Evidence for topological edge states in a large energy gap near the step edges on the surface of ZrTe5

R. Wu; J. Z. Ma; S. M. Nie; L. X. Zhao; X. Huang; J. X. Yin; B. B. Fu; P. Richard; G. F. Chen; Z. Fang; X. Dai; H. M. Weng; T. Qian; H. Ding; S. H. Pan

doi:10.1103/PhysRevX.6.021017

Evidence for topological edge states in a large energy gap near the step edges on the surface of ZrTe₅

R. Wu, J. Z. Ma, S. M. Nie, L. X. Zhao, X. Huang, J. X. Yin, B. B. Fu, P. Richard, G. F. Chen, Z. Fang, X. Dai, H. M. Weng^*, T. Qian^*, H. Ding, S. H. Pan^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Abstract

Two-dimensional topological insulators with a large bulk band gap are promising for experimental studies of quantum spin Hall effect and for spintronic device applications. Despite considerable theoretical efforts in predicting large-gap two-dimensional topological insulator candidates, none of them have been experimentally demonstrated to have a full gap, which is crucial for quantum spin Hall effect. Here, by combining scanning tunneling microscopy/spectroscopy and angle-resolved photoemission spectroscopy, we reveal that ZrTe₅ crystal hosts a large full gap of ~100 meV on the surface and a nearly constant density of states within the entire gap at the monolayer step edge. These features are well reproduced by our first-principles calculations, which point to the topologically nontrivial nature of the edge states.

Original language	English
Article number	021017
Journal	Physical Review X
Volume	6
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevX.6.021017
Publication status	Published - 2016
Externally published	Yes

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title = "Evidence for topological edge states in a large energy gap near the step edges on the surface of ZrTe5",

abstract = "Two-dimensional topological insulators with a large bulk band gap are promising for experimental studies of quantum spin Hall effect and for spintronic device applications. Despite considerable theoretical efforts in predicting large-gap two-dimensional topological insulator candidates, none of them have been experimentally demonstrated to have a full gap, which is crucial for quantum spin Hall effect. Here, by combining scanning tunneling microscopy/spectroscopy and angle-resolved photoemission spectroscopy, we reveal that ZrTe5 crystal hosts a large full gap of ~100 meV on the surface and a nearly constant density of states within the entire gap at the monolayer step edge. These features are well reproduced by our first-principles calculations, which point to the topologically nontrivial nature of the edge states.",

author = "R. Wu and Ma, {J. Z.} and Nie, {S. M.} and Zhao, {L. X.} and X. Huang and Yin, {J. X.} and Fu, {B. B.} and P. Richard and Chen, {G. F.} and Z. Fang and X. Dai and Weng, {H. M.} and T. Qian and H. Ding and Pan, {S. H.}",

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doi = "10.1103/PhysRevX.6.021017",

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T1 - Evidence for topological edge states in a large energy gap near the step edges on the surface of ZrTe5

AU - Wu, R.

AU - Ma, J. Z.

AU - Nie, S. M.

AU - Zhao, L. X.

AU - Huang, X.

AU - Yin, J. X.

AU - Fu, B. B.

AU - Richard, P.

AU - Chen, G. F.

AU - Fang, Z.

AU - Dai, X.

AU - Weng, H. M.

AU - Qian, T.

AU - Ding, H.

AU - Pan, S. H.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2016

Y1 - 2016

N2 - Two-dimensional topological insulators with a large bulk band gap are promising for experimental studies of quantum spin Hall effect and for spintronic device applications. Despite considerable theoretical efforts in predicting large-gap two-dimensional topological insulator candidates, none of them have been experimentally demonstrated to have a full gap, which is crucial for quantum spin Hall effect. Here, by combining scanning tunneling microscopy/spectroscopy and angle-resolved photoemission spectroscopy, we reveal that ZrTe5 crystal hosts a large full gap of ~100 meV on the surface and a nearly constant density of states within the entire gap at the monolayer step edge. These features are well reproduced by our first-principles calculations, which point to the topologically nontrivial nature of the edge states.

AB - Two-dimensional topological insulators with a large bulk band gap are promising for experimental studies of quantum spin Hall effect and for spintronic device applications. Despite considerable theoretical efforts in predicting large-gap two-dimensional topological insulator candidates, none of them have been experimentally demonstrated to have a full gap, which is crucial for quantum spin Hall effect. Here, by combining scanning tunneling microscopy/spectroscopy and angle-resolved photoemission spectroscopy, we reveal that ZrTe5 crystal hosts a large full gap of ~100 meV on the surface and a nearly constant density of states within the entire gap at the monolayer step edge. These features are well reproduced by our first-principles calculations, which point to the topologically nontrivial nature of the edge states.

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DO - 10.1103/PhysRevX.6.021017

M3 - RGC 21 - Publication in refereed journal

SN - 2160-3308

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JO - Physical Review X

JF - Physical Review X

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