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Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance

Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance

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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

@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} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/32366"> <dc:creator>Burkard, Guido</dc:creator> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/32366"/> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-12-08T09:54:28Z</dcterms:available> <dc:language>eng</dc:language> <dc:creator>Pályi, András</dc:creator> <dcterms:abstract xml:lang="eng">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.</dcterms:abstract> <dcterms:issued>2015</dcterms:issued> <dc:contributor>Romhányi, Judit</dc:contributor> <dc:creator>Romhányi, Judit</dc:creator> <dc:contributor>Pályi, András</dc:contributor> <dcterms:title>Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance</dcterms:title> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2015-12-08T09:54:28Z</dc:date> <dc:contributor>Burkard, Guido</dc:contributor> </rdf:Description> </rdf:RDF>

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