Interplay between density and superconducting quantum critical fluctuations

Abstract

We consider the case of a density-driven metal-superconductor transition in the proximity of an electronic phase separation. In particular we investigate the interplay between superconducting fluctuations and density fluctuations, which become quantum critical when the electronic phase separation vanishes at zero temperature into a quantum critical point. In this situation the critical dynamical density fluctuations strongly affect the dynamics of the Cooper pair fluctuations, which acquire a more singular character with a z=3 dynamical critical index. This gives rise to a scenario that possibly rules the disappearance of superconductivity when the electron density is reduced by elecrostatic gating at the LaAlO3/SrTiO3 interface.

5 pages, 4 figures

References in corpus (7)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Metal-insulator transition in two-dimensional electron systems
• Theory of quantum metal to superconductor transitions in highly conducting systems
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Photoresponse dynamics in amorphous-LaAlO${}_3$/SrTiO${}_3$ interfaces
• Pseudo-gap in tunneling spectra as a signature of inhomogeneous superconductivity in oxide interfaces
• Possible mechanisms of electronic phase separation in oxide interfaces

Cited by in corpus (3)

• Phase separation from electron confinement at oxide interfaces
• Negative electronic compressibility and nanoscale inhomogeneity in ionic-liquid gated two-dimensional superconductors
• Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives