Inverse Faraday Effect for Superconducting Condensates

Abstract

The Cooper pairs in superconducting condensates are shown to acquire a temperature-dependent dc magnetic moment under the effect of the circularly polarized electromagnetic radiation. The mechanisms of this inverse Faraday effect are investigated within the simplest version of the phenomenological dynamic theory for superfluids, namely, the time-dependent Ginzburg-Landau (GL) model. The light-induced magnetic moment is shown to be strongly affected by the nondissipative oscillatory contribution to the superconducting order parameter dynamics, which appears due to the nonzero imaginary part of the GL relaxation time. The relevance of the latter quantity to the Hall effect in the superconducting state allows us to establish the connection between the direct and inverse Faraday phenomena.

Dynamic Spin-Triplet Order Induced by Alternating Electric Fields in Superconductor-Ferromagnet-Superconductor Josephson Junctions

“…The triplet nature of the proposed light-induced dynamical correlations provides an additional advantage opening a perspective of photon-magnon coupling mediated by the triplet correlations. The proposed effect extends the possibilities of generating and controlling nonequilibrium states of matter which have attracted significant attention recently, such as Floquet topological insulators [18], oddfrequency superconductivity [19], time crystals [20][21][22], driven Dirac materials [23][24][25], light-induced and lightmanipulated superconductivity [26][27][28][29][30][31][32], vortex states [33,34], cavity-enhanced ferroelectric phase transition [35] and dynamical hidden orders [36][37][38][39].…”

Toward the Light‐Operated Superconducting Devices: Circularly Polarized Radiation Manipulates the Current‐Carrying States in Superconducting Rings

“…For small rings with R√ 𝜖 0 ≪ 1 (𝜌 ≫ 1) the magnetic moment linearly grows with the increase of 𝜔 L : M(𝜔 L ) ≈ −M 0 𝜔 L ( R√ 𝜖 0 ) (compare with ref. [12]) but scales as 𝜔 −3 L for large frequencies…”

“…However, this phenomenon is a general feature of light-matter interaction and is thus allowed in all media, regardless of their crystallographic and magnetic structures including nonmagnetic metallic systems [11] and superconductors. [12] Light excitation of currents and magnetic moments in normalstate conductor nanorings has been theoretically addressed in refs. [13][14][15][16][17].…”

“…Recently, Mironov et al [12] have shown qualitatively that IFE in superconductors can arise from the light-induced gap modulation effect due to the concentration dependence of the superconducting gap function. Using the TDGL model, [21][22][23][24] they have shown that the light-induced magnetic moment is strongly affected by the nondissipative oscillatory contribution to the superconducting order parameter dynamics, which arises from the nonzero imaginary part of the Ginzburg-Landau relaxation time.…”

Inverse Faraday effect in Mott insulators

“…Earlier theoretical work by Battiato et al [13] provided a detailed quantum mechanical analysis of metallic IFE, relying on the electronic orbital degrees of freedom. Recently, IFE has been predicted in spin-orbit coupled Rashba metals [14], semimetals [15][16][17] and also for superconductors [18,19]. While the realization of IFE using ultrafast control of spin dynamics in rare-earth orthoferrites [ReFeO 3 , Re = Dy, Ho, Er; (antiferromagnetic insulator)] has been reported in previous works [6,[20][21][22][23][24][25], a detailed microscopic analysis of the latter in the Mott insulating regime is still lacking.…”