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Title: Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO 3

Abstract

The discovery of massless Dirac electrons in graphene and topological Dirac-Weyl materials has prompted a broad search for bosonic analogues of such Dirac particles. Recent experiments have found evidence for Dirac magnons above an Ising-like ferromagnetic ground state in a two-dimensional (2D) kagome lattice magnet and in the van der Waals layered honeycomb crystal CrI3, and in a 3D Heisenberg magnet Cu3TeO6. Here, we report our inelastic neutron scattering investigation on a large single crystal of a stacked honeycomb lattice magnet CoTiO3, which is part of a broad family of ilmenite materials. The magnetically ordered ground state of CoTiO3 features ferromagnetic layers of Co2+, stacked antiferromagnetically along the c axis. The magnon dispersion relation is described very well with a simple magnetic Hamiltonian with strong easy-plane exchange anisotropy. Importantly, a magnon Dirac cone is found along the edge of the 3D Brillouin zone. Our results establish CoTiO3 as a model pseudospin-1/2 material to study interacting Dirac bosons in a 3D quantum XY magnet.

Authors:
ORCiD logo; ; ; ORCiD logo; ORCiD logo; ORCiD logo; ; ORCiD logo
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Ministry of Education in Taiwan; Natural Science and Engineering Research Council (NSERC); Ministry of Science and Technology (MOST)
OSTI Identifier:
1604508
Alternate Identifier(s):
OSTI ID: 1666019
Grant/Contract Number:  
AC05-00OR22725; 8-2622-8-002-016; 06-2119-M-002-035-MY3; 108L900903
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 10 Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnons; symmetry protected topological states; magnetic insulators; inelastic neutron scattering

Citation Formats

Yuan, Bo, Khait, Ilia, Shu, Guo-Jiun, Chou, F. C., Stone, M. B., Clancy, J. P., Paramekanti, Arun, and Kim, Young-June. Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO 3. United States: N. p., 2020. Web. doi:10.1103/PhysRevX.10.011062.
Yuan, Bo, Khait, Ilia, Shu, Guo-Jiun, Chou, F. C., Stone, M. B., Clancy, J. P., Paramekanti, Arun, & Kim, Young-June. Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO 3. United States. doi:https://doi.org/10.1103/PhysRevX.10.011062
Yuan, Bo, Khait, Ilia, Shu, Guo-Jiun, Chou, F. C., Stone, M. B., Clancy, J. P., Paramekanti, Arun, and Kim, Young-June. Thu . "Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO 3". United States. doi:https://doi.org/10.1103/PhysRevX.10.011062.
@article{osti_1604508,
title = {Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO 3},
author = {Yuan, Bo and Khait, Ilia and Shu, Guo-Jiun and Chou, F. C. and Stone, M. B. and Clancy, J. P. and Paramekanti, Arun and Kim, Young-June},
abstractNote = {The discovery of massless Dirac electrons in graphene and topological Dirac-Weyl materials has prompted a broad search for bosonic analogues of such Dirac particles. Recent experiments have found evidence for Dirac magnons above an Ising-like ferromagnetic ground state in a two-dimensional (2D) kagome lattice magnet and in the van der Waals layered honeycomb crystal CrI3, and in a 3D Heisenberg magnet Cu3TeO6. Here, we report our inelastic neutron scattering investigation on a large single crystal of a stacked honeycomb lattice magnet CoTiO3, which is part of a broad family of ilmenite materials. The magnetically ordered ground state of CoTiO3 features ferromagnetic layers of Co2+, stacked antiferromagnetically along the c axis. The magnon dispersion relation is described very well with a simple magnetic Hamiltonian with strong easy-plane exchange anisotropy. Importantly, a magnon Dirac cone is found along the edge of the 3D Brillouin zone. Our results establish CoTiO3 as a model pseudospin-1/2 material to study interacting Dirac bosons in a 3D quantum XY magnet.},
doi = {10.1103/PhysRevX.10.011062},
journal = {Physical Review. X},
number = 1,
volume = 10,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1103/PhysRevX.10.011062

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Cited by: 3 works
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