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Title: Magnon Dirac materials

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1280179
Grant/Contract Number:
BES E304
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 7; Related Information: CHORUS Timestamp: 2016-08-01 18:09:18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Fransson, J., Black-Schaffer, A. M., and Balatsky, A. V.. Magnon Dirac materials. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.075401.
Fransson, J., Black-Schaffer, A. M., & Balatsky, A. V.. Magnon Dirac materials. United States. doi:10.1103/PhysRevB.94.075401.
Fransson, J., Black-Schaffer, A. M., and Balatsky, A. V.. 2016. "Magnon Dirac materials". United States. doi:10.1103/PhysRevB.94.075401.
@article{osti_1280179,
title = {Magnon Dirac materials},
author = {Fransson, J. and Black-Schaffer, A. M. and Balatsky, A. V.},
abstractNote = {},
doi = {10.1103/PhysRevB.94.075401},
journal = {Physical Review B},
number = 7,
volume = 94,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.94.075401

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • Effects of hopping disorder in the Mott-Hubbard antiferromagnet are studied, both perturbatively and also using the exact-eigenstate method, in the strong correlation limit. It is shown that while the low-energy, long-wavelength magnon modes are only weakly affected, the high-energy modes are strongly affected because of a cooperative effect arising from local correlations in hopping disorder. Implications of this highly asymmetric magnon-energy renormalization for two-magnon Raman scattering in cuprate antiferromagnets are also discussed. {copyright} {ital 1997} {ital The American Physical Society}
  • Systems that exhibit topologically protected edge states are interesting both from a fundamental point of view as well as for potential applications, the latter because of the absence of backscattering and robustness to perturbations. It is desirable to be able to control and manipulate such edge states. Here, we demonstrate using a semi-analytical model that artificial square ices can incorporate both features: an interfacial Dzyaloshinksii-Moriya gives rise to topologically non-trivial magnon bands, and the equilibrium state of the spin ice is reconfigurable with different states having different magnon dispersions and topology. Micromagnetic simulations are used to determine the magnetization equilibriummore » states and to validate the semi-analytical model. Lastly, our results are amenable to experimental verification via, e.g., lithographic patterning and micro-focused Brillouin light scattering.« less
  • Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (T{sub C}'s) of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical double exchange mechanism. From the wave-vector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical-phonon modes, we argue that a strong magnetoelastic (magnon-phonon) coupling is responsible for the observed low-temperature anomalous spin dynamical behavior of the manganites. (c) 2000 The Americanmore » Physical Society.« less
  • The method of equations of motion for spin operators in the case of O(3) Heisenberg ferromagnet is systematically analyzed starting from the effective Lagrangian. It is shown that the random phase approximation and the Callen approximation can be understood in terms of perturbation theory for type B magnons. Also, the second order approximation of Kondo and Yamaji for one dimensional ferromagnet is reduced to the perturbation theory for type A magnons. An emphasis is put on the physical picture, i.e. on magnon–magnon interactions and symmetries of the Heisenberg model. Calculations demonstrate that all three approximations differ in manner in which themore » magnon–magnon interactions arising from the Wess–Zumino term are treated, from where specific features and limitations of each of them can be deduced.« less