Excitations in the field-induced quantum spin liquid state of α-RuCl3

Banerjee, Arnab; Kelley, Paula J.; Knolle, Johannes; Balz, Christian; Aczel, Adam A.; Winn, Barry L.; Liu, Yaohua; Pajerowski, Daniel M.; Yan, Jiaqiang; Bridges, Craig A.; Savici, Andrei T.; Chakoumakos, Bryan C.; Lumsden, Mark D.; Tennant, David Alan; Moessner, Roderich; Mandrus, David; Nagler, Stephen E.

doi:10.1038/s41535-018-0079-2

Title: Excitations in the field-induced quantum spin liquid state of α-RuCl₃

Journal Article · 20 February 2018 · npj Quantum Materials

DOI: https://doi.org/10.1038/s41535-018-0079-2 · OSTI ID:1423077

Banerjee, Arnab ^[1]; Kelley, Paula J. ^[2]; Knolle, Johannes ^[3]; Balz, Christian ^[1]; Aczel, Adam A. ^[1]; Winn, Barry L. ^[1]; Liu, Yaohua ^[1]; Pajerowski, Daniel M. ^[1]; Yan, Jiaqiang ^[2]; Bridges, Craig A. ^[4]; Savici, Andrei T. ^[5]; Chakoumakos, Bryan C. ^[1]; Lumsden, Mark D. ^[1]; Tennant, David Alan ^[1]; Moessner, Roderich ^[6]; Mandrus, David ^[2]; Nagler, Stephen E. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Univ. of Cambridge (United Kingdom). Cavendish Lab., Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
Max Planck Inst. for the Physics of Complex Systems, Dresden (Germany)

The celebrated Kitaev quantum spin liquid (QSL) is the paradigmatic example of a topological magnet with emergent excitations in the form of Majorana Fermions and gauge fluxes. Upon breaking of time-reversal symmetry, for example in an external magnetic field, these fractionalized quasiparticles acquire non-Abelian exchange statistics, an important ingredient for topologically protected quantum computing. Consequently, there has been enormous interest in exploring possible material realizations of Kitaev physics and several candidate materials have been put forward, recently including α-RuCl₃. In the absence of a magnetic field this material orders at a finite temperature and exhibits low-energy spin wave excitations. However, at moderate energies, the spectrum is unconventional and the response shows evidence for fractional excitations. Here in this paper, we use time-of-flight inelastic neutron scattering to show that the application of a sufficiently large magnetic field in the honeycomb plane suppresses the magnetic order and the spin waves, leaving a gapped continuum spectrum of magnetic excitations. Our comparisons of the scattering to the available calculations for a Kitaev QSL show that they are consistent with the magnetic field induced QSL phase.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1423077

Journal Information:: npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 3; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Magnetic field induced competing phases in spin-orbital entangled Kitaev magnets Chern, Li Ern; Kaneko, Ryui; Lee, Hyun-Yong Physical Review Research, Vol. 2, Issue 1 https://doi.org/10.1103/physrevresearch.2.013014	journal	January 2020
Field-induced QCD 3 -Chern-Simons quantum criticalities in Kitaev materials Zou, Liujun; He, Yin-Chen Physical Review Research, Vol. 2, Issue 1 https://doi.org/10.1103/physrevresearch.2.013072	journal	January 2020
Approximately Quantized Thermal Hall Effect of Chiral Liquids Coupled to Phonons Vinkler-Aviv, Yuval; Rosch, Achim Physical Review X, Vol. 8, Issue 3 https://doi.org/10.1103/physrevx.8.031032	journal	August 2018
Quantum robustness and phase transitions of the 3D Toric Code in a field Reiss, David A.; Schmidt, Kai Phillip Freie Universität Berlin https://doi.org/10.17169/refubium-26496	text	January 2019
Magnetic anisotropy of the alkali iridate Na2IrO3 at high magnetic fields: Evidence for strong ferromagnetic Kitaev correlations Das, Sd; Kundu, S.; Zhu, Z. Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.37427	text	January 2019
Quantum robustness and phase transitions of the 3D Toric Code in a field Reiss, David A.; Schmidt, Kai P. SciPost Physics, Vol. 6, Issue 6 https://doi.org/10.21468/scipostphys.6.6.078	journal	January 2019
Pressure-Tuned Interactions in Frustrated Magnets: Pathway to Quantum Spin Liquids? Biesner, Tobias; Uykur, Ece Crystals, Vol. 10, Issue 1 https://doi.org/10.3390/cryst10010004	journal	December 2019
Uniaxial and hydrostatic pressure effects in alpha-RuCl3 single crystals via thermal-expansion measurements He, Mingquan; Wang, Xiao; Wang, Liran arXiv https://doi.org/10.48550/arxiv.1712.08511	text	January 2017
Dynamical and Topological Properties of the Kitaev Model in a [111] Magnetic Field Gohlke, Matthias; Moessner, Roderich; Pollmann, Frank arXiv https://doi.org/10.48550/arxiv.1804.06811	text	January 2018
Successive Majorana Topological Transitions Driven by a Magnetic Field in the Kitaev Model Nasu, Joji; Kato, Yasuyuki; Kamiya, Yoshitomo arXiv https://doi.org/10.48550/arxiv.1805.02423	text	January 2018
Signatures of magnetic-field-driven quantum phase transitions in the entanglement entropy and spin dynamics of the Kitaev honeycomb model Ronquillo, David C.; Vengal, Adu; Trivedi, Nandini arXiv https://doi.org/10.48550/arxiv.1805.03722	text	January 2018
Two-step gap opening across the quantum critical point in a Kitaev honeycomb magnet Nagai, Y.; Jinno, T.; Yoshitake, Y. arXiv https://doi.org/10.48550/arxiv.1810.05379	text	January 2018
Gapless Kitaev Spin Liquid to Classical String Gas through Tensor Networks Lee, Hyun-Yong; Kaneko, Ryui; Okubo, Tsuyoshi arXiv https://doi.org/10.48550/arxiv.1901.05786	text	January 2019
Abelian and non-Abelian chiral spin liquids in a compact tensor network representation Lee, Hyun-Yong; Kaneko, Ryui; Okubo, Tsuyoshi arXiv https://doi.org/10.48550/arxiv.1907.02268	text	January 2019
Observation of two types of fractional excitation in the Kitaev honeycomb magnet Jansa, N.; Zorko, A.; Gomilsek, M. Nature Publishing Group https://doi.org/10.7892/boris.118887	text	January 2018

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36 MATERIALS SCIENCE
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Title: Excitations in the field-induced quantum spin liquid state of α-RuCl3

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Title: Excitations in the field-induced quantum spin liquid state of α-RuCl₃