Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO3

Yuan, Bo; Khait, Ilia; Shu, Guo-Jiun; Chou, F.  C.; Stone, M.  B.; Clancy, J.  P.; Paramekanti, Arun; Kim, Young-June

doi:10.1103/physrevx.10.011062

Title: Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO₃

Journal Article · 12 March 2020 · Physical Review. X

DOI: https://doi.org/10.1103/physrevx.10.011062 · OSTI ID:1604508

^[1]; Khait, Ilia ^[1]; Shu, Guo-Jiun ^[2];

^[3];

^[4];

^[5]; Paramekanti, Arun ^[1];

^[1]

Univ. of Toronto, ON (Canada)
National Taipei Univ. of Technology, Taipei (Taiwan); National Taipei Univ. of Technology, Taipei (Taiwan). Inst. of Mineral Resources Engineering
National Taiwan Univ., Taipei (Taiwan). Center for Condensed Matter Sciences
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
McMaster Univ., Hamilton, ON (United States)

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.

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

Sponsoring Organization:: USDOE Office of Science (SC); Ministry of Education in Taiwan; Natural Science and Engineering Research Council (NSERC); Ministry of Science and Technology (MOST)

Grant/Contract Number:: AC05-00OR22725; 8-2622-8-002-016; 06-2119-M-002-035-MY3; 108L900903

OSTI ID:: 1604508

Alternate ID(s):: OSTI ID: 1666019

Journal Information:: Physical Review. X, Vol. 10, Issue 1; ISSN 2160-3308

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 68 works

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Title: Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO3

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Title: Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO₃