arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2107.09050cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
收藏

电荷密度波Kagome金属的多穹顶超导性

Multidome superconductivity in charge density wave kagome metals

Yu-Ping Lin, Rahul M. Nandkishore

摘要:

受最近对可果美金属$A\text{V}_3\text{Sb}_5$与$A=\text{K}$、$\text{Rb}$和$\text{Cs}$的实验的启发,这些实验显示了在$\sim100$ K处的电荷密度波(CDW)和在$\sim1$ K处的超导性,我们探索了超导性的开始,从它从母CDW下降的角度来看。我们认为,将超导性视为重建(由CDW)费米表面的弱耦合不稳定性,自然解释了实验观察到的“多圆顶”非单调依赖于压力,与超导临界温度中的“峰值”与重建费米表面的范霍夫奇异性相关。这种“亲子关系”也自然地解释了超导性和CDW之间能量尺度的巨大分离。我们讨论了不同的可能的配对机制,并推测CDW或重建Pomeranchuk波动可能介导的配对相互作用。

英文摘要:

Motivated by recent experiments on the kagome metals $A\text{V}_3\text{Sb}_5$ with $A=\text{K}$, $\text{Rb}$, and $\text{Cs}$, which show a charge density wave (CDW) at $\sim100$ K and the superconductivity at $\sim1$ K, we explore the onset of the superconductivity, taking the perspective that it descends from a parent CDW. We argue that viewing the superconductivity as a weak-coupling instability of a reconstructed (by the CDW) Fermi surface naturally explains the experimentally observed 'multidome' nonmonotonic dependence on pressure, with the 'peaks' in the superconducting critical temperature being associated with the Van Hove singularities of the reconstructed Fermi surface. This 'parent-child relationship' also naturally explains the large separation of energy scales between the superconductivity and the CDW. We discuss different possible pairing mechanisms and speculate that the CDW or reconstructed Pomeranchuk fluctuations may mediate the pairing interaction.

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。

↑