Evidence for topological superconductivity: Topological edge states in Bi2Te3/FeTe heterostructure

doi:10.1088/1674-1056/abaf9c

中国物理B ›› 2020, Vol. 29 ›› Issue (9): 97403-097403.doi: 10.1088/1674-1056/abaf9c

所属专题： SPECIAL TOPIC — Topological 2D materials

Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure

Bin Guo(郭斌), Kai-Ge Shi(师凯歌), Hai-Lang Qin(秦海浪), Liang Zhou(周良), Wei-Qiang Chen(陈伟强), Fei Ye(叶飞), Jia-Wei Mei(梅佳伟), Hong-Tao He(何洪涛), Tian-Luo Pan(潘天洛), Gan Wang(王干)

1 Shenzhen Institute for Quantum Science and Engineering & Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
2 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

收稿日期:2020-04-13 修回日期:2020-05-29 接受日期:2020-08-15 出版日期:2020-09-05 发布日期:2020-09-05
通讯作者: Tian-Luo Pan, Gan Wang E-mail:wangg@sustech.edu.cn;pantl@sustech.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61734008 and 11774143), the National Key Research and Development Program of China (Grant Nos. 2018YFA0307100, 2016YFA0301703, and 2016YFA0300300), the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2015A030313840 and 2017A030313033), the State Key Laboratory of Low-Dimensional Quantum Physics (Grant No. KF201602), Technology and Innovation Commission of Shenzhen Municipality, China (Grant Nos. ZDSYS20170303165926217 and JCYJ20170412152334605), and Guangdong Provincial Key Laboratory, China (Grant No. 2019B121203002). J.-W.M. was partially supported by the Program for Guangdong Introducing Innovative and Entrepreneurial Teams, China (Grant No. 2017ZT07C062).

Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure

Bin Guo(郭斌)¹, Kai-Ge Shi(师凯歌)¹, Hai-Lang Qin(秦海浪)¹, Liang Zhou(周良)¹, Wei-Qiang Chen(陈伟强)¹, Fei Ye(叶飞)¹, Jia-Wei Mei(梅佳伟)¹, Hong-Tao He(何洪涛)¹, Tian-Luo Pan(潘天洛)¹, Gan Wang(王干)^1,2

1 Shenzhen Institute for Quantum Science and Engineering & Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China;
2 Guangdong Provincial Key Laboratory of Quantum Science and Engineering, Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China

Received:2020-04-13 Revised:2020-05-29 Accepted:2020-08-15 Online:2020-09-05 Published:2020-09-05
Contact: Tian-Luo Pan, Gan Wang E-mail:wangg@sustech.edu.cn;pantl@sustech.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61734008 and 11774143), the National Key Research and Development Program of China (Grant Nos. 2018YFA0307100, 2016YFA0301703, and 2016YFA0300300), the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2015A030313840 and 2017A030313033), the State Key Laboratory of Low-Dimensional Quantum Physics (Grant No. KF201602), Technology and Innovation Commission of Shenzhen Municipality, China (Grant Nos. ZDSYS20170303165926217 and JCYJ20170412152334605), and Guangdong Provincial Key Laboratory, China (Grant No. 2019B121203002). J.-W.M. was partially supported by the Program for Guangdong Introducing Innovative and Entrepreneurial Teams, China (Grant No. 2017ZT07C062).

摘要/Abstract

摘要： Majorana fermions have been predicted to exist at the edge states of a two-dimensional topological superconductor. We fabricated single quintuple layer (QL) Bi₂Te₃/FeTe heterostructure with the step-flow epitaxy method and studied the topological properties of this system by using angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. We observed the coexistence of robust superconductivity and edge states on the single QL Bi₂Te₃ islands which can be potential evidence for topological superconductor.

关键词: Bi₂Te₃/FeTe heterostructure, topological superconductivity, edge states, scanning tunnelling microcopy

Abstract: Majorana fermions have been predicted to exist at the edge states of a two-dimensional topological superconductor. We fabricated single quintuple layer (QL) Bi₂Te₃/FeTe heterostructure with the step-flow epitaxy method and studied the topological properties of this system by using angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. We observed the coexistence of robust superconductivity and edge states on the single QL Bi₂Te₃ islands which can be potential evidence for topological superconductor.

Key words: Bi₂Te₃/FeTe heterostructure, topological superconductivity, edge states, scanning tunnelling microcopy

中图分类号: (Tunneling phenomena: single particle tunneling and STM)

74.55.+v

74.70.Xa (Pnictides and chalcogenides) 74.78.-w (Superconducting films and low-dimensional structures) 74.78.Fk (Multilayers, superlattices, heterostructures)

郭斌, 师凯歌, 秦海浪, 周良, 陈伟强, 叶飞, 梅佳伟, 何洪涛, 潘天洛, 王干. Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure[J]. 中国物理B, 2020, 29(9): 97403-097403.

Bin Guo(郭斌), Kai-Ge Shi(师凯歌), Hai-Lang Qin(秦海浪), Liang Zhou(周良), Wei-Qiang Chen(陈伟强), Fei Ye(叶飞), Jia-Wei Mei(梅佳伟), Hong-Tao He(何洪涛), Tian-Luo Pan(潘天洛), Gan Wang(王干). Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure[J]. Chin. Phys. B, 2020, 29(9): 97403-097403.

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Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure

Evidence for topological superconductivity: Topological edge states in Bi₂Te₃/FeTe heterostructure

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