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首页> 外文期刊>Ferroelectrics: Letters Section >Bose-Einstein and BCS Pairs on a 2D Lattice: Pair Symmetry, Topology and Experimental Ramifications
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Bose-Einstein and BCS Pairs on a 2D Lattice: Pair Symmetry, Topology and Experimental Ramifications

机译:二维格子上的Bose-Einstein和BCS对:对对称性,拓扑结构和实验分支

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摘要

We study features of weakly-coupled BCS and strongly-coupled BE pair states for d_(x~2-y~2) and extended-s (s*) symmetries on a 2D lattice with on-site repulsion U, and nearest-neigh-bor attraction V. We explore the topological nature of the pair regimes. At arbitrary filling, we find that unlike the s* case, for d_(x~2-y~2) symmetry, the BE and BCS regimes are topologically distinct, suggesting a topological phase transition. This is manifested in the electron distribution function u_k~2 in v_k/u_k, and in their Fourier transforms. We discuss experimental ramifications of our findings.
机译:我们研究了具有排斥力U和最近邻的2D晶格上d_(x〜2-y〜2)和扩展s(s *)对称性的弱耦合BCS和强耦合BE对状态的特征-bor吸引力V。我们探索了配对方案的拓扑性质。在任意填充下,我们发现与s *情况不同,对于d_(x〜2-y〜2)对称性,BE和BCS机制在拓扑上是不同的,表明拓扑相变。这在v_k / u_k中的电子分布函数u_k〜2及其傅里叶变换中得到体现。我们讨论了我们发现的实验结果。

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