Density Waves Cause Sub-Gap Structures but no Pseudogap in Superconducting Cuprates

Abstract

In scanning tunneling microscopy (STM) conductance curves, the superconducting gap of cuprates is sometimes accompanied by small sub-gap structures at very low energy. This was documented early on near vortex cores and later at zero magnetic field. Using mean-field toy models of coexisting d-wave superconductivity ($d$SC), \emph{d}-form factor density wave ($d$FF-DW), and extended s-wave pair density wave ($s^{\prime }$PDW), we find agreement with this phenomenon, with $s^{\prime }$PDW playing a critical role. We explore the high variability of the gap structure with changes in band structure and density wave (DW) wave vector, thus explaining why sub-gap structures may not be a universal feature in cuprates. In the absence of nesting, non-superconducting results never show signs of pseudogap, even for large density waves magnitudes, therefore reinforcing the idea of a distinct origin for the pseudogap, beyond mean-field theory. Therefore, we also briefly consider the effect of DWs on a pre-existing pseudogap.

13 pages, 8 figures

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Cited by in corpus (13)

• Visualizing the Energy-gap Modulations of the Cuprate Pair Density Wave State
• Coexistence of Superconductivity and Antiferromagnetism in the Hubbard model for cuprates
• Atomic-scale Electronic Structure of the Cuprate Pair Density Wave State Coexisting with Superconductivity
• Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
• Emergent Charge Order from Correlated Electron-Phonon Physics in Cuprates
• Intrinsic Cluster-Shaped Density Waves in Cellular Dynamical Mean-Field Theory
• Charge- and pair-density-wave orders in the one-band Hubbard model with dynamical mean field theory
• Structure of the Charge-Density Wave in Cuprate Superconductors: Lessons from NMR
• Possible Nodeless Superconducting Gaps in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and YBa${}_2$Cu${}_3$O${}_{7-x}$ Revealed by Cross-Sectional Scanning Tunneling Spectroscopy
• The Future of the Correlated Electron Problem
• Raman Response of the Charge Density Wave in Cuprate Superconductors
• Atomic-Scale Visualization of the Cuprate Pair Density Wave State
• Intrinsic Hallmarks of Phonon-Induced Charge Order in Cuprates