2015/08/05 by Chen Sun, N A Sinitsyn, N. A. Sinitsyn
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Beam (structure) #Beam energy #Cathode ray #Electron #Excitation #Magnetic field #Quantum and electron transport phenomena #Quantum optics and atomic interactions #Resonance (particle physics) #Spin (aerodynamics) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1088/1751-8113/48/50/505202
published as J. Phys. A: Math. Theor., 48, 505202 (2015) · 12 pages, 6 figures
arxiv created 2015/08/05 · openalex publication_date 2015/11/20 · openalex created_date 2016/06/24 · arxiv updated 2017/02/27 · openalex updated_date 2026/08/06
We consider a localized electronic spin controlled by a circularly polarized optical beam and an external magnetic field. When the frequency of the beam is tuned near an optical resonance with a continuum of higher energy states, effective magnetic fields are induced on the two-level system via the inverse Faraday effect. We explore the process in which the frequency of the beam is made linearly time-dependent so that it sweeps through the optical resonance, starting and ending at the values far away from it. In addition to changes of spin states, Kramers-Kronig relations guarantee that a localized electron can also escape into a continuum of states. We argue that probabilities of transitions between different possible electronic states after such a sweep of the optical frequency can be found exactly, regardless the shape of the resonance. We also discuss extension of our results to multistate systems.