Selective trapping of hexagonally warped topological surface states in a triangular quantum corral

Mu Chen, Ye Ping Jiang, Junping Peng, Huimin Zhang, Cui-Zu Chang, Xiao Feng, Zhenguo Fu, Fawei Zheng, Ping Zhang, Lili Wang, Ke He, Xu Cun Ma, Qi Kun Xue

Research output: Contribution to journalArticle

Abstract

The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which leads to their high transmission through surface defects or potential barriers. Here, we report the behaviors of topological surface states (TSS) in a triangular quantum corral (TQC) which, unlike a circular corral, is supposed to be totally transparent for DFs. By real-space mapping of the electronic structure of TQCs, both the trapping and detrapping behaviors of the TSS are observed. The selection rules are found to be governed by the geometry and spin texture of the constant energy contour of TSS upon the strong hexagonal warping in Bi2Te3. Our work indicates the extended nature of TSS and elucidates the selection rules of the trapping of TSS in the presence of a complicated surface state structure, giving insights into the effective engineering of DFs in TIs.

Original languageEnglish (US)
Article numbereaaw3988
JournalScience Advances
Volume5
Issue number5
DOIs
StatePublished - May 17 2019

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trapping
fermions
surface defects
textures
insulators
engineering
electronic structure
geometry
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General

Cite this

Chen, Mu ; Jiang, Ye Ping ; Peng, Junping ; Zhang, Huimin ; Chang, Cui-Zu ; Feng, Xiao ; Fu, Zhenguo ; Zheng, Fawei ; Zhang, Ping ; Wang, Lili ; He, Ke ; Ma, Xu Cun ; Xue, Qi Kun. / Selective trapping of hexagonally warped topological surface states in a triangular quantum corral. In: Science Advances. 2019 ; Vol. 5, No. 5.
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abstract = "The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which leads to their high transmission through surface defects or potential barriers. Here, we report the behaviors of topological surface states (TSS) in a triangular quantum corral (TQC) which, unlike a circular corral, is supposed to be totally transparent for DFs. By real-space mapping of the electronic structure of TQCs, both the trapping and detrapping behaviors of the TSS are observed. The selection rules are found to be governed by the geometry and spin texture of the constant energy contour of TSS upon the strong hexagonal warping in Bi2Te3. Our work indicates the extended nature of TSS and elucidates the selection rules of the trapping of TSS in the presence of a complicated surface state structure, giving insights into the effective engineering of DFs in TIs.",
author = "Mu Chen and Jiang, {Ye Ping} and Junping Peng and Huimin Zhang and Cui-Zu Chang and Xiao Feng and Zhenguo Fu and Fawei Zheng and Ping Zhang and Lili Wang and Ke He and Ma, {Xu Cun} and Xue, {Qi Kun}",
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Chen, M, Jiang, YP, Peng, J, Zhang, H, Chang, C-Z, Feng, X, Fu, Z, Zheng, F, Zhang, P, Wang, L, He, K, Ma, XC & Xue, QK 2019, 'Selective trapping of hexagonally warped topological surface states in a triangular quantum corral', Science Advances, vol. 5, no. 5, eaaw3988. https://doi.org/10.1126/sciadv.aaw3988

Selective trapping of hexagonally warped topological surface states in a triangular quantum corral. / Chen, Mu; Jiang, Ye Ping; Peng, Junping; Zhang, Huimin; Chang, Cui-Zu; Feng, Xiao; Fu, Zhenguo; Zheng, Fawei; Zhang, Ping; Wang, Lili; He, Ke; Ma, Xu Cun; Xue, Qi Kun.

In: Science Advances, Vol. 5, No. 5, eaaw3988, 17.05.2019.

Research output: Contribution to journalArticle

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T1 - Selective trapping of hexagonally warped topological surface states in a triangular quantum corral

AU - Chen, Mu

AU - Jiang, Ye Ping

AU - Peng, Junping

AU - Zhang, Huimin

AU - Chang, Cui-Zu

AU - Feng, Xiao

AU - Fu, Zhenguo

AU - Zheng, Fawei

AU - Zhang, Ping

AU - Wang, Lili

AU - He, Ke

AU - Ma, Xu Cun

AU - Xue, Qi Kun

PY - 2019/5/17

Y1 - 2019/5/17

N2 - The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which leads to their high transmission through surface defects or potential barriers. Here, we report the behaviors of topological surface states (TSS) in a triangular quantum corral (TQC) which, unlike a circular corral, is supposed to be totally transparent for DFs. By real-space mapping of the electronic structure of TQCs, both the trapping and detrapping behaviors of the TSS are observed. The selection rules are found to be governed by the geometry and spin texture of the constant energy contour of TSS upon the strong hexagonal warping in Bi2Te3. Our work indicates the extended nature of TSS and elucidates the selection rules of the trapping of TSS in the presence of a complicated surface state structure, giving insights into the effective engineering of DFs in TIs.

AB - The surface of a three-dimensional topological insulator (TI) hosts two-dimensional massless Dirac fermions (DFs), the gapless and spin-helical nature of which leads to their high transmission through surface defects or potential barriers. Here, we report the behaviors of topological surface states (TSS) in a triangular quantum corral (TQC) which, unlike a circular corral, is supposed to be totally transparent for DFs. By real-space mapping of the electronic structure of TQCs, both the trapping and detrapping behaviors of the TSS are observed. The selection rules are found to be governed by the geometry and spin texture of the constant energy contour of TSS upon the strong hexagonal warping in Bi2Te3. Our work indicates the extended nature of TSS and elucidates the selection rules of the trapping of TSS in the presence of a complicated surface state structure, giving insights into the effective engineering of DFs in TIs.

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