Relativistic interaction Hamiltonian coupling the angular momentum of light and the electron spin
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, no 10, 100402Article in journal (Refereed) Published
On the basis of the Dirac equation, a relativistic interaction Hamiltonian is derived which linearly couples the angular momentum density j of the electromagnetic (EM) field and the electron's spin sigma. The expectation value of this novel Hamiltonian is demonstrated to be precisely the recently proposed energy coupling the EM angular momentum density and magnetic moments [A. Raeliarijaona et al., Phys. Rev. Lett. 110, 137205 (2013)]. This previously overlooked Hamiltonian is also found to naturally result in the exact analytical form of the interaction energy inherent to the inverse Faraday effect, therefore demonstrating its relevance and easy use for the derivation of other complex magneto-optical and magnetoelectric effects originating from electron spin-light angular momentum couplings.
Place, publisher, year, edition, pages
2015. Vol. 92, no 10, 100402
IdentifiersURN: urn:nbn:se:uu:diva-264044DOI: 10.1103/PhysRevB.92.100402ISI: 000361037200001OAI: oai:DiVA.org:uu-264044DiVA: diva2:859212
FunderEU, FP7, Seventh Framework Programme, 281043