标题： RKKY相互作用与平行双量子点基态的性质 显示英文标题

标题： The RKKY Interaction and the Nature of the Ground State of Double Dots in Parallel

摘要： 我们通过结合自旋玻色子平均场理论和Bethe假设论证，得出紧密排列的双量子点在并联耦合到单个有效通道时，其基态是费米液体。 我们通过研究量子点的电导率、杂质熵和自旋关联来实现这一点。 特别是在我们发现零温度下的电导率由Friedel求和规则表征，这是费米液体物理的特征，并且在零温度极限下杂质熵消失，表明基态是一个单重态。 这个结论与多项数值重整化群研究相矛盾。 我们提出了一个可能的差异原因。 显示英文摘要

摘要： We argue through a combination of slave boson mean field theory and the Bethe ansatz that the ground state of closely spaced double quantum dots in parallel coupled to a single effective channel are Fermi liquids. We do so by studying the dots' conductance, impurity entropy, and spin correlation. In particularly we find that the zero temperature conductance is characterized by the Friedel sum rule, a hallmark of Fermi liquid physics, and that the impurity entropy vanishes in the limit of zero temperature, indicating the ground state is a singlet. This conclusion is in opposition to a number of numerical renormalization group studies. We suggest a possible reason for the discrepancy.