来自不相干玻色子的奇异金属
Strange metal from incoherent bosons
摘要：
著名的费米液体理论在奇异金属相中的崩溃是关联量子物质的核心谜团。最近的实验报告短命载体的动机，随着普遍存在的观察调制激发的铜酸盐的相图，我们提出了一个模型，这个阶段。我们引入玻色子出现在一对密度波的残余物作为额外的电流载体在奇怪的金属相。这些玻色子激发是有限动量库珀对，因此携带两倍的电子电荷，其净自旋可以是零或一，由两个自旋- $1/2$电子产生。我们表明，这样的模型可以捕捉到著名的电阻率与温度的线性关系，并体现了德鲁德形式的交流电导率与普朗克耗散率。此外，这种玻色子是不相干的，因此对霍尔电导率没有贡献。从自旋三重态对称的电子对中出现的玻色子也再现了最近观察到的线性场内磁阻[P. Giraldo-Gallo et al.，Science 361，479（2018）; J. Ayres等人，arXiv：2012.01208（2020）]。
英文摘要：
The breakdown of the celebrated Fermi liquid theory in the strange metal phase is the central enigma of correlated quantum matter. Motivated by recent experiments reporting short-lived carriers, along with the ubiquitous observations of modulated excitations in the phase diagram of cuprates, we propose a model for this phase. We introduce bosons emerging from the remnants of a pair density wave as additional current carriers in the strange metal phase. These bosonic excitations are finite momentum Cooper pairs and thus carry twice the electronic charge, and its net spin can either be zero or one arising from the two spin-$1/2$ electrons. We show that such a model can capture the famous linear relationship of resistivity with temperature and manifests the Drude form of ac-conductivity with a Planckian dissipation rate. Furthermore, such bosons are incoherent and hence do not contribute to the Hall conductivity. The bosons emerging from the electron pairs of spin-triplet symmetry also reproduce the recently observed linear in-field magnetoresistance [P. Giraldo-Gallo et al., Science 361, 479 (2018); J. Ayres et al., arXiv: 2012.01208 (2020)].
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