Dimensionality-induced BCS-BEC crossover in layered superconductors
Dimensionality-induced BCS-BEC crossover in layered superconductors
复制标题
层状超导体中维度引起的 BCS-BEC 交叉
DOI：
10.1103/physrevb.98.184502
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Ryusuke Ikeda
中科院分区：
文献类型：
--
作者：
Kyosuke Adachi;Ryusuke Ikeda
基于具有强吸引相互作用的层状超导体的简单模型，我们发现层间跳变越小，对凝结温度和对形成温度的分离就越明显。我们从这一结果中提出了由维度变化引起的BCS-BEC交叉，例如，由于插入额外的绝缘层或施加单轴压力。验证了态电子密度中赝隙的出现，这支持了维数诱导BCS-BEC交叉的想法。
Based on a simple model of a layered superconductor with strong attractive interaction, we find that the separation of the pair-condensation temperature from the pair-formation temperature becomes more remarkable as the interlayer hopping gets smaller. We propose from this result the BCS-BEC crossover induced by the change in dimensionality, for instance, due to insertion of additional insulating layers or application of uniaxial pressure. The emergence of a pseudogap in the electronic density of states, which supports the idea of the dimensionality-induced BCS-BEC crossover, is also verified.