Theory of the inverse Faraday effect in dissipative Rashba electron systems: Floquet engineering perspective

Abstract

We theoretically study the inverse Faraday effect (IFE), i.e., photo-induced magnetization, in two-dimensional Rashba spin-orbit coupled electron systems irradiated by a circularly polarized light. The quantum master (Gorini-Kossakowski-Sudarshan-Lindblad) equation enables us to accurately compute the laser driven dynamics, taking inevitable dissipation effects into account. To find the universal features of laser-driven magnetization and its dynamics, we comprehensively investigate (i) the nonequilibrium steady state (NESS) driven by a continuous wave and (ii) ultrafast spin dynamics driven by short laser pulses. In the NESS (i), the laser-induced magnetization and its dependence of several parameters (laser frequency, laser field strength, temperature, dissipation strength, etc.) are shown to be in good agreement with the predictions from Floquet theory for dissipative systems in the high-frequency regime. In the case (ii), we focus on ferromagnetic metal states by introducing an effective magnetic field to the Rashba model as the mean field of electron-electron interaction. We find that a precession of the magnetic moment occurs due to the pulse-driven instantaneous magnetic field and the initial phase of the precession is controlled by changing the sign of light polarization. This is well consistent with the spin dynamics observed in experiments of laser-pulse-driven IFE. We discuss how the pulse-driven dynamics are captured by the Floquet theory. Our results %pave the way for computing provides a microscopic method to compute ultrafast dynamics in many electron systems irradiated by intense light.

arXiv comment21 pages (two column), 12 figures

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