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Title: Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor

Abstract

Majorana zero modes (MZMs) are spatially-localized zero-energy fractional quasiparticles with non-Abelian braiding statistics that hold promise for topological quantum computing. Owing to the particle-antiparticle equivalence, MZMs reflect quantized conductance at low temperature. By utilizing variable-tunnel-coupled scanning tunneling spectroscopy, we study tunneling conductance of vortex bound states on FeTe0.55Se0.45 superconductors. Here, we report observations of conductance plateaus as a function of tunnel coupling for zero-energy vortex bound states with values close to or even reaching the 2e2/h quantum conductance (here eis the electron charge and h is Planck’s constant). In contrast, no plateaus were observed on either finite energy vortex bound states or in the continuum of electronic states outside the superconducting gap. This behavior of the zero-mode conductance confirms the existence of MZMs in FeTe0.55Se0.45.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China); Songshan Lake Materials Lab., Dongguan (China)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1579493
Report Number(s):
BNL-212402-2019-JAAM
Journal ID: ISSN 0036-8075
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 367; Journal Issue: 6474; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhu, Shiyu, Kong, Lingyuan, Cao, Lu, Chen, Hui, Papaj, Michał, Du, Shixuan, Xing, Yuqing, Liu, Wenyao, Wang, Dongfei, Shen, Chengmin, Yang, Fazhi, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Zhang, Yu-Yang, Ding, Hong, and Gao, Hong-Jun. Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor. United States: N. p., 2019. Web. doi:10.1126/science.aax0274.
Zhu, Shiyu, Kong, Lingyuan, Cao, Lu, Chen, Hui, Papaj, Michał, Du, Shixuan, Xing, Yuqing, Liu, Wenyao, Wang, Dongfei, Shen, Chengmin, Yang, Fazhi, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Zhang, Yu-Yang, Ding, Hong, & Gao, Hong-Jun. Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor. United States. doi:https://doi.org/10.1126/science.aax0274
Zhu, Shiyu, Kong, Lingyuan, Cao, Lu, Chen, Hui, Papaj, Michał, Du, Shixuan, Xing, Yuqing, Liu, Wenyao, Wang, Dongfei, Shen, Chengmin, Yang, Fazhi, Schneeloch, John, Zhong, Ruidan, Gu, Genda, Fu, Liang, Zhang, Yu-Yang, Ding, Hong, and Gao, Hong-Jun. Thu . "Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor". United States. doi:https://doi.org/10.1126/science.aax0274. https://www.osti.gov/servlets/purl/1579493.
@article{osti_1579493,
title = {Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor},
author = {Zhu, Shiyu and Kong, Lingyuan and Cao, Lu and Chen, Hui and Papaj, Michał and Du, Shixuan and Xing, Yuqing and Liu, Wenyao and Wang, Dongfei and Shen, Chengmin and Yang, Fazhi and Schneeloch, John and Zhong, Ruidan and Gu, Genda and Fu, Liang and Zhang, Yu-Yang and Ding, Hong and Gao, Hong-Jun},
abstractNote = {Majorana zero modes (MZMs) are spatially-localized zero-energy fractional quasiparticles with non-Abelian braiding statistics that hold promise for topological quantum computing. Owing to the particle-antiparticle equivalence, MZMs reflect quantized conductance at low temperature. By utilizing variable-tunnel-coupled scanning tunneling spectroscopy, we study tunneling conductance of vortex bound states on FeTe0.55Se0.45 superconductors. Here, we report observations of conductance plateaus as a function of tunnel coupling for zero-energy vortex bound states with values close to or even reaching the 2e2/h quantum conductance (here eis the electron charge and h is Planck’s constant). In contrast, no plateaus were observed on either finite energy vortex bound states or in the continuum of electronic states outside the superconducting gap. This behavior of the zero-mode conductance confirms the existence of MZMs in FeTe0.55Se0.45.},
doi = {10.1126/science.aax0274},
journal = {Science},
number = 6474,
volume = 367,
place = {United States},
year = {2019},
month = {12}
}

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Works referenced in this record:

Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled Superconductor
journal, November 1978


Quantized Majorana conductance
journal, March 2018

  • Zhang, Hao; Liu, Chun-Xiao; Gazibegovic, Sasa
  • Nature, Vol. 556, Issue 7699
  • DOI: 10.1038/nature26142

Quantized conductance of point contacts in a two-dimensional electron gas
journal, February 1988


Robust and Clean Majorana Zero Mode in the Vortex Core of High-Temperature Superconductor ( Li 0.84 Fe 0.16 ) OHFeSe
journal, December 2018


Quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor (Li 0.84 Fe 0.16 )OHFeSe
journal, April 2019


Proposal to measure the quasiparticle poisoning time of Majorana bound states
journal, April 2014


Tunneling characteristics of a chain of Majorana bound states
journal, November 2010


Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
journal, August 2010


Half-integer level shift of vortex bound states in an iron-based superconductor
journal, August 2019


Nonequilibrium theory of tunneling into a localized state in a superconductor
journal, September 2014


Topological nature of the FeSe 0.5 Te 0.5 superconductor
journal, September 2015


Helical Liquids and Majorana Bound States in Quantum Wires
journal, October 2010


Majorana Zero Mode Detected with Spin Selective Andreev Reflection in the Vortex of a Topological Superconductor
journal, June 2016


Signatures of Majorana Fermions in Hybrid Superconductor-Semiconductor Nanowire Devices
journal, April 2012


Conductance Quantization at Zero Magnetic Field in InSb Nanowires
journal, May 2016


A scanning tunneling microscope for spectroscopic imaging below 90 mK in magnetic fields up to 17.5 T
journal, September 2018

  • Machida, T.; Kohsaka, Y.; Hanaguri, T.
  • Review of Scientific Instruments, Vol. 89, Issue 9
  • DOI: 10.1063/1.5049619

Proposal for realizing Majorana fermions in chains of magnetic atoms on a superconductor
journal, July 2013


Quantum point contact as a probe of a topological superconductor
journal, May 2011


Quantized zero-bias conductance plateau in semiconductor-superconductor heterostructures without topological Majorana zero modes
journal, October 2018


Quantum transport in semiconductor-superconductor microjunctions
journal, November 1992


Unpaired Majorana fermions in quantum wires
journal, October 2001


Resonant tunneling in semiconductor double barriers
journal, June 1974

  • Chang, L. L.; Esaki, L.; Tsu, R.
  • Applied Physics Letters, Vol. 24, Issue 12
  • DOI: 10.1063/1.1655067

Ballistic superconductivity in semiconductor nanowires
journal, July 2017

  • Zhang, Hao; Gül, Önder; Conesa-Boj, Sonia
  • Nature Communications, Vol. 8, Issue 1
  • DOI: 10.1038/ncomms16025

Non-Abelian anyons and topological quantum computation
journal, September 2008


Majorana Fermion Induced Resonant Andreev Reflection
journal, December 2009


Vortex-core structure observed with a scanning tunneling microscope
journal, May 1990


Fault-tolerant quantum computation by anyons
journal, January 2003


Superconducting Proximity Effect and Majorana Fermions at the Surface of a Topological Insulator
journal, March 2008


Generic New Platform for Topological Quantum Computation Using Semiconductor Heterostructures
journal, January 2010


Observation of topological superconductivity on the surface of an iron-based superconductor
journal, March 2018


Bound Fermion states on a vortex line in a type II superconductor
journal, May 1964


Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
journal, October 2014


Majorana zero modes in superconductor–semiconductor heterostructures
journal, May 2018

  • Lutchyn, R. M.; Bakkers, E. P. A. M.; Kouwenhoven, L. P.
  • Nature Reviews Materials, Vol. 3, Issue 5
  • DOI: 10.1038/s41578-018-0003-1

Quantized conductance doubling and hard gap in a two-dimensional semiconductor–superconductor heterostructure
journal, September 2016

  • Kjaergaard, M.; Nichele, F.; Suominen, H. J.
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms12841

Electron temperature and tunnel coupling dependence of zero-bias and almost-zero-bias conductance peaks in Majorana nanowires
journal, November 2017


Ballistic Majorana nanowire devices
journal, January 2018


Evidence for Majorana bound states in an iron-based superconductor
journal, August 2018


Zero-energy vortex bound state in the superconducting topological surface state of Fe(Se,Te)
journal, June 2019


    Works referencing / citing this record:

    Generic quantized zero-bias conductance peaks in superconductor-semiconductor hybrid structures
    journal, January 2020