uk

mfflogo 

Search

News

Itzhak Halevy: Pressure-Induced Crystal-Structure Transition in Fe-Cr Alloys
Begin: 24.04.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

Tomáš Mančal: Modeling of Atomic Force Microscopy Control of Single Molecule Electron Transfer
Begin: 25.04.2019, 13:00
Location: Thursday 25.4.2019 at 13:00, Ke Karlovu 5, Praha 2 in Seminar room F052

Abundance of magneto-elastic functionalities
Location: Prague

Jan Prokleška: Magnetism, magnetic phase transitions and magnetic phase diagrams
Begin: 22.05.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

 
Title: Jerome Hurst: Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect
Number: 22/19
Status: Closing date exceeded
Begin: Thursday, 21.03. 2019, 13:00
Tutor: Tomáš Novotný
Location: Thursday 21.3.2019 at 13:00, Ke Karlovu 5, Praha 2 in Seminar room F052

Thursday 21 March 2019 at 13:00 in Seminar room F052

Dr. Jerome Hurst

Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

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

During the seminar, i will present a recent work where we theoretically investigate the ultrafast 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 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.