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題名 High Chern number quantum anomalous Hall phases in single-layer graphene with Haldane orbital coupling
作者 郭光宇
Chen, Tsung-Wei ; Xiao, Zhi-Ren ; Chiou, Dah-Wei ; Guo, Guang-Yu
貢獻者 應物所
日期 2011.10
上傳時間 24-Jan-2014 12:38:11 (UTC+8)
摘要 We investigate possible phase transitions among the different quantum anomalous Hall (QAH) phases in single-layer graphene under the influence of the exchange field. The effective tight-binding Hamiltonian for graphene is made up of the hopping term, the Kane-Mele and Rashba spin-orbit couplings as well as the Haldane orbital term. We find that the variation of the exchange field results in bulk gap-closing phenomena and phase transitions occur in the graphene system. If the Haldane orbital coupling is absent, the phase transition between the chiral (antichiral) edge state () and the pseudoquantum spin Hall state () takes place. Surprisingly, when the Haldane orbital coupling is taken into account, an intermediate QSH phase with two additional edge modes appears in between phases and . This intermediate phase is therefore either the hyperchiral edge state of high Chern number or antihyperchiral edge state of when the direction of exchange field is reversed. We present the band structures, edge state wave functions, and current distributions of the different QAH phases in the system. We also report the critical exchange field values for the QAH phase transitions.
關聯 Physical Review B, 84(16), 165453
資料來源 http://link.aps.org/doi/10.1103/PhysRevB.84.165453
資料類型 article
DOI http://dx.doi.org/10.1103/PhysRevB.84.165453
dc.contributor 應物所en_US
dc.creator (作者) 郭光宇zh_TW
dc.creator (作者) Chen, Tsung-Wei ; Xiao, Zhi-Ren ; Chiou, Dah-Wei ; Guo, Guang-Yuen_US
dc.date (日期) 2011.10en_US
dc.date.accessioned 24-Jan-2014 12:38:11 (UTC+8)-
dc.date.available 24-Jan-2014 12:38:11 (UTC+8)-
dc.date.issued (上傳時間) 24-Jan-2014 12:38:11 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/63542-
dc.description.abstract (摘要) We investigate possible phase transitions among the different quantum anomalous Hall (QAH) phases in single-layer graphene under the influence of the exchange field. The effective tight-binding Hamiltonian for graphene is made up of the hopping term, the Kane-Mele and Rashba spin-orbit couplings as well as the Haldane orbital term. We find that the variation of the exchange field results in bulk gap-closing phenomena and phase transitions occur in the graphene system. If the Haldane orbital coupling is absent, the phase transition between the chiral (antichiral) edge state () and the pseudoquantum spin Hall state () takes place. Surprisingly, when the Haldane orbital coupling is taken into account, an intermediate QSH phase with two additional edge modes appears in between phases and . This intermediate phase is therefore either the hyperchiral edge state of high Chern number or antihyperchiral edge state of when the direction of exchange field is reversed. We present the band structures, edge state wave functions, and current distributions of the different QAH phases in the system. We also report the critical exchange field values for the QAH phase transitions.en_US
dc.format.extent 675913 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) Physical Review B, 84(16), 165453en_US
dc.source.uri (資料來源) http://link.aps.org/doi/10.1103/PhysRevB.84.165453en_US
dc.title (題名) High Chern number quantum anomalous Hall phases in single-layer graphene with Haldane orbital couplingen_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1103/PhysRevB.84.165453en_US
dc.doi.uri (DOI) http://dx.doi.org/10.1103/PhysRevB.84.165453en_US