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arXiv 1708.02508cond-mat.quant-gasmath-phmath.MP
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平带系统中硬核玻色子对的形成

Pair formation of hard core bosons in flat band systems

Andreas Mielke

摘要:

一大类一维或二维平带系统中的硬核玻色子都有一个上临界密度,低于这个密度,基态就能得到完整的描述。在临界密度下,基态为维格纳晶体。如果在临界密度下向系统中加入一个粒子,系统的基态和多粒子低能级可以描述为一个附加粒子对的Wigner晶体。该对的能带与多粒子光谱的其余部分分离。证明使用格施戈林类型的块对角占优矩阵的参数。在某些一维或树状结构中,我们可以证明该对是局部化的,例如在棋盘链中。对于具有周期边界条件的一维系统,该对的能带是平坦的,该对是局域化的。

英文摘要:

Hard core bosons in a large class of one or two dimensional flat band systems have an upper critical density, below which the ground states can be described completely. At the critical density, the ground states are Wigner crystals. If one adds a particle to the system at the critical density, the ground state and the low lying multi particle states of the system can be described as a Wigner crystal with an additional pair of particles. The energy band for the pair is separated from the rest of the multi-particle spectrum. The proofs use a Gerschgorin type of argument for block diagonally dominant matrices. In certain one-dimensional or tree-like structures one can show that the pair is localised, for example in the chequerboard chain. For this one-dimensional system with periodic boundary condition the energy band for the pair is flat, the pair is localised.

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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