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Title: Evidence for dispersing 1D Majorana channels in an iron-based superconductor

Abstract

The possible realization of Majorana fermions as quasiparticle excitations in condensed-matter physics has created much excitement. Most studies have focused on Majorana bound states; however, propagating Majorana states with linear dispersion have also been predicted. Here, we report scanning tunneling spectroscopic measurements of crystalline domain walls (DWs) in FeSe 0.45 Te 0.55 . We located DWs across which the lattice structure shifts by half a unit cell. These DWs have a finite, flat density of states inside the superconducting gap, which is a hallmark of linearly dispersing modes in one dimension. This signature is absent in DWs in the related superconductor, FeSe, which is not in the topological phase. Our combined data are consistent with the observation of dispersing Majorana states at a π-phase shift DW in a proximitized topological material.

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1580804
Grant/Contract Number:  
SC0014335; FG02-05ER46225
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 367 Journal Issue: 6473; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Zhenyu, Rodriguez, Jorge Olivares, Jiao, Lin, Howard, Sean, Graham, Martin, Gu, G. D., Hughes, Taylor L., Morr, Dirk K., and Madhavan, Vidya. Evidence for dispersing 1D Majorana channels in an iron-based superconductor. United States: N. p., 2020. Web. doi:10.1126/science.aaw8419.
Wang, Zhenyu, Rodriguez, Jorge Olivares, Jiao, Lin, Howard, Sean, Graham, Martin, Gu, G. D., Hughes, Taylor L., Morr, Dirk K., & Madhavan, Vidya. Evidence for dispersing 1D Majorana channels in an iron-based superconductor. United States. doi:10.1126/science.aaw8419.
Wang, Zhenyu, Rodriguez, Jorge Olivares, Jiao, Lin, Howard, Sean, Graham, Martin, Gu, G. D., Hughes, Taylor L., Morr, Dirk K., and Madhavan, Vidya. Thu . "Evidence for dispersing 1D Majorana channels in an iron-based superconductor". United States. doi:10.1126/science.aaw8419.
@article{osti_1580804,
title = {Evidence for dispersing 1D Majorana channels in an iron-based superconductor},
author = {Wang, Zhenyu and Rodriguez, Jorge Olivares and Jiao, Lin and Howard, Sean and Graham, Martin and Gu, G. D. and Hughes, Taylor L. and Morr, Dirk K. and Madhavan, Vidya},
abstractNote = {The possible realization of Majorana fermions as quasiparticle excitations in condensed-matter physics has created much excitement. Most studies have focused on Majorana bound states; however, propagating Majorana states with linear dispersion have also been predicted. Here, we report scanning tunneling spectroscopic measurements of crystalline domain walls (DWs) in FeSe 0.45 Te 0.55 . We located DWs across which the lattice structure shifts by half a unit cell. These DWs have a finite, flat density of states inside the superconducting gap, which is a hallmark of linearly dispersing modes in one dimension. This signature is absent in DWs in the related superconductor, FeSe, which is not in the topological phase. Our combined data are consistent with the observation of dispersing Majorana states at a π-phase shift DW in a proximitized topological material.},
doi = {10.1126/science.aaw8419},
journal = {Science},
number = 6473,
volume = 367,
place = {United States},
year = {2020},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aaw8419

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Works referenced in this record:

Superconducting properties of iron chalcogenide thin films
journal, October 2012


Iron-Based Superconductors as Odd-Parity Superconductors
journal, July 2013


Anyons in an exactly solved model and beyond
journal, January 2006


Colloquium : Majorana fermions in nuclear, particle, and solid-state physics
journal, February 2015


Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors
journal, May 2018

  • Kim, Howon; Palacio-Morales, Alexandra; Posske, Thore
  • Science Advances, Vol. 4, Issue 5
  • DOI: 10.1126/sciadv.aar5251

Symmetry and Topology in Superconductors –Odd-Frequency Pairing and Edge States–
journal, January 2012

  • Tanaka, Yukio; Sato, Masatoshi; Nagaosa, Naoto
  • Journal of the Physical Society of Japan, Vol. 81, Issue 1
  • DOI: 10.1143/JPSJ.81.011013

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


Non-Abelian Statistics of Half-Quantum Vortices in p -Wave Superconductors
journal, January 2001


Time-Reversal-Invariant Topological Superconductors and Superfluids in Two and Three Dimensions
journal, May 2009


Odd parity pairing and nodeless antiphase s ± in iron-based superconductors
journal, January 2014


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


Topological Superconductivity on the Surface of Fe-Based Superconductors
journal, July 2016


Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
journal, May 2011

  • Homes, Christopher C.; Akrap, Ana; Wen, Jinsheng
  • Journal of Physics and Chemistry of Solids, Vol. 72, Issue 5
  • DOI: 10.1016/j.jpcs.2010.10.014

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


Quantized charge transport in chiral Majorana edge modes
journal, November 2017


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


Search for Majorana Fermions in Superconductors
journal, April 2013


Observation of a robust zero-energy bound state in iron-based superconductor Fe(Te,Se)
journal, June 2015

  • Yin, J-X.; Wu, Zheng; Wang, J-H.
  • Nature Physics, Vol. 11, Issue 7
  • DOI: 10.1038/nphys3371

New directions in the pursuit of Majorana fermions in solid state systems
journal, June 2012


Chiral Majorana fermion modes in a quantum anomalous Hall insulator–superconductor structure
journal, July 2017


Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe 0.45 Te 0.55
journal, August 2017


Classification of topological insulators and superconductors in three spatial dimensions
journal, November 2008


End States and Subgap Structure in Proximity-Coupled Chains of Magnetic Adatoms
journal, November 2015


First Investigation of Pressure Effects on Transition from Superconductive to Metallic Phase in FeSe 0.5 Te 0.5
journal, June 2009

  • Horigane, Kazumasa; Takeshita, Nao; Lee, Chul-Ho
  • Journal of the Physical Society of Japan, Vol. 78, Issue 6
  • DOI: 10.1143/JPSJ.78.063705

Unconventional s-Wave Superconductivity in Fe(Se,Te)
journal, April 2010


Teoria simmetrica dell’elettrone e del positrone
journal, April 1937


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


Exponential protection of zero modes in Majorana islands
journal, March 2016

  • Albrecht, S. M.; Higginbotham, A. P.; Madsen, M.
  • Nature, Vol. 531, Issue 7593
  • DOI: 10.1038/nature17162

Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe 0.55 Se 0.45
journal, March 2012


Fault-tolerant quantum computation by anyons
journal, January 2003


Topological Phases in the Single-Layer FeSe
journal, September 2014


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


Discrete energy levels of Caroli-de Gennes-Matricon states in quantum limit in FeTe0.55Se0.45
journal, March 2018


Atomic-scale interface engineering of Majorana edge modes in a 2D magnet-superconductor hybrid system
journal, July 2019

  • Palacio-Morales, Alexandra; Mascot, Eric; Cocklin, Sagen
  • Science Advances, Vol. 5, Issue 7
  • DOI: 10.1126/sciadv.aav6600

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


Topological characters in Fe ( Te 1 x Se x ) thin films
journal, March 2016


Zero-bias peaks and splitting in an Al–InAs nanowire topological superconductor as a signature of Majorana fermions
journal, November 2012

  • Das, Anindya; Ronen, Yuval; Most, Yonatan
  • Nature Physics, Vol. 8, Issue 12
  • DOI: 10.1038/nphys2479

Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
journal, July 2010

  • Lawler, M. J.; Fujita, K.; Lee, Jhinhwan
  • Nature, Vol. 466, Issue 7304
  • DOI: 10.1038/nature09169

Helical Hinge Majorana Modes in Iron-Based Superconductors
journal, May 2019


Gap symmetry and structure of Fe-based superconductors
journal, October 2011


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