Journal of Experimental and Theoretical Physics

, Volume 105, Issue 5, pp 893–899

Multiphoton transitions in a spin system driven by strong bichromatic field

Atoms, Molecules, Optics

DOI: 10.1134/S1063776107110039

Cite this article as:
Saiko, A.P., Fedoruk, G.G. & Markevich, S.A. J. Exp. Theor. Phys. (2007) 105: 893. doi:10.1134/S1063776107110039

Abstract

EPR transient nutation spectroscopy is used to measure the effective field (Rabi frequency) for multiphoton transitions in a two-level spin system bichromatically driven by a transverse microwave (MW) field and a longitudinal radio-frequency (RF) field. The behavior of the effective field amplitude is examined in the case of a relatively strong MW field, when the derivation of the effective Hamiltonian cannot be reduced to first-order perturbation theory in ω1rf1 is the microwave Rabi frequency, ωrf is the RF frequency). Experimental results are consistently interpreted by taking into account the contributions of second and third order in ω1rf evaluated by Krylov-Bogolyubov-Mitropolsky averaging. In the case of inhomogeneously broadened EPR line, the third-order correction modifies the nutation frequency, while the second-order correction gives rise to a change in the nutation amplitude due to a Bloch-Siegert shift.

PACS numbers

42.50.Gy33.35.+r32.80.Wr

Copyright information

© Pleiades Publishing, Inc. 2007

Authors and Affiliations

  • A. P. Saiko
    • 1
  • G. G. Fedoruk
    • 2
    • 3
  • S. A. Markevich
    • 1
  1. 1.Joint Institute of Solid State and Semiconductor PhysicsNational Academy of Sciences of BelarusMinskBelarus
  2. 2.Institute of PhysicsUniversity of SzczecinSzczecinPoland
  3. 3.Sevchenko Institute for Applied Physical ProblemsMinskBelarus