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Hurst, Jerome
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Hurst, J., Oppeneer, P. M., Manfredi, G. & Hervieux, P.-A. (2018). Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect. Physical Review B, 98(13), Article ID 134439.
Open this publication in new window or tab >>Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 13, article id 134439Article in journal (Refereed) Published
Abstract [en]

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 principal 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 light at the localized surface plasmon (LSP) resonance. 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 nanoparticle's surface. The computed laser-induced magnetic moments are sizable, of about 0.35 p. B /atom for a laser intensity of 45 x 10(10) W/cm(2) at LSP resonance.

Place, publisher, year, edition, pages
National Category
Condensed Matter Physics
urn:nbn:se:uu:diva-369905 (URN)10.1103/PhysRevB.98.134439 (DOI)000448046900002 ()
Knut and Alice Wallenberg Foundation, 2015.0060Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)EU, Horizon 2020, 737709
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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