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arXiv 0905.0877cond-mat.stat-mechcond-mat.quant-gasquant-ph
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O(N)破缺量子猝灭:拓扑缺陷与准粒子

O(N) symmetry-breaking quantum quench: Topological defects versus quasiparticles

Michael Uhlmann, Ralf Schützhold, Uwe R. Fischer

摘要:

我们提出了一个解析推导的缠绕数计数拓扑缺陷所产生的O(N)破缺量子淬火在N个空间维度。我们的方法是通用的,在这个意义上,我们不采用任何近似除了大$N$限制。最后的结果在N中是非微扰的,即,它不能通过通常的1/N展开得到,并且我们得到的拓扑缺陷比准粒子激发少得多,这与以前的低维研究截然不同。

英文摘要:

We present an analytical derivation of the winding number counting topological defects created by an O(N) symmetry-breaking quantum quench in N spatial dimensions. Our approach is universal in the sense that we do not employ any approximations apart from the large-$N$ limit. The final result is nonperturbative in N, i.e., it cannot be obtained by %the usual an expansion in 1/N, and we obtain far less topological defects than quasiparticle excitations, in sharp distinction to previous, low-dimensional investigations.

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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