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arXiv 1711.02016cond-mat.str-el
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三角晶格上Kitaev模型的量子能隙和自旋波激发

Quantum gap and spin-wave excitations in the Kitaev model on a triangular lattice

Adolfo Avella, Andrea Di Ciolo, George Jackeli

摘要:

我们研究了量子涨落对带隙动态产生的影响以及对三角形晶格上受抑磁体自旋波谱的演化的影响,三角形晶格具有与键相关的伊辛耦合,类似于Kitaev蜂窝模型。量子涨落通过量子有序-无序机制提升了经典基态流形的次广延简并性。最近邻链保持解耦和幸存的离散简并的基态的保护由一个隐藏的模型对称性。我们展示了如何四自旋相互作用,涌现的波动,产生一个自旋间隙移动的节线的线性自旋波谱有限的能量。

英文摘要:

We study the effects of quantum fluctuations on the dynamical generation of a gap and on the evolution of the spin-wave spectra of a frustrated magnet on a triangular lattice with bond-dependent Ising couplings, analog of the Kitaev honeycomb model. The quantum fluctuations lift the subextensive degeneracy of the classical ground-state manifold by a quantum order-by-disorder mechanism. Nearest-neighbor chains remain decoupled and the surviving discrete degeneracy of the ground state is protected by a hidden model symmetry. We show how the four-spin interaction, emergent from the fluctuations, generates a spin gap shifting the nodal lines of the linear spin-wave spectrum to finite energies.

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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