Spin-Controlled Photoluminescence in Hybrid Nanoparticles Purple Membrane System

Roy, Partha; Kantor‐Uriel, Nirit; Mishra, Debabrata; Dutta, Sansa; Friedman, Noga; Sheves, Mordechai; Naaman, Ron

doi:10.1021/acsnano.6b00333

Cited by 22 publications

(27 citation statements)

References 24 publications

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“…Since its discovery, the CISS effect has been studied in thin layers of diverse chiral molecular systems, ranging from Langmuir-Blodgett films of L-or Dstearoyl lysine 12 to self-assembled monolayers (SAMs) of polyalanine 13 , double-strand DNA 14 , bacteriorhodopsin 15,16 and helicene molecules 17 . This phenomenon has been recently proposed: a) for the study of the role of spin in electron transfer through bio-systems 18 , b) to build spintronic logic devices based on organic ferromagnets at room temperature 19 , and c) as a spintronic magnetic memory which, including a ferromagnetic platelet, presents memristor-like behavior 20 .…”

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confidence: 99%

Reinforced Room-Temperature Spin Filtering in Chiral Paramagnetic Metallopeptides

et al. 2020

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Chirality-induced spin selectivity (CISS), the effect of helical molecules acting as room temperature hard magnets that confer spin polarization to electrical current, is an intriguing effect with potential applications in nanospintronics. In this scenario, molecules that are paramagnetic as well as helical would introduce a new degree of freedom in the same nano-scale device that has not been explored so far. Here, in order to investigate this idea, we propose the preparation of self-assembled monolayers (SAMs) based on a helical lanthanide binding tag peptide (LnLBTC) on a ferromagnetic substrate. We confirmed room temperature spin filtering of LnLBTC SAMs by well-established electrochemical approach and by direct local spin transport measurements in solid state devices. The latter were studied by a common liquid-metal drop electron transport system, easily implemented for spin dependent measurements. Electrochemistry shows an averaged spin polarization (SP) of ~5% in presence of a saturation magnetic field (H = 350 mT) while local measurements performed in solid state showed a SP of ~50 20% thanks to the reduction of the contribution of pure electron transport in non-covered areas. Calculations showed that conduction electrons interact strongly with the coordinated lanthanide ion, meaning a fixed chirality-based spin filtering can coexist with a spin filtering that is dependent on the polarization of the magnetic metal ion. This opens the door to all-organic single-molecule memristive devices.

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confidence: 99%

Reinforced Room-Temperature Spin Filtering in Chiral Paramagnetic Metallopeptides

et al. 2020

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“…108,110 Roy et al investigated the photoluminescence dependence on external magnetic fields using hybrid CdSe−bacteriorhodopsin systems embedded within purple membrane and deposited on ferromagnetic surfaces (Figure 7). 135 The authors measured higher photoluminescence intensity from CdSe QDs when ferromagnetic substrate magnetization orientation was aligned antiparallel to the surface normal. However, because charge transfer does not occur between the QDs and the surface, the proposed mechanism that relates photoluminescence and substrate magnetization is more complex than simply considering charge transfer across the molecule/metal interface.…”

Section: Photoluminescence Yield Inversely Reflects Spin Selectivitymentioning

confidence: 99%

Spin Selectivity in Photoinduced Charge-Transfer Mediated by Chiral Molecules

et al. 2019

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Optical control and readout of electron spin and spin currents in thin films and nanostructures have remained attractive yet challenging goals for emerging technologies designed for applications in information processing and storage. Recent advances in room-temperature spin polarization using nanometric chiral molecular assemblies suggest that chemically modified surfaces or interfaces can be used for optical spin conversion by exploiting photoinduced charge separation and injection from well-coupled organic chromophores or quantum dots. Using light to drive photoexcited charge-transfer processes mediated by molecules with central or helical chirality enables indirect measurements of spin polarization attributed to the chiral-induced spin selectivity effect and of the efficiency of spin-dependent electron transfer relative to competitive relaxation pathways. Herein, we highlight recent approaches used to detect and to analyze spin selectivity in photoinduced charge transfer including spin-transfer torque for local magnetization, nanoscale charge separation and polarization, and soft ferromagnetic substrate magnetization- and chirality-dependent photoluminescence. Building on these methods through systematic investigation of molecular and environmental parameters that influence spin filtering should elucidate means to manipulate electron spins and photoexcited states for room-temperature optoelectronic and photospintronic applications.

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“…The efficiency of electron spin filtering through purple membranes films and its mutant could be controlled by illumination with green light, in line with the bR photocycle. 493,494 Whereas significant spin-dependent electron transmission through the native membranes was observed, illumination with green light dramatically reduced the spin filtering of a bR mutant. These studies are consistent with the idea that the accumulation of the M-intermediate state in films upon illumination opens, or facilitates transport along pathways for spin-down electrons, thus resulting in lower electron spin filtering efficiency.…”

Section: Spintronic Propertiesmentioning

confidence: 99%

Protein bioelectronics: a review of what we do and do not know

et al. 2018

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We review the status of protein-based molecular electronics. First, we define and discuss fundamental concepts of electron transfer and transport in and across proteins and proposed mechanisms for these processes. We then describe the immobilization of proteins to solid-state surfaces in both nanoscale and macroscopic approaches, and highlight how different methodologies can alter protein electronic properties. Because immobilizing proteins while retaining biological activity is crucial to the successful development of bioelectronic devices, we discuss this process at length. We briefly discuss computational predictions and their connection to experimental results. We then summarize how the biological activity of immobilized proteins is beneficial for bioelectronic devices, and how conductance measurements can shed light on protein properties. Finally, we consider how the research to date could influence the development of future bioelectronic devices.

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Spin-Controlled Photoluminescence in Hybrid Nanoparticles Purple Membrane System

Cited by 22 publications

References 24 publications

Reinforced Room-Temperature Spin Filtering in Chiral Paramagnetic Metallopeptides

Reinforced Room-Temperature Spin Filtering in Chiral Paramagnetic Metallopeptides

Spin Selectivity in Photoinduced Charge-Transfer Mediated by Chiral Molecules

Protein bioelectronics: a review of what we do and do not know

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