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Title: Neutron scattering in the proximate quantum spin liquid α-RuCl 3

The Kitaev quantum spin liquid (KQSL) is an exotic emergent state of matter exhibiting Majorana Fermion and gauge flux excitations. The magnetic insulator α-RuCl 3 is thought to realize a proximate KQSL. Here, we use neutron scattering on single crystals of α-RuCl 3 to reconstruct dynamical correlations in energy-momentum space. We discover highly unusual signals, including a column of scattering over a large energy interval around the Brillouin zone center which is very stable with temperature. This finding is consistent with scattering from the Majorana excitations of a KQSL. Other, more delicate,experimental features can be transparently associated with perturbations to an ideal model. Our results encourage further study of this prototypical material and may open a window into investigating emergent magnetic Majorana fermions in correlated materials.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [3] ; ORCiD logo [1] ; ORCiD logo [4] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Cambridge (United Kingdom). Cavendish Lab.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Max Planck Society, Dresden (Germany). Max Planck Inst. for the Physics of Complex Systems
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 290202
Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 356; Journal Issue: 6342; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1434387
Alternate Identifier(s):
OSTI ID: 1476432

Banerjee, Arnab, Yan, Jiaqiang, Knolle, Johannes, Bridges, Craig A., Stone, Matthew B., Lumsden, Mark D., Mandrus, David G., Tennant, David A., Moessner, Roderich, and Nagler, Stephen E.. Neutron scattering in the proximate quantum spin liquid α-RuCl 3. United States: N. p., Web. doi:10.1126/science.aah6015.
Banerjee, Arnab, Yan, Jiaqiang, Knolle, Johannes, Bridges, Craig A., Stone, Matthew B., Lumsden, Mark D., Mandrus, David G., Tennant, David A., Moessner, Roderich, & Nagler, Stephen E.. Neutron scattering in the proximate quantum spin liquid α-RuCl 3. United States. doi:10.1126/science.aah6015.
Banerjee, Arnab, Yan, Jiaqiang, Knolle, Johannes, Bridges, Craig A., Stone, Matthew B., Lumsden, Mark D., Mandrus, David G., Tennant, David A., Moessner, Roderich, and Nagler, Stephen E.. 2017. "Neutron scattering in the proximate quantum spin liquid α-RuCl 3". United States. doi:10.1126/science.aah6015.
@article{osti_1434387,
title = {Neutron scattering in the proximate quantum spin liquid α-RuCl 3},
author = {Banerjee, Arnab and Yan, Jiaqiang and Knolle, Johannes and Bridges, Craig A. and Stone, Matthew B. and Lumsden, Mark D. and Mandrus, David G. and Tennant, David A. and Moessner, Roderich and Nagler, Stephen E.},
abstractNote = {The Kitaev quantum spin liquid (KQSL) is an exotic emergent state of matter exhibiting Majorana Fermion and gauge flux excitations. The magnetic insulator α-RuCl3 is thought to realize a proximate KQSL. Here, we use neutron scattering on single crystals of α-RuCl3 to reconstruct dynamical correlations in energy-momentum space. We discover highly unusual signals, including a column of scattering over a large energy interval around the Brillouin zone center which is very stable with temperature. This finding is consistent with scattering from the Majorana excitations of a KQSL. Other, more delicate,experimental features can be transparently associated with perturbations to an ideal model. Our results encourage further study of this prototypical material and may open a window into investigating emergent magnetic Majorana fermions in correlated materials.},
doi = {10.1126/science.aah6015},
journal = {Science},
number = 6342,
volume = 356,
place = {United States},
year = {2017},
month = {6}
}