open access

https://hdl.handle.net/2115/83127

Optical Observation of Quasiperiodic Heisenberg Antiferromagnets in Two Dimensions

英語

spin-wave theory

2020-11

Wiley-Blackwell

Physica status solidi B-basic solid state physics

257(11)

2000118

A spin-wave analysis of magnetic Raman scattering in an antiferromagnetic Heisenberg model on the 2D Penrose lattice ofC5vpoint symmetry is made. Following the Shastry-Shraiman perturbation scheme for a strongly correlated Hubbard model, fourth-order effective Raman operators are obtained. Within the second-order mechanism, there is one and only Raman active mode ofE2symmetry, yielding a spectral weight independent of light polarization. Considering the fourth-order scatterings as well, activatesA1andA2as well asE2modes and therefore results in polarization-dependent Raman spectra. With the use of linearly and circularly polarized lights, all the symmetry species can separately be extracted from observations. Though the linear spin-wave theory, i.e., the harmonic oscillator approximation, is far from quantitative, theA2andE2Raman intensities are well describable with two magnon interactions. The Raman-activeA1mode owes much to higher-order magnon-magnon interactions as well.

学術雑誌論文

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This is the peer reviewed version of the following article:Physica status solidi B-basic solid state physics 2000118 July 2020, 2000118 which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1002/pssb.202000118. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

0370-1972