Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3

Chen, Lebing; Stone, Matthew B.; Kolesnikov, Alexander I.; Winn, Barry; Shon, Wonhyuk; Dai, Pengcheng; Chung, Jae-Ho

doi:10.1088/2053-1583/ac2e7a

Title: Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl ₃

Abstract

Two dimensional van der Waals ferromagnets with honeycomb structures are expected to host the bosonic version of Dirac particles in their magnon excitation spectra. Using inelastic neutron scattering, we study spin wave excitations in polycrystalline CrCl₃, which exhibits ferromagnetic honeycomb layers with antiferromagnetic stackings along the c-axis. For comparison, polycrystal samples of CrI₃ with different grain sizes are also studied. We find that the powder-averaged spin wave spectrum of CrCl₃ at T = 2 K can be adequately explained by the two dimensional spin Hamiltonian including in-plane Heisenberg exchanges only. Additionally, the observed excitation does not exhibit noticeable broadening in energy, which is in remarkable contrast to the substantial broadening observed in CrI₃. Based on these results, we conclude that the ferromagnetic phase of CrCl₃ hosts massless Dirac magnons and is thus not topological.

Authors:

Chen, Lebing;

;

; Winn, Barry;

;

Publication Date:: 2021-10-27

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE; National Research Foundation of Korea (NRF)

OSTI Identifier:: 1828078

Alternate Identifier(s):: OSTI ID: 1825339; OSTI ID: 1841474

Grant/Contract Number:: NSF-DMR-1700081; AC05-00OR22725; SC0012311; 2020R1A5A1016518; 2020K1A3A7A09077712

Resource Type:: Published Article

Journal Name:: 2D Materials

Additional Journal Information:: Journal Name: 2D Materials Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2053-1583

Publisher:: IOP Publishing

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE; van der Waals materials; honeycomb lattice; ferromagnet; neutron scattering; magnons

Citation Formats


                    Chen, Lebing, Stone, Matthew B., Kolesnikov, Alexander I., Winn, Barry, Shon, Wonhyuk, Dai, Pengcheng, and Chung, Jae-Ho. Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3.  United Kingdom: N. p., 2021. 
Web.  doi:10.1088/2053-1583/ac2e7a.

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                    Chen, Lebing, Stone, Matthew B., Kolesnikov, Alexander I., Winn, Barry, Shon, Wonhyuk, Dai, Pengcheng, & Chung, Jae-Ho. Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3.  United Kingdom.  https://doi.org/10.1088/2053-1583/ac2e7a

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                    Chen, Lebing, Stone, Matthew B., Kolesnikov, Alexander I., Winn, Barry, Shon, Wonhyuk, Dai, Pengcheng, and Chung, Jae-Ho. Wed .  
"Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3".  United Kingdom.  https://doi.org/10.1088/2053-1583/ac2e7a.

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@article{osti_1828078,

  title        = {Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3},

  author       = {Chen, Lebing and Stone, Matthew B. and Kolesnikov, Alexander I. and Winn, Barry and Shon, Wonhyuk and Dai, Pengcheng and Chung, Jae-Ho},

  abstractNote = {Two dimensional van der Waals ferromagnets with honeycomb structures are expected to host the bosonic version of Dirac particles in their magnon excitation spectra. Using inelastic neutron scattering, we study spin wave excitations in polycrystalline CrCl3, which exhibits ferromagnetic honeycomb layers with antiferromagnetic stackings along the c-axis. For comparison, polycrystal samples of CrI3 with different grain sizes are also studied. We find that the powder-averaged spin wave spectrum of CrCl3 at T = 2 K can be adequately explained by the two dimensional spin Hamiltonian including in-plane Heisenberg exchanges only. Additionally, the observed excitation does not exhibit noticeable broadening in energy, which is in remarkable contrast to the substantial broadening observed in CrI3. Based on these results, we conclude that the ferromagnetic phase of CrCl3 hosts massless Dirac magnons and is thus not topological.},

  doi          = {10.1088/2053-1583/ac2e7a},

  journal      = {2D Materials},

  number       = 1,

  volume       = 9,

  place        = {United Kingdom},

  year         = {2021},

  month        = {10}

}

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Title: Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl 3

Abstract

Citation Formats

Enhancement of the Magnetic Coupling in Exfoliated CrCl 3 Crystals Observed by Low‐Temperature Magnetic Force Microscopy and X‐ray Magnetic Circular Dichroism journal, May 2020

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Title: Massless Dirac magnons in the two dimensional van der Waals honeycomb magnet CrCl ₃

Enhancement of the Magnetic Coupling in Exfoliated CrCl ₃ Crystals Observed by Low‐Temperature Magnetic Force Microscopy and X‐ray Magnetic Circular Dichroism
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