Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins

Lamichhane, Suvechhya; Timalsina, Rupak; Schultz, Cody; Fescenko, Ilja; Ambal, Kapildeb; Liou, Sy-Hwang; Lai, Rebecca Y.; Laraoui, Abdelghani

doi:10.1021/acs.nanolett.3c03843

Nano Lett.

2024

DOI: 10.1021/acs.nanolett.3c03843

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Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins

Suvechhya Lamichhane,

Rupak Timalsina,

Cody Schultz

et al.

Abstract: Nitrogen-vacancy (NV) magnetometry offers an alternative tool to detect paramagnetic centers in cells with a favorable combination of magnetic sensitivity and spatial resolution. Here, we employ NV magnetic relaxometry to detect cytochrome C (Cyt-C) nanoclusters. Cyt-C is a water-soluble protein that plays a vital role in the electron transport chain of mitochondria. Under ambient conditions, the heme group in Cyt-C remains in the Fe 3+ state, which is paramagnetic. We vary the concentration of Cyt-C from 6 t… Show more

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Cited by 4 publications

References 60 publications

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Effect of Substrate on Spin‐Wave Propagation Properties in Ferrimagnetic Thulium Iron Garnet Thin Films

Timalsina,

Giri,

Wang

et al. 2024

Adv Elect Materials

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Rare‐earth iron garnets have distinctive spin‐wave (SW) properties such as low magnetic damping and long SW coherence length making them ideal candidates for magnonics. Among them, thulium iron garnet (TmIG) is a ferrimagnetic insulator with unique magnetic properties including perpendicular magnetic anisotropy (PMA) and topological hall effect at room temperature when grown down to a few nanometers, extending its application to magnon spintronics. Here, the SW propagation properties of TmIG films (thickness of 7–34 nm) grown on GGG and sGGG substrates are studied at room temperature. Magnetic measurements show in‐plane magnetic anisotropy for TmIG films grown on GGG and out‐of‐plane magnetic anisotropy for films grown on sGGG substrates with PMA. SW electrical transmission spectroscopy measurements on TmIG/GGG films unveil magnetostatic surface spin waves (MSSWs) propagating up to 80 µm with a SW group velocity of 2–8 km s−1. Intriguingly, these MSSWs exhibit nonreciprocal propagation, opening new applications in SW functional devices. TmIG films grown on sGGG substrates exhibit forward volume spin waves with a reciprocal propagation behavior up to 32 µm.

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Effect of Substrate on Spin‐Wave Propagation Properties in Ferrimagnetic Thulium Iron Garnet Thin Films

Timalsina,

Giri,

Wang

et al. 2024

Adv Elect Materials

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Plasmonic Nanocavity to Boost Single Photon Emission From Defects in Thin Hexagonal Boron Nitride

Dowran,

Kilic,

Lamichhane

et al. 2024

Laser & Photonics Reviews

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Efficient and compact single photon emission platforms operating at room temperature with ultrafast speed and high brightness will be fundamental components of the emerging quantum communications and computing fields. However, so far, it is very challenging to design practical deterministic single photon emitters based on nanoscale solid‐state materials that meet the fast emission rate and strong brightness demands. Here, a solution is provided to this longstanding problem by using metallic nanocavities integrated with hexagonal boron nitride (hBN) flakes with defects acting as nanoscale single photon emitters (SPEs) at room temperature. The presented hybrid nanophotonic structure creates a rapid speedup and large enhancement in single photon emission at room temperature. Hence, the nonclassical light emission performance is substantially improved compared to plain hBN flakes and hBN on gold‐layered structures without nanocavity. Extensive theoretical calculations are also performed to accurately model the new hybrid nanophotonic system and prove that the incorporation of plasmonic nanocavity is key to efficient SPE performance. The proposed quantum nanocavity single photon source is expected to be an element of paramount importance to the envisioned room‐temperature integrated quantum photonic networks.

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Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

Li,

Yuan,

Bian

et al. 2024

Adv Quantum Tech

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The nitrogen−vacancy (NV) center in diamond gains its versatility when negatively charged (NV−) but is mediocre when neutrally charged. Particularly, the charge states of NV centers are convertible under optical pumping and during the dark intervals, whose dynamics are mixed with the NV−s’ spin polarizations and relaxations, making them difficult to detect. Here, a microwave‐pulses‐assisted charge state dynamics (CSD) measurement method of NV centers in the dark time (DT) is proposed. The microwave pulses are designed to manipulate the populations of the NV−s’ ground state spin triplets (qutrit) to the equilibrium state before the DT. Thus, the longitudinal relaxations of the qutrit are balanced, and pure CSD can be detected. Interestingly, in an annealed bulk diamond, not only the traditional tunneling‐induced fast exponential CSD are observed, but also a slow and long‐term recharging process, which is probably attributed to the exchanging of the electrons between NV centers and the high‐energy‐level charge traps such as vacancy clusters. Furthermore, results demonstrate a 40% increase in NV−s’ contrast by properly extending the recharging DT. These results are significant for the in‐depth study of the NV centers’ CSD and can improve the sensing abilities of the NV− ensemble.

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Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins

Cited by 4 publications

References 60 publications

Effect of Substrate on Spin‐Wave Propagation Properties in Ferrimagnetic Thulium Iron Garnet Thin Films

Effect of Substrate on Spin‐Wave Propagation Properties in Ferrimagnetic Thulium Iron Garnet Thin Films

Plasmonic Nanocavity to Boost Single Photon Emission From Defects in Thin Hexagonal Boron Nitride

Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

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