| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
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タイトル |
Zigzag edge modes in a Z2 topological insulator : Reentrance and completely flat spectrum |
|
言語 |
en |
| 作成者 |
Imura, Ken-Ichiro
Yamakage, Ai
Mao, Shijun
Hotta, Akira
Kuramoto, Yoshio
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| アクセス権 |
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|
アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
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権利情報 |
(c) 2010 American Physical Society |
| 主題 |
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主題Scheme |
NDC |
|
主題 |
420 |
| 内容記述 |
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内容記述 |
The spectrum and wave function of helical edge modes in Ζ_2 topological insulator are derived on a square lattice using Bernevig-Hughes-Zhang (BHZ) model. The BHZ model is characterized by a “mass" term M(k)=Δ-Βk^2. A topological insulator realizes when the parameters Δ and Β fall on the regime, either 0<Δ/Β<4 or 4<Δ/Β<8. At Δ/Β=4, which separates the cases of positive and negative (quantized) spin Hall conductivities, the edge modes show a corresponding change that depends on the edge geometry. In the (1,0) edge, the spectrum of edge mode remains the same against change in Δ/Β, although the main location of the mode moves from the zone center for Δ/Β<4, to the zone boundary for Δ/Β>4 of the one-dimensional (1D) Brillouin zone. In the (1,1)-edge geometry, the group velocity at the zone center changes sign at Δ/Β=4 where the spectrum becomes independent of the momentum, i.e., flat, over the whole 1D Brillouin zone. Furthermore, for Δ/Β<1.354, the edge mode starting from the zone center vanishes in an intermediate region of the 1D Brillouin zone, but reenters near the zone boundary, where the energy of the edge mode is marginally below the lowest bulk excitations. On the other hand, the behavior of reentrant mode in real space is indistinguishable from an ordinary edge mode. |
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言語 |
en |
| 出版者 |
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出版者 |
American Physical Society |
| 言語 |
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|
言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 出版タイプ |
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|
出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
10.1103/PhysRevB.82.085118 |
| 関連情報 |
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|
識別子タイプ |
URI |
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関連識別子 |
http://link.aps.org/doi/10.1103/PhysRevB.82.085118 |
| 収録物識別子 |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
1098-0121 |
| 収録物識別子 |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11187113 |
| 開始ページ |
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|
開始ページ |
085118 |
| 書誌情報 |
Physical Review B
Physical Review B
巻 82,
号 8,
p. 085118,
発行日 2010
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| 旧ID |
34064 |
PhysRevB.82.085118.pdf (2.8 MB)
