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題名 Topological Anderson insulating phases in the long-range Su-Schrieffer-Heeger model 作者 許琇娟
Hsu, Hsu-Chuan
Chen, Tsung-Wei貢獻者 應物所 日期 2020-11 上傳時間 27-Oct-2021 10:59:10 (UTC+8) 摘要 In the long-range Su-Schriffer-Heeger (SSH) model, in which the next nearest-neighbor hopping is considered, there exhibits a rich topological phase diagram that contains winding numbers w=0,1, and 2. In the presence of disorder, the change in mean winding number with various disorder strengths is numerically calculated. We find that the disorder drives phase transitions: w=0→1,0→2, 1→2 and 2→1, in which the non-zero winding numbers driven by disorder are called the topological Anderson insulating (TAI) phases. The transition mechanisms in this long-range SSH model are investigated by means of localization length and self-energy. We find that the localization length has a drastic change at the transition point, and the corresponding critical disorder strength is obtained by further using Born approximation to the self-energy. The origin for the w=0 to w=1,2 transitions is attributed to the energy gap renormalization (first Born approximation), while for the transitions from w=1 to w=2 and vice versa are the strong scattering (self-consistent Born approximation). The result of self-consistent Born approximation suggests that in the thermodynamic limit, the gap closing point is not at the Fermi level for the system with localized edge states. This agrees with the topological protection of edge states, such that the pre-existent edge states are protected from being scattered into bulk. Given the experimental feasibility of the long-range SSH model, the predicted TAI phases and transitions could be observed in experiments. 關聯 Physical Review B, pp.205425 資料類型 article DOI https://doi.org/10.1103/PhysRevB.102.205425 dc.contributor 應物所 dc.creator (作者) 許琇娟 dc.creator (作者) Hsu, Hsu-Chuan dc.creator (作者) Chen, Tsung-Wei dc.date (日期) 2020-11 dc.date.accessioned 27-Oct-2021 10:59:10 (UTC+8) - dc.date.available 27-Oct-2021 10:59:10 (UTC+8) - dc.date.issued (上傳時間) 27-Oct-2021 10:59:10 (UTC+8) - dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/137557 - dc.description.abstract (摘要) In the long-range Su-Schriffer-Heeger (SSH) model, in which the next nearest-neighbor hopping is considered, there exhibits a rich topological phase diagram that contains winding numbers w=0,1, and 2. In the presence of disorder, the change in mean winding number with various disorder strengths is numerically calculated. We find that the disorder drives phase transitions: w=0→1,0→2, 1→2 and 2→1, in which the non-zero winding numbers driven by disorder are called the topological Anderson insulating (TAI) phases. The transition mechanisms in this long-range SSH model are investigated by means of localization length and self-energy. We find that the localization length has a drastic change at the transition point, and the corresponding critical disorder strength is obtained by further using Born approximation to the self-energy. The origin for the w=0 to w=1,2 transitions is attributed to the energy gap renormalization (first Born approximation), while for the transitions from w=1 to w=2 and vice versa are the strong scattering (self-consistent Born approximation). The result of self-consistent Born approximation suggests that in the thermodynamic limit, the gap closing point is not at the Fermi level for the system with localized edge states. This agrees with the topological protection of edge states, such that the pre-existent edge states are protected from being scattered into bulk. Given the experimental feasibility of the long-range SSH model, the predicted TAI phases and transitions could be observed in experiments. dc.format.extent 2814712 bytes - dc.format.mimetype application/pdf - dc.relation (關聯) Physical Review B, pp.205425 dc.title (題名) Topological Anderson insulating phases in the long-range Su-Schrieffer-Heeger model dc.type (資料類型) article dc.identifier.doi (DOI) 10.1103/PhysRevB.102.205425 dc.doi.uri (DOI) https://doi.org/10.1103/PhysRevB.102.205425
