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Title: Evidence for Majorana bound states in an iron-based superconductor

Abstract

The search for Majorana bound state (MBS) has recently emerged as one of most active research areas in condensed matter physics, due to its non-Abelian statistics which can be used for robust quantum computation. A highly soughtafter platform for MBS is two-dimensional topological superconductors, where MBS is predicted to exist as a zero-energy mode in the core of a vortex. A clear observation of MBS, however, is often hindered by the presence of additional low-energy bound states inside the vortex core. By using scanning tunneling microscope on the newly discovered superconducting topological surface state of iron-based superconductor FeTe 1-xSe x (x = 0.45, T c = 14.5 K), we clearly observe a pristine MBS inside a vortex core, well separated from non-topological bound states which are pushed away from zero energy due to the high ratio between the superconducting gap and the Fermi energy in this material. This observation offers a new, robust platform for realizing and manipulating Majorana bound states at a relatively high temperature.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3];  [3];  [3];  [4]; ORCiD logo [5]; ORCiD logo [5]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Acedemy of Sciences, Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Acedemy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1480965
Alternate Identifier(s):
OSTI ID: 1466624
Report Number(s):
[BNL-209413-2018-JAAM; BNL-207981-2018-JAAM]
[Journal ID: ISSN 0036-8075]
Grant/Contract Number:  
[SC0012704]
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
[ Journal Volume: 362; Journal Issue: 6412]; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wang, Dongfei, Kong, Lingyuan, Fan, Peng, Chen, Hui, Zhu, Shiyu, Liu, Wenyao, Cao, Lu, Sun, Yujie, Du, Shixuan, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Ding, Hong, and Gao, Hong-Jun. Evidence for Majorana bound states in an iron-based superconductor. United States: N. p., 2018. Web. doi:10.1126/science.aao1797.
Wang, Dongfei, Kong, Lingyuan, Fan, Peng, Chen, Hui, Zhu, Shiyu, Liu, Wenyao, Cao, Lu, Sun, Yujie, Du, Shixuan, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Ding, Hong, & Gao, Hong-Jun. Evidence for Majorana bound states in an iron-based superconductor. United States. doi:10.1126/science.aao1797.
Wang, Dongfei, Kong, Lingyuan, Fan, Peng, Chen, Hui, Zhu, Shiyu, Liu, Wenyao, Cao, Lu, Sun, Yujie, Du, Shixuan, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Ding, Hong, and Gao, Hong-Jun. Thu . "Evidence for Majorana bound states in an iron-based superconductor". United States. doi:10.1126/science.aao1797. https://www.osti.gov/servlets/purl/1480965.
@article{osti_1480965,
title = {Evidence for Majorana bound states in an iron-based superconductor},
author = {Wang, Dongfei and Kong, Lingyuan and Fan, Peng and Chen, Hui and Zhu, Shiyu and Liu, Wenyao and Cao, Lu and Sun, Yujie and Du, Shixuan and Schneeloch, John and Zhong, Ruidan and Gu, Genda and Fu, Liang and Ding, Hong and Gao, Hong-Jun},
abstractNote = {The search for Majorana bound state (MBS) has recently emerged as one of most active research areas in condensed matter physics, due to its non-Abelian statistics which can be used for robust quantum computation. A highly soughtafter platform for MBS is two-dimensional topological superconductors, where MBS is predicted to exist as a zero-energy mode in the core of a vortex. A clear observation of MBS, however, is often hindered by the presence of additional low-energy bound states inside the vortex core. By using scanning tunneling microscope on the newly discovered superconducting topological surface state of iron-based superconductor FeTe1-xSex (x = 0.45, Tc = 14.5 K), we clearly observe a pristine MBS inside a vortex core, well separated from non-topological bound states which are pushed away from zero energy due to the high ratio between the superconducting gap and the Fermi energy in this material. This observation offers a new, robust platform for realizing and manipulating Majorana bound states at a relatively high temperature.},
doi = {10.1126/science.aao1797},
journal = {Science},
number = [6412],
volume = [362],
place = {United States},
year = {2018},
month = {8}
}

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    Works referencing / citing this record:

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    Exploring Topological Superconductivity in Topological Materials
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    Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)
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