Direct measurement of diffusion in liquid phase by electron spin resonance

Blank, Aharon; Talmon, Y.; Shklyar, Michael; Shtirberg, Lazar; Harneit, Wolfgang

doi:10.1016/j.cplett.2008.09.052

Cited by 17 publications

(22 citation statements)

References 33 publications

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“…A second type of sample was made of thin, 150-μm fused quartz slide, which was placed in a solution of N@C 60 (Ref. 7) and C 60 mixture in CS 2 with a N@C 60 :C 60 ratio of ∼2×10 −4 . The solution was left overnight in a fume hood, resulting in the evaporation of the CS 2 and crystallization of the solid N@C 60 :C 60 on the slide's surface, creating a thin layer of solids on one side of the glass (∼10-20 μm thick, based on optical microscopy).…”

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confidence: 99%

Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection

Twig

Dikarov

Hutchison

et al. 2011

Review of Scientific Instruments

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Commercial electron spin resonance spectroscopy and imaging systems make use of the so-called "induction" or "Faraday" detection, which is based on a radio frequency coil or a microwave resonator. The sensitivity of induction detection does not exceed ~3 × 10(8) spins/√Hz. Here we show that through the use of a new type of surface loop-gap microresonators (inner size of 20 μm), operating at cryogenic temperatures at a field of 0.5 T, one can improve upon this sensitivity barrier by more than 2 orders of magnitude and reach spin sensitivities of ~1.5 × 10(6) spins/√Hz or ~2.5 × 10(4) spins for 1 h.

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confidence: 99%

Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection

Twig

Dikarov

Hutchison

et al. 2011

Review of Scientific Instruments

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“…2a) was measured in the past in the unique case of conduction electrons in solids, thanks to their relatively large diffusion coefficient of D s > 10 -6 m 2 /s [30]. More recently, a much more advanced setup using a unique set including a miniature resonator and gradient coils, driven by powerful and fast gradient drivers, was employed to measure physical electron spin diffusion in liquids, with D s as low as 10 -10 m 2 /s [31][32][33]. Other works, from the field of spintronics, refer to "spin diffusion length (or time)" (Fig.…”

Section: Measurements Of Spin Diffusionmentioning

confidence: 99%

Direct Measurement of the Flip-Flop Rate of Electron Spins in the Solid State

et al. 2016

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Electron spins in solids have a central role in many current and future spinbased devices, ranging from sensitive sensors to quantum computers (QC). Many of these apparatuses rely on the formation of well-defined spin structures (e.g., a 2D array) with controlled and well-characterized spin-spin interactions. While being essential for device operation, these interactions can also result in undesirable effects, such as decoherence. Arguably, the most important pure quantum interaction that causes decoherence is known as the "flip-flop" process, where two interacting spins interchange their quantum state. Currently, for electron spins, the rate of this process can only be estimated theoretically, or measured indirectly, under limiting assumptions and approximations, via spin relaxation data. This work experimentally demonstrates for the first time how the flip-flop rate can be directly and accurately measured by examining spin diffusion processes in the solid state for physically fixed spins. Under such terms, diffusion can occur only through this flip-flop-mediated quantum state exchange and not via actual spatial motion. Our approach was implemented on two types of samples, phosphorus-doped 28 Si and nitrogen vacancies (NV) in diamond, both of which are significantly relevant to quantum sensors and information processing. However, while the results for the former sample are conclusive and reveal a flip-flop rate of ~12.3 Hz, for the latter sample only an upper limit of ~0.2 Hz for this rate could be estimated.

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“…Then we demonstrate a noise-free control of coherence by applying pulsedgradient of magnetic field. In this case we applied technique of the pulsed-gradient spin-echo (PGSE) [32] modified for SFC-protocol of quantum memory. Finally we summarize the obtained results and discuss possible next steps towards its further improvement.…”

Section: Introductionmentioning

confidence: 99%

Spin frequency comb echo memory controlled by a pulsed-gradient of magnetic field

et al. 2015

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The controllable storage and on demand retrieval of the microwave pulses by using the photon echo quantum memory approach based on a spin frequency comb of inhomogeneous broadening (SFC-protocol) have been demonstrated. We have used an electron-nuclear spin ensemble of tetracyanoethylene anion radicals in toluene which has a natural periodic structure of narrow electron-spin resonance (ESR) hyperfine lines. On-demand retrieval of the stored field has been realized by using two pulses of the magnetic field gradient of an opposite polarity which hold the electron spins in a dephased excited state during the storage time. The obtained experimental results demonstrate promising properties for coherent controlling the electron-nuclear spin ensemble of radicals in liquid that could be useful for implementation of room-temperature broadband quantum memory.

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Direct measurement of diffusion in liquid phase by electron spin resonance

Cited by 17 publications

References 33 publications

Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection

Note: High sensitivity pulsed electron spin resonance spectroscopy with induction detection

Direct Measurement of the Flip-Flop Rate of Electron Spins in the Solid State

Spin frequency comb echo memory controlled by a pulsed-gradient of magnetic field

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