Spin-Exciton Delocalization Enhancement in Multilayer Chiral Linker/Quantum Dot Structures

Fridman, Hanna T.; Dehnel, Johanna; Yochelis, Shira; Lifshitz, Efrat; Paltiel, Yossi

doi:10.1021/acs.jpclett.9b01433

Cited by 9 publications

(17 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar effect were observed for FeS 2 QDs capped by L/D-cysteine which can assemble within chiral hydrogels Reprinted with permission from a study by Fridman et al [133]. Copyright 2019 American Chemical Society.…”

Section: /-supporting

confidence: 61%

See 1 more Smart Citation

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

et al. 2020

View full text Add to dashboard Cite

Chirality is one of the most fascinating occurrences in the natural world and plays a crucial role in chemistry, biochemistry, pharmacology, and medicine. Chirality has also been envisaged to play an important role in nanotechnology and particularly in nanophotonics, therefore, chiral and chiroptical active nanoparticles (NPs) have attracted a lot of interest over recent years. Optical activity can be induced in NPs in several different ways, including via the direct interaction of achiral NPs with a chiral molecule. This results in circular dichroism (CD) in the region of the intrinsic absorption of the NPs. This interaction in turn affects the optical properties of the chiral molecule. Recently, studies of induced chirality in quantum dots (QDs) has deserved special attention and this phenomenon has been explored in detail in a number of important papers. In this article, we review these important recent advances in the preparation and formation of chiral molecule–QD systems and analyze the mechanisms of induced chirality, the factors influencing CD spectra shape and the intensity of the CD, as well as the effect of QDs on chiral molecules. We also consider potential applications of these types of chiroptical QDs including sensing, bioimaging, enantioselective synthesis, circularly polarized light emitters, and spintronic devices. Finally, we highlight the problems and possibilities that can arise in research areas concerning the interaction of QDs with chiral molecules and that a mutual influence approach must be taken into account particularly in areas, such as photonics, cell imaging, pharmacology, nanomedicine and nanotoxicology.

show abstract

Section: /-supporting

confidence: 61%

“…The CISS effect also allows for controlling the electron transfer between QDs in a multilayer structure ( Figure 14C) [133]. In CdSe QD layers connected by chiral linkers, PL decay time under excitation by right circular polarized light is 3.5 times longer than under excitation by left circular polarized light.…”

Section: Spintronicsmentioning

confidence: 99%

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

et al. 2020

View full text Add to dashboard Cite

show abstract

“…We have chosen as a reference molecular system a polyglycine α-helix with its D-(D-Gly) and L-(L-Gly) enantiomers and a length of 15 Å. This oligomer length is roughly of the same order of magnitude as in some experimental studies, 60 but shorter as in AFM experiments. 54 The two top panels of Figure 1 show the two enantiomers.…”

mentioning

confidence: 99%

Role of Exchange Interactions in the Magnetic Response and Intermolecular Recognition of Chiral Molecules

et al. 2020

Self Cite

View full text Add to dashboard Cite

The physical origin of so called Chirality-Induced Spin Selectivity (CISS) effect has puzzled experimental and theoretical researchers over the past few years. Early experiments were interpreted in terms of unconventional spin-orbit interactions mediated by the helical geometry. However, more recent experimental studies have clearly revealed that electronic exchange interactions also play a key role in the magnetic response of chiral molecules in singlet states. In this investigation, we use spin polarized closed-shell Density-Functional Theory calculations to address the influence of exchange contributions to the interaction between helical molecules as well as of helical molecules with magnetized substrates. We show that exchange effects result in differences in the interaction properties with magnetized surfaces, shedding light into the possible origin of two recent important experimental results: enantiomer separation and Magnetic Exchange Force Microscopy with AFM tips functionalized with helical peptides.

show abstract

“…In recent years it was found that current passing through chiral molecules exhibits spin preference, an effect known as the Chiral Induced Spin Selectivity (CISS) effect. − It is known that this spin-filtering effect may affect the coupling between semiconductor nanocrystals (Quantum Dots, QDs). Indeed, it was shown that for samples of CdSe heterosized QDs, coupled via chiral linkers, an enhancement in the electron wave function delocalization as a function of the induced excited spin direction was observed . In other words, when the excited spin direction agrees well with the organic linker chirality, the coupling strength of the neighboring QDs increases, facilitating energy distribution between the dots even through a long chiral molecule (2.2 nm).…”

mentioning

confidence: 99%

Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential

Fridman

Manis‐Levy

Meir

et al. 2023

J. Phys. Chem. Lett.

Self Cite

View full text Add to dashboard Cite

In recent years, it was found that current passing through chiral molecules exhibits spin preference, an effect known as Chiral Induced Spin Selectivity (CISS). The effect also enables the reduction of scattering and therefore enhances delocalization. As a result, the delocalization of an exciton generated in the dots is not symmetric and relates to the electronic and hole excited spins. In this work utilizing fast spectroscopy on hybrid multilayered QDs with a chiral polypeptide linker system, we probed the interdot chiral coupling on a short time scale. Surprisingly, we found strong coherent coupling and delocalization despite having long 4nm chiral linkers. We ascribe the results to asymmetric delocalization that is controlled by the electron spin. The effect is not measured when using shorter nonchiral linkers. As the system mimics light-harvesting antennas, the results may shed light on a mechanism of fast and efficient energy transfer in these systems.

show abstract

Spin-Exciton Delocalization Enhancement in Multilayer Chiral Linker/Quantum Dot Structures

Cited by 9 publications

References 44 publications

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

Ligand-induced chirality and optical activity in semiconductor nanocrystals: theory and applications

Role of Exchange Interactions in the Magnetic Response and Intermolecular Recognition of Chiral Molecules

Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential

Contact Info

Product

Resources

About