Multiphoton transitions in a spin system driven by strong bichromatic field

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776107110039· OSTI ID:21075671

Fedoruk, G G ^[1]; Markevich, S A ^[2]

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1. University of Szczecin, Institute of Physics (Poland)
2. National Academy of Sciences of Belarus, Joint Institute of Solid State and Semiconductor Physics (Belarus)

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 {omega}{sub 1}/{omega}{sub rf}({omega}{sub 1} is the microwave Rabi frequency, {omega}{sub rf} is the RF frequency). Experimental results are consistently interpreted by taking into account the contributions of second and third order in {omega}{sub 1}/{omega}{sub rf} 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.

• OSTI ID: 21075671
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 5 Vol. 105; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
CORRECTIONS
ELECTRON SPIN RESONANCE
HAMILTONIANS
MICROWAVE RADIATION
MULTI-PHOTON PROCESSES
PERTURBATION THEORY
RADIOWAVE RADIATION
SPECTROSCOPY
SPIN