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arXiv 1503.02503cond-mat.quant-gasquant-ph
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相互作用玻色子反演对称系统中的拓扑Bogoliubov激发

Topological Bogoliubov excitations in inversion-symmetric systems of interacting bosons

G. Engelhardt, T. Brandes

摘要:

在玻色-爱因斯坦凝聚体的平均场分析之上,人们通常应用博戈留波夫理论来分析激发模的量子涨落。因此,必须以辛的方式对角化Bogoliubov哈密顿量。在我们的文章中,我们调查这些Bogoliubov激发的相互作用玻色子的反转不变系统的拓扑结构。我们分析了凝聚体如何影响Bogoliubov激发的拓扑结构。类似于费米子的情况下,在这里,我们建立了一个辛扩展的极化特征的拓扑结构的Bogoliubov激发和链接到反演算子的特征值在反演不变动量。我们还证明了一个有指导意义的,但实验上可行的例子,这个数量也与边缘状态的激发光谱。

英文摘要:

On top of the mean-field analysis of a Bose-Einstein condensate, one typically applies the Bogoliubov theory to analyze quantum fluctuations of the excited modes. Therefore, one has to diagonalize the Bogoliubov Hamiltonian in a symplectic manner. In our article we investigate the topology of these Bogoliubov excitations in inversion-invariant systems of interacting bosons. We analyze how the condensate influences the topology of the Bogoliubov excitations. Analogously to the fermionic case, here we establish a symplectic extension of the polarization characterizing the topology of the Bogoliubov excitations and link it to the eigenvalues of the inversion operator at the inversion-invariant momenta. We also demonstrate an instructive but experimentally feasible example that this quantity is also related to edge states in the excitation spectrum.

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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