Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO3
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) kago...
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| creator | Yuan, Bo Khait, Ilia Guo-Jiun Shu Chou, F C Stone, M B Clancy, J P Paramekanti, Arun Young-June, Kim |
| description | 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 crystalCrI3, and in a 3D Heisenberg magnetCu3TeO6. Here, we report our inelastic neutron scattering investigation on a large single crystal of a stacked honeycomb lattice magnetCoTiO3, which is part of a broad family of ilmenite materials. The magnetically ordered ground state ofCoTiO3features ferromagnetic layers ofCo2+, stacked antiferromagnetically along thecaxis. 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 establishCoTiO3as a model pseudospin-1/2material to study interacting Dirac bosons in a 3D quantumXYmagnet. |
| doi_str_mv | 10.1103/PhysRevX.10.011062 |
| format | Article |
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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 crystalCrI3, and in a 3D Heisenberg magnetCu3TeO6. Here, we report our inelastic neutron scattering investigation on a large single crystal of a stacked honeycomb lattice magnetCoTiO3, which is part of a broad family of ilmenite materials. The magnetically ordered ground state ofCoTiO3features ferromagnetic layers ofCo2+, stacked antiferromagnetically along thecaxis. 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. 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| subjects | Anisotropy Antiferromagnetism Bosons Brillouin zones Condensed matter physics Crystal lattices Electrons Fermions Ferromagnetic materials Graphene Ground state Ilmenite Inelastic scattering Ising model Kagome lattice Magnons Momentum Neutron scattering Particle physics Pauli exclusion principle Physicists Single crystals |
| title | Dirac Magnons in a Honeycomb Lattice Quantum XY Magnet CoTiO3 |
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