Multifrequency Electron Spin‐Relaxation Times

Eaton, Gareth R.

doi:10.1002/9783527633531.ch17

Cited by 10 publications

(12 citation statements)

References 175 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spin-relaxation-time, T1, represents spin-flips (vertical displacement), while the phase-memory-time, T2, describes the evolution of the quantum phase information (azimuthal movement). We measure T1 via the picket-fence technique 23 and…”

Section: And Si)mentioning

confidence: 99%

“…The modulation of the Hahnecho amplitude (Fig.3b) at ω/2π=3.6 MHz, a frequency typical of 13 C spin-nuclei interactions, suggests that hyperfine decoherence channels are important. Electron-electron-double-resonance-detected-nuclearmagnetic-resonance, EDNMR, allows de-convoluting the different nuclear contributions 17,23 (Fig.4a). 14 N coupling is dominant, confirming the analysis of CW spectra, but 13 C, 1 H single-quantum-transitions, 14 N,…”

Section: And Si)mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic edge states and coherent manipulation of graphene nanoribbons

Slota

Keerthi

Myers

et al. 2018

Nature

268

220

View full text Add to dashboard Cite

Graphene, a single-layer network of carbon atoms, has outstanding electrical and mechanical properties . Graphene ribbons with nanometre-scale widths (nanoribbons) should exhibit half-metallicity and quantum confinement. Magnetic edges in graphene nanoribbons have been studied extensively from a theoretical standpoint because their coherent manipulation would be a milestone for spintronic and quantum computing devices . However, experimental investigations have been hampered because nanoribbon edges cannot be produced with atomic precision and the graphene terminations that have been proposed are chemically unstable . Here we address both of these problems, by using molecular graphene nanoribbons functionalized with stable spin-bearing radical groups. We observe the predicted delocalized magnetic edge states and test theoretical models of the spin dynamics and spin-environment interactions. Comparison with a non-graphitized reference material enables us to clearly identify the characteristic behaviour of the radical-functionalized graphene nanoribbons. We quantify the parameters of spin-orbit coupling, define the interaction patterns and determine the spin decoherence channels. Even without any optimization, the spin coherence time is in the range of microseconds at room temperature, and we perform quantum inversion operations between edge and radical spins. Our approach provides a way of testing the theory of magnetism in graphene nanoribbons experimentally. The coherence times that we observe open up encouraging prospects for the use of magnetic nanoribbons in quantum spintronic devices.

show abstract

Section: And Si)mentioning

confidence: 99%

Section: And Si)mentioning

confidence: 99%

Magnetic edge states and coherent manipulation of graphene nanoribbons

Slota

Keerthi

Myers

et al. 2018

Nature

268

220

View full text Add to dashboard Cite

show abstract

“…This indicates that the variation in spin relaxation obtained for these systems are definitely originated from their ordered/disordered morphology balance in parallel with the interaction of charge carriers with different spin packets and their microenvironment. Besides this, an exchange interaction between these spin ensembles is modulated by spin–orbit coupling that depends on a sufficient density of vibrational and rotational states . This accelerates electron relaxation of all spins stabilized or/and initiated in the system.…”

Section: Resultsmentioning

confidence: 99%

Light-Induced Electron Paramagnetic Resonance Spectroscopy of Spin-Assisted Charge Transfer in Narrow-Bandgap Copolymer:Methanofullerene Composites

et al. 2019

View full text Add to dashboard Cite

Magnetic resonance, relaxation, and dynamic parameters of polarons and methanofullerene radical anions photoinduced in photovoltaic composites formed by narrow-bandgap poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(bithiophene)] (F8T2), poly[2,7-(9,9-dioctylfluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO–DBT), and poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) copolymers as electron donors with [6,6]-phenyl-C61-butanoic acid methyl ester (PC61BM) as electron acceptor were comparatively studied by the direct light-induced electron paramagnetic resonance (LEPR) spectroscopy in combination with spectral simulations in a wide temperature range. A number of mobile polarons are captured by deep spin traps formed in bulk heterojunctions due to their disorder. It was shown that the concentration, transport, and recombination of photoinitiated charge carriers depend on the structure of the copolymer matrix and the interaction between the other spin packets, as well as on the number, spatial distribution, and energy depth of the spin traps. The recombination of polarons and methanofullerene radical anions can be described in the framework of a second-order bimolecular process in the F8T2:PC61BM and PFO–DBT:PC61BM composites and a first-order monomolecular process in the PCDTBT:PC61BM bulk heterojunctions. The dependence of the ambipolarity of the copolymer matrix on the anisotropy of spin dynamics is shown.

show abstract

“…At our working temperatures (2 K) γ hom is dominated by T 2 32 . As for conventional ESR spectroscopy, T 2 is bound by the phase memory time, T m ≤ T 2 53 , which is the one effectively measured by ESR. In turns, this gives an upper limit γ hom ≤ 1/T m ≈ 1/(1 μs) = 1 MHz (taking the values in ref.…”

Section: Continuous Wave Transmission Spectroscopymentioning

confidence: 99%

Storage and retrieval of microwave pulses with molecular spin ensembles

Bonizzoni

Ghirri

Santanni³

et al. 2020

npj Quantum Inf

View full text Add to dashboard Cite

Hybrid architectures combining complementary quantum systems will be largely used in quantum technologies and the integration of different components is one of the key issues. Thanks to their long coherence times and the easy manipulation with microwave pulses, electron spins hold a potential for the realization of quantum memories. Here, we test diluted oxovanadium tetraphenyl porphyrin (VO(TPP)) as a prototypical molecular spin system for the Storage/Retrieval of microwave pulses when embedded into planar superconducting microwave resonators. We first investigate the efficiency of several pulse sequences in addressing the spins. The Carr-Purcell and the Uhrig Dynamical Decoupling enhance the memory time up to three times with three π pulses. We then successfully store and retrieve trains of up to 5 small pulses by using a single recovery pulse. These results demonstrate the memory capabilities of molecular spin ensembles when embedded into quantum circuits.

show abstract

Multifrequency Electron Spin‐Relaxation Times

Cited by 10 publications

References 175 publications

Magnetic edge states and coherent manipulation of graphene nanoribbons

Magnetic edge states and coherent manipulation of graphene nanoribbons

Light-Induced Electron Paramagnetic Resonance Spectroscopy of Spin-Assisted Charge Transfer in Narrow-Bandgap Copolymer:Methanofullerene Composites

Storage and retrieval of microwave pulses with molecular spin ensembles

Contact Info

Product

Resources

About