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arXiv · 1810.02097

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

Jerome Hurst·Peter Oppeneer·Paul-Antoine Hervieux·Giovanni Manfredi
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Abstract

We theoretically investigate the creation of a magnetic moment in gold nanoparticles by circularly polarized laser light. To this end, we describe the collective electron dynamics in gold nanoparticles using a semiclassical approach based on a quantum hydrodynamic model that incorporates the prin- cipal quantum many-body and nonlocal effects, such as the electron spill-out, the Hartree potential, and the exchange and correlation effects. We use a variational approach to investigate the breathing and the dipole dynamics induced by an external electric field. We show that gold nanoparticles can build up a static magnetic moment through the interaction with a circularly polarized laser field. We analyze that the responsible physical mechanism is a plasmonic, orbital inverse Faraday effect, which can be understood from the time-averaged electron current that contains currents rotating on the nanoparticles surface. The computed laser-induced magnetic moments are sizeable, of about 0.35 muB/atom for a laser intensity of 450 GW/cm2 at plasmon resonance.

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Jerome Hurst, Peter Oppeneer, Paul-Antoine Hervieux, Giovanni Manfredi. 2018-10-04. Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect. https://doi.org/10.1103/physrevb.98.134439

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