Type of Publication: | Journal article |
Publication status: | Published |
Author: | Romhányi, Judit; Burkard, Guido; Pályi, András |
Year of publication: | 2015 |
Published in: | Physical Review B ; 92 (2015), 5. - 054422. - ISSN 1098-0121. - eISSN 1550-235X |
DOI (citable link): | https://dx.doi.org/10.1103/PhysRevB.92.054422 |
Summary: |
We theoretically study coherent subharmonic (multiphoton) transitions of a harmonically driven spin. We consider two cases: magnetic resonance (MR) with a misaligned, i.e., nontransversal, driving field, and electrically driven spin resonance (EDSR) of an electron confined in a one-dimensional, parabolic quantum dot, subject to Rashba spin-orbit interaction. In the EDSR case, we focus on the limit where the orbital level spacing of the quantum dot is the greatest energy scale. Then, we apply time-dependent Schrieffer-Wolff perturbation theory to derive a time-dependent effective two-level Hamiltonian, allowing us to describe both MR and EDSR using the Floquet theory of periodically driven two-level systems. In particular, we characterize the fundamental (single-photon) and the half-harmonic (two-photon) spin transitions. We demonstrate the appearance of two-photon Rabi oscillations, and analytically calculate the fundamental and half-harmonic resonance frequencies and the corresponding Rabi frequencies. For EDSR, we find that both the fundamental and the half-harmonic resonance frequencies change upon increasing the strength of the driving electric field, which is an effect analogous to the Bloch-Siegert shift known from MR. Remarkably, the drive-strength-dependent correction to the fundamental EDSR resonance frequency has an anomalous, negative sign, in contrast to the corresponding Bloch-Siegert shift in MR which is always positive. Our analytical results are supported by numerical simulations, as well as by qualitative interpretations for simple limiting cases.
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Subject (DDC): | 530 Physics |
Bibliography of Konstanz: | Yes |
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ROMHÁNYI, Judit, Guido BURKARD, András PÁLYI, 2015. Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance. In: Physical Review B. 92(5), 054422. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.92.054422
@article{Romhanyi2015Subha-32366, title={Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance}, year={2015}, doi={10.1103/PhysRevB.92.054422}, number={5}, volume={92}, issn={1098-0121}, journal={Physical Review B}, author={Romhányi, Judit and Burkard, Guido and Pályi, András}, note={Article Number: 054422} }
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