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arXiv 1406.6969quant-phcond-mat.quant-gas
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超冷原子量子系统的广义Kronig-Penney模型

Generalised Kronig-Penney model for ultracold atomic quantum systems

A. Negretti, R. Gerritsma, Z. Idziaszek, F. Schmidt-Kaler, T. Calarco

摘要:

研究了量子粒子与一维等距离散射中心结构相互作用的性质。我们推导出的色散关系和布洛赫函数的解析表达式中存在的奇偶散射波的赝势近似。这推广了著名的固体物理教科书的结果被称为克罗尼格-彭尼模型。我们的广义模型可以用来描述系统,如简并费米气体与离子或与另一个中性原子物种限制在一个光晶格,从而使极化子或近藤物理的调查在一个简单的形式主义。我们把注意力集中在特定的原子-离子系统,并将我们的研究结果与量子亏损理论进行比较。在赝势近似的有效性范围内获得了很好的一致性。这使我们能够推导出一个线性离子链中的简并量子玻色气体的玻色-哈伯德哈密顿量。

英文摘要:

We study the properties of a quantum particle interacting with a one dimensional structure of equidistant scattering centres. We derive an analytical expression for the dispersion relation and for the Bloch functions in the presence of both even and odd scattering waves within the pseudopotential approximation. This generalises the well-known solid-state physics text-book result known as the Kronig-Penney model. Our generalised model can be used to describe systems such as degenerate Fermi gases interacting with ions or with another neutral atomic species confined in an optical lattice, thus enabling the investigation of polaron or Kondo physics within a simple formalism. We focus our attention on the specific atom-ion system and compare our findings with quantum defect theory. Excellent agreement is obtained within the regime of validity of the pseudopotential approximation. This enables us to derive a Bose-Hubbard Hamiltonian for a degenerate quantum Bose gas in a linear chain of ions.

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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