Supercurrent-induced resonant optical response

Article

关键词: GAP;    CONDUCTIVITY;    RELAXATION;   

DOI  :  10.1103/PhysRevB.106.214526

来源: SCIE

【 摘 要 】

The optical conductivity encodes the current response to a time dependent electric field. We develop a theory of the optical conductivity sigma(w) in the presence of a dc supercurrent. Current induced optical response is prohibited when current is conserved, an illustrative example of which is Galilean invariant systems. However, we show that lattice effects give rise to a pronounced current dependent peak in sigma(w) at the gap edge w = 2A, which diverges in the clean limit. We demonstrate this in a model of a multiband superconductor. Our theory predicts the current induced peak in sigma(w) to scale quadratically with the super-current density, as was recently reported for a new mechanism for direct activation of the Higgs mode with light.

【 授权许可】

Free