Band structure motif and bosonic excitations in the fluctuating superconductivity of overdoped cuprates*

Superconducting fluctuation is one of the central discussions in the physics of high-Tc superconductivity, especially when the system is optimally doped. Recent years have seen a renewed interest in this topic regarding overdoped cuprates, where the expectation is to seek a resolution closer to various BCS premises. However, a series of transport and optical experiments reveal substantial departure from the conventional wisdom.

We combine angle-resolved photoemission spectroscopy (ARPES) with inelastic neutron scattering (INS), and aim to provide a holistic view on this issue on overdoped single crystal Bi-2212. In particular, we discuss the role of the van Hove point on the electronic structure and the partial flat band around it [1]. The relation between electronic structure and the underlying magnetic excitation will also be discussed in the context of d-wave pairing and pair-breaking [2].

[1] Science 362, 62 (2018)
[2] Phys. Rev. Lett. 121, 057002 (2018)