Larmor frequency dressing by an anharmonic transverse magnetic field

Abstract

We present a theoretical and experimental study of spin precession in the presence of both a static and an orthogonal oscillating magnetic field, which is nonresonant, not harmonically related to the Larmor precession, and of arbitrary strength. Due to the intrinsic nonlinearity of the system, previous models that account only for the simple sinusoidal case cannot be applied. We suggest an alternative approach and develop a model that closely agrees with experimental data produced by an optical-pumping atomic magnetometer. We demonstrate that an appropriately designed nonharmonic field makes it possible to extract a linear response to a weak dc transverse field, despite the scalar nature of the magnetometer, which normally causes a much weaker, second-order response.

Published version has some minor changes; 22 pages and 8 pictures

References in corpus (3)

• The Magnus expansion and some of its applications
• Exploring dynamic localization with a Bose-Einstein condensate
• Localization Effects in ac-driven Tight-Binding Lattices

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• Spin Dressed Relaxation and Frequency Shifts from Field Imperfections
• Atomic orientation by a broadly frequency-modulated radiation: theory and experiment
• Spin dynamic response to a time dependent field
• Harmonic dual dressing of spin one-half systems
• Tri-axial time-dependent magnetic field calibrated in-situ by harmonic analysis of adiabatically evolving atomic spins
• Studying and applying magnetic dressing with a Bell and Bloom magnetometer