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arXiv 1502.01950cond-mat.mes-hall
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量子涨落稳定了Skyrmion纹理

Quantum fluctuations stabilize Skyrmion textures

A. Roldán-Molina, M. J. Santander, Á. S. Núñez, J. Fernández-Rossier

摘要:

在这里,我们表明,与非共线自旋织构的量子自旋涨落相关的零点能量产生类卡西米尔磁场。我们研究这些Casimir领域的拓扑保护的非共线自旋纹理称为skyrmions的效果。我们计算零点能量,在自旋波展开的最低阶,在海森堡模型与Dzyalonshinkii-Moriya相互作用选择,使经典的基态显示skyrmion纹理,消失后,应用足够强的磁场。我们的计算表明,Casimir磁场贡献了总塞曼能量的10%,所需删除的skyrmion纹理与外加场,从而是一个可观察到的效果。

英文摘要:

Here we show that the zero point energy associated to the quantum spin fluctuations of a non- collinear spin texture produce Casimir-like magnetic fields. We study the effect of these Casimir fields on the topologically protected non-collinear spin textures known as skyrmions. We calculate the zero point energy, to the lowest order in the spin wave expansion, in a Heisenberg model with Dzyalonshinkii-Moriya interactions chosen so that the classical ground state displays skyrmion textures, that disappear upon application of a strong enough magnetic field. Our calculations show that the Casimir magnetic field contributes a 10 percent of the total Zeeman energy necessary to delete the skyrmion texture with an applied field, and is thereby an observable effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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