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arXiv 1801.00769cond-mat.str-el
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具有长程相互作用的量子自旋链中的准粒子

Quasiparticles in quantum spin chains with long-range interactions

Laurens Vanderstraeten, Maarten Van Damme, Hans Peter Büchler, Frank Verstraete

摘要:

利用变分矩阵乘积态方法研究了具有长程相互作用的量子自旋链的准粒子激发。它被证实,本地准粒子ananalogue是能够捕获这些激发非常准确,即使当相关长度变得非常大,在拓扑非平凡的激发,如自旋的情况下。它表明,打破的Lieb-Robinson约束如下从尖点的外观中的色散关系,并给出证据,为不同的准粒子之间的交叉作为远程相互作用的调谐。

英文摘要:

We study quasiparticle excitations for quantum spin chains with long-range interactions using variational matrix product state techniques. It is confirmed that the local quasiparticle ansatz is able to capture those excitations very accurately, even when the correlation length becomes very large and in the case of topological nontrivial excitation such as spinons. It is demonstrated that the breaking of the Lieb-Robinson bound follows from the appearance of cusps in the dispersion relation, and evidence is given for a crossover between different quasiparticles as the long-range interactions are tuned.

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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