the supercurrent which flows on the surface of the topological insulator when a Josephson junction is deposited on top of it. It is found that the current exhibits an anomalous current-phase relation when the region separating the superconducting banks is ferromagnetic, and we also show that in contrast to the metallic case the exchange field in such a scenario does not induce 0-π oscillations in the critical current. Similarly to the high-Tc cuprates, the presence of zero-energy surface states on the topological surface leads to a strong low-temperature enhancement of the critical current.nb_NO
dc.language.isoengnb_NO
dc.publisherAmerican Physical Societynb_NO
dc.titleInterplay between superconductivity and ferromagnetism on a topological insulatornb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber11nb_NO
dc.source.volume81nb_NO
dc.source.journalPhysical Review B. Condensed Matter and Materials Physicsnb_NO
dc.source.issue18nb_NO
dc.identifier.doi10.1103/PhysRevB.81.184525
dc.identifier.cristin348719
dc.description.localcodeThis is the authors' accepted and refereed manuscript to the article.nb_NO
cristin.unitcode194,66,20,0
cristin.unitnameInstitutt for fysikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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