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arXiv 2103.09828cond-mat.str-el
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Kitaev自旋液体中的光学声子

Optical phonons coupled to a Kitaev spin liquid

A. Metavitsiadis, W. Natori, J. Knolle, W. Brenig

摘要:

受抑磁体中的涌现激发连续谱是一种分馏指纹,是量子自旋液体态的特征。最近的拉曼散射证据表明,在假定的Kitaev磁体[1-6]中,这种连续自由度和晶格自由度之间存在耦合,这可能有助于深入了解分馏准粒子的性质。在这里,我们研究耦合到底层$\mathbb{Z}_{2}$量子自旋液体的光学声子的重整化。我们发现,声子线型获得的不对称性,可观察到的光散射,并从两个不同的来源,即分散的马约拉纳连续和法诺效应。此外,我们发现声子寿命随温度的增加而增加,由于可用相空间的热阻塞。最后,与低能探针相比,光学声子重整化对热激发规范通量相当不敏感,几乎不受外部磁场的影响。

英文摘要:

Emergent excitation continua in frustrated magnets are a fingerprint of fractionalization, characteristic of quantum spin-liquid states. Recent evidence from Raman scattering for a coupling between such continua and lattice degrees of freedom in putative Kitaev magnets [1-6] may provide insight into the nature of the fractionalized quasiparticles. Here we study the renormalization of optical phonons coupled to the underlying $\mathbb{Z}_{2}$ quantum spin-liquid. We show that phonon line-shapes acquire an asymmetry, observable in light scattering, and originating from two distinct sources, namely the dispersion of the Majorana continuum and the Fano effect. Moreover, we find that the phonon life-times increase with increasing temperature due to thermal blocking of available phase space. Finally, in contrast to low-energy probes, optical phonon renormalization is rather insensitive to thermally excited gauge fluxes and barely susceptible to external magnetic fields.

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