Two-Electron-Spin Ratchets as a Platform for Microwave-Free Dynamic Nuclear Polarization of Arbitrary Material Targets

Zangara, Pablo R.; Henshaw, Jacob; Pagliero, Daniela; Ajoy, Ashok; Reimer, Jeffrey A.; Pines, Alexander; Meriles, Carlos A.

doi:10.1021/acs.nanolett.8b05114

Cited by 19 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…( 1) supports the notion of a coherent, electron-mediated nuclear spin transport, a question of interest is whether spin-lattice relaxation (electronic or nuclear) impacts the diffusion process itself (beyond imposing a limit on the polarization buildup). Supporting this notion, recent numerical studies suggest incoherent dynamics can help drive the spin system away from 'blockade' regimes, i.e., spin configurations that prevent the transport of spin polarization 35 . In the present framework, such processes could, e.g., flip P1 centers that have previously been polarized upon crossrelaxation with the NVs.…”

Section: Discussionmentioning

confidence: 98%

Optically pumped spin polarization as a probe of many-body thermalization

et al. 2020

Self Cite

View full text Add to dashboard Cite

Disorder and many body interactions are known to impact transport and thermalization in competing ways, with the dominance of one or the other giving rise to fundamentally different dynamical phases. Here we investigate the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We focus on low-abundance, strongly hyperfine-coupled nuclei, whose role in the polarization transport we expose through the integrated impact of variable radio-frequency excitation on the observable bulk 13C magnetic resonance signal. Unexpectedly, we find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength, which we attribute to effective carbon-carbon interactions mediated by the electronic spin ensemble. In particular, observations across the full range of hyperfine couplings indicate the nuclear spin diffusion constant takes values up to two orders of magnitude greater than that expected from homo-nuclear spin couplings.

show abstract

Section: Discussionmentioning

confidence: 98%

Optically pumped spin polarization as a probe of many-body thermalization

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, interaction between NV centers and 13 C nuclear spins at the GSLAC can potentially be utilized in dynamic nuclear polarization (DNP) [25][26][27] applications. DNP can give rise to a hyperpolarized diamond sample with a potential to transfer spin polarization to adjacent nuclear spins for the improvement of traditional nuclear magnetic resonance methods 16,18,[28][29][30][31][32] . It is therefore of fundamental importance to gain detailed insight into the NV- 13 C spin dynamics at the GSLAC.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence at the ground state level anticrossing of the nitrogen-vacancy center in diamond

Ivády,

Zheng,

Wickenbrock

et al. 2020

Preprint

View full text Add to dashboard Cite

The nitrogen-vacancy center (NV center) in diamond at magnetic fields corresponding to the ground state level anticrossing (GSLAC) region gives rise to rich photoluminescence (PL) signals due to the vanishing energy gap between the electron spin states, which enables to have an effect on the NV center's luminescence for a broad variety of environmental couplings. In this article we report on the GSLAC photoluminescence signature of NV ensembles in different spin environments at various external fields. We investigate the effects of transverse electric and magnetic fields, P1 centers, NV centers, and the 13 C nuclear spins, each of which gives rise to a unique PL signature at the GSLAC. The comprehensive analysis of the couplings and related optical signal at the GSLAC provides a solid ground for advancing various microwave-free applications at the GSLAC, including but not limited to magnetometry, spectroscopy, dynamic nuclear polarization (DNP), and nuclear magnetic resonance (NMR) detection. We demonstrate that not only the most abundant 14 NV center but the 15 NV can also be utilized in such applications and that nuclear spins coupled to P1 centers can be polarized directly by the NV center at the GSLAC, through a giant effective nuclear g-factor arising from the NV center-P1 center-nuclear spin coupling. We report on new alternative for measuring defect concentration in the vicinity of NV centers and on the optical signatures of interacting, mutually aligned NV centers.

show abstract

“…For instance, Ref. [82] theoretically investigated the possibility of exploiting ancillary electron spins to enhance the coupling, which in effect amounts to reducing the NV-target distance. Another intriguing idea is to use the natural bath of 13 C spins present inside the diamond as a polarisation buffer [20].…”

Section: Discussionmentioning

confidence: 99%

Prospects for nuclear spin hyperpolarisation of molecular samples using nitrogen-vacancy centres in diamond

Tetienne,

Hall,

Healey

et al. 2020

Preprint

View full text Add to dashboard Cite

After initial proof-of-principle demonstrations, optically pumped nitrogen-vacancy (NV) centres in diamond have been proposed as a non-invasive platform to achieve hyperpolarisation of nuclear spins in molecular samples over macroscopic volumes and enhance the sensitivity in nuclear magnetic resonance (NMR) experiments. In this work, we model the process of polarisation of external samples by NV centres and theoretically evaluate their performance in a range of scenarios. We find that average nuclear spin polarisations exceeding 10% can in principle be generated over macroscopic sample volumes ( µL) with a careful engineering of the system's geometry to maximise the diamond-sample contact area. The fabrication requirements and other practical challenges are discussed. We then explore the possibility of exploiting local polarisation enhancements in nano/micro-NMR experiments based on NV centres. For micro-NMR, we find that modest signal enhancements over thermal polarisation (by 1-2 orders of magnitude) can in essence be achieved with existing technology, with larger enhancements achievable via micro-structuring of the sample/substrate interface. However, there is generally no benefit for nano-NMR where the detection of statistical polarisation provides the largest signal-to-noise ratio. This work will guide future experimental efforts to integrate NV-based hyperpolarisation to NMR systems.

show abstract

Two-Electron-Spin Ratchets as a Platform for Microwave-Free Dynamic Nuclear Polarization of Arbitrary Material Targets

Cited by 19 publications

References 31 publications

Optically pumped spin polarization as a probe of many-body thermalization

Optically pumped spin polarization as a probe of many-body thermalization

Photoluminescence at the ground state level anticrossing of the nitrogen-vacancy center in diamond

Prospects for nuclear spin hyperpolarisation of molecular samples using nitrogen-vacancy centres in diamond

Contact Info

Product

Resources

About