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題名 Topological phase transitions in an inverted InAs/GaSb quantum well driven by tilted magnetic fields
作者 許琇娟
Hsu, Hsiu-Chuan
Jhang, Min-Jyun
Chen, Tsung-Wei
Guo, Guang-Yu
貢獻者 應物所
日期 2017-04
上傳時間 15-Aug-2019 10:55:38 (UTC+8)
摘要 The helical edge states in a quantum spin Hall insulator are presumably protected by time- reversal symmetry. However, even in the presence of magnetic field which breaks time-reversal symmetry, the helical edge conduction can still exist, dubbed as pseudo quantum spin Hall effect. In this work, the effects of the magnetic fields on the pseudo quantum spin Hall effect and the phase transitions are studied. We show that an in-plane magnetic field drives a pseudo quantum spin Hall state to metallic state at a high field. Moreover, at a fixed in-plane magnetic field, an increasing out-of-plane magnetic field leads to a reentrance of pseudo quantum spin Hall state in an inverted InAs/GaSb quantum well. The edge state probability distribution and Chern numbers are calculated to verify that the reentrant states are topologically nontrivial. The origin of the reentrant behavior is attributed to the nonmonotonic bending of Landau levels and the Landau level mixing caused by the orbital effect induced by the in-plane magnetic field. The robustness to disorder is demonstrated by the numerically calculated quantized conductance for disordered nanowires within Landauer-Büttiker formalism.
關聯 Phys. Rev. B, 95, Vol.19, pp.195408
資料類型 期刊論文
DOI https://doi.org/10.1103/PhysRevB.95.195408
dc.contributor 應物所
dc.creator (作者) 許琇娟
dc.creator (作者) Hsu, Hsiu-Chuan
dc.creator (作者) Jhang, Min-Jyun
dc.creator (作者) Chen, Tsung-Wei
dc.creator (作者) Guo, Guang-Yu
dc.date (日期) 2017-04
dc.date.accessioned 15-Aug-2019 10:55:38 (UTC+8)-
dc.date.available 15-Aug-2019 10:55:38 (UTC+8)-
dc.date.issued (上傳時間) 15-Aug-2019 10:55:38 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/125215-
dc.description.abstract (摘要) The helical edge states in a quantum spin Hall insulator are presumably protected by time- reversal symmetry. However, even in the presence of magnetic field which breaks time-reversal symmetry, the helical edge conduction can still exist, dubbed as pseudo quantum spin Hall effect. In this work, the effects of the magnetic fields on the pseudo quantum spin Hall effect and the phase transitions are studied. We show that an in-plane magnetic field drives a pseudo quantum spin Hall state to metallic state at a high field. Moreover, at a fixed in-plane magnetic field, an increasing out-of-plane magnetic field leads to a reentrance of pseudo quantum spin Hall state in an inverted InAs/GaSb quantum well. The edge state probability distribution and Chern numbers are calculated to verify that the reentrant states are topologically nontrivial. The origin of the reentrant behavior is attributed to the nonmonotonic bending of Landau levels and the Landau level mixing caused by the orbital effect induced by the in-plane magnetic field. The robustness to disorder is demonstrated by the numerically calculated quantized conductance for disordered nanowires within Landauer-Büttiker formalism.
dc.format.extent 649771 bytes-
dc.format.mimetype application/pdf-
dc.relation (關聯) Phys. Rev. B, 95, Vol.19, pp.195408
dc.title (題名) Topological phase transitions in an inverted InAs/GaSb quantum well driven by tilted magnetic fields
dc.type (資料類型) 期刊論文
dc.identifier.doi (DOI) 10.1103/PhysRevB.95.195408
dc.doi.uri (DOI) https://doi.org/10.1103/PhysRevB.95.195408