Interplay between collective modes in hybrid electron-gas–superconductor structures

Abstract

We study hybridization of collective plasmon and Carlson-Goldman-Artemenko-Volkov modes in a hybrid system, consisting of a two-dimensional layers of electron gas in the normal state and superconductor, coupled by long-range Coulomb forces. The interaction between these collective modes is not possible in a regular single-layer two-dimensional system since they exist in nonoverlapping domains of dimensionless parameter ωτ , where ω is the external electromagnetic field frequency and τ is electron scattering time. Thus, in a single-layer structure, these modes are mutually exclusive. However, the coupling may become possible in a hybrid system consisting of two separated in space materials with different properties, in particular, the electron scattering time. We investigate the electromagnetic power absorption by the hybrid system and reveal the conditions necessary for the hybridization of collective modes. arXiv:2003.08084v2 [cond-mat.supr-con] 30 Apr 2020

Magnetoplasmon resonance technique to monitor two-dimensional Dirac superconductors in fluctuating regime

“…Other examples of hybrid Bose-Fermi systems comprise electron gas -superconductor [25][26][27] , exciton gas -2D electron gas (2DEG) 28 , and exciton-polaritons in a microcavity -2DEG systems 29 . From that perspective, a superconductor in the fluctuating regime can be looked at as a hybrid Bose-Fermi system, where two gases described by different quantum statistics coexist in one (same) 2D layer, forming a Bose-Fermi mixture.…”