Abstract
We demonstrate phase-coherent Stark effects from a radiofrequency E field at twice the NMR frequency (2 ω 0) of 69Ga in GaAs. The 2 ω 0 phase ( ϕ E ) selects component responses from the nuclear quadrupole Hamiltonian ( H Q ) . This is possible by synchronizing few-μs 2ω 0 pulses with an NMR line-narrowing sequence, which averages the Stark interaction to dominate spectra on a background with 10 3× enhanced resolution. Spectra vs ϕ E reveal relative sizes of tensorial factors in H Q . Comparative modeling and numerical simulations evaluate spectral features unexplained by average Hamiltonian theory, and suggest improvements for quantitative calibration of individual response components. Application of this approach to bulk samples is of value to define Stark responses that may later be used to interrogate the internal electrostatics of structured samples.
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