AFM‐Based Spin‐Exchange Microscopy Using Chiral Molecules

Ziv, Amir; Saha, Abhijit; Alpern, Hen; Sukenik, Nir; Baczewski, L. T.; Yochelis, Shira; Reches, Meital; Paltiel, Yossi

doi:10.1002/adma.201904206

Cited by 59 publications

(89 citation statements)

References 24 publications

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“…However, Refs. 6 , 30 , 31 have pointed out that the transient spin polarization is induced by the charge redistribution among the molecule and the substrate, which we call the charge transfer. We state that the charge transfer is already chirality-dependent as the driving force of the chiral selection.…”

Section: Magnetoresistance and Magnetic Chiral Separationmentioning

confidence: 99%

Chirality-driven topological electronic structure of DNA-like materials

et al. 2021

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Topological aspects of the geometry of DNA and similar chiral molecules have received a lot of attention, while the topology of their electronic structure is less explored. Previous experiments have revealed that DNA can efficiently filter spin-polarized electrons between metal contacts, a process called chiral-induced spin-selectivity (CISS). However, the underlying correlation between chiral structure and electronic spin remains elusive. In this work, we reveal an orbital texture in the band structure, a topological characteristic induced by the chirality. We find that this orbital texture enables the chiral molecule to polarize the quantum orbital. This orbital polarization effect (OPE) induces spin polarization assisted by the spin-orbit interaction from a metal contact and leads to magnetorestistance and chiral separation. The orbital angular momentum of photoelectrons also plays an essential role in related photoemission experiments. Beyond CISS, we predict that OPE can induce spin-selective phenomena even in achiral but inversion-breaking materials.

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Section: Magnetoresistance and Magnetic Chiral Separationmentioning

confidence: 99%

Chirality-driven topological electronic structure of DNA-like materials

et al. 2021

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“…Related to these observations are also the results showing strongly enantiomer dependent binding energies on ferromagnetic metals. 48 − 51 Enantiomer separation was addressed theoretically in ref ( 41 ). For molecules in contact with ferromagnetic metal, the electronic exchange plays a crucial role in the magnetic response.…”

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confidence: 99%

Charge Redistribution and Spin Polarization Driven by Correlation Induced Electron Exchange in Chiral Molecules

Fransson

2021

Nano Lett.

100

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Chiral induced spin selectivity is a phenomenon that has been attributed to chirality, spin–orbit interactions, and nonequilibrium conditions, while the role of electron exchange and correlations have been investigated only marginally until very recently. However, as recent experiments show that chiral molecules acquire a finite spin-polarization merely by being in contact with a metallic surface, these results suggest that electron correlations play a more crucial role for the emergence of the phenomenon than previously thought. Here, it is demonstrated that molecular vibrations give rise to molecular charge redistribution and accompany spin-polarization when coupling a chiral molecule to a nonmagnetic metal. The presented theory opens up new routes to construct a comprehensive picture of enantiomer separation.

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“…Consequently, the emergence of these dipoles implies that at each electric pole, there is at least a fraction of an unpaired electron, i.e., spin polarization is intrinsically associated with the electric dipole formation in chiral molecules. The concept of charge polarization accompanied by spin polarization was veri ed in experiments in which the interaction of chiral molecules with ferromagnetic substrates was probed 19,20 .…”

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confidence: 99%

Evidence for new enantiospecific interaction force in chiral biomolecules

Kapon

Saha

Duanis‐Assaf

et al. 2021

Chem

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Enantiospeci c biorecognition interactions are key to many biological events. Commonly, bio-a nity values, measured in these processes, are higher than those calculated by available methods. We report here the rst direct measurement of the interaction force between right and left handed helical polyalanine peptides using atomic force microscope (AFM) and calculations based on a simple theoretical model. A force difference of 60pN between same and opposite enantiomer interactions is measured. Additional measurements show spin dependency and fast decay of the interaction term, consistent with spin exchange interactions. This short range enantiospeci c interaction term is especially relevant in crowded biological systems. The results shed light on the importance of spin and exchange interactions in biological processes, providing explanation to the discrepancies between past calculations and experiments. Main TextNature is based on chiral molecules, namely molecules that appear in two forms, enantiomers, that are mirror images of each other. Interestingly, chiral biomolecules, like proteins and sugars appear in Nature mainly as one enantiomer. The origin of "homo chirality" in Nature, was -and is -discussed very intensively in the literature 1 . However, the focus of this work is related to a more fundamental question, i.e., why did Nature preserve chirality so persistently over the many millions years of evolution? In other words, does chirality per se, independent on the speci c handedness, provide properties that serve an important role in Life?The ability of biological molecules to interact selectively with each other is at the heart of all biological processes and the basis of many pharmaceutical concepts. Two important properties -related to chirality -characterize interactions in nature, i.e., very strong enantioselectivity

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AFM‐Based Spin‐Exchange Microscopy Using Chiral Molecules

Cited by 59 publications

References 24 publications

Chirality-driven topological electronic structure of DNA-like materials

Chirality-driven topological electronic structure of DNA-like materials

Charge Redistribution and Spin Polarization Driven by Correlation Induced Electron Exchange in Chiral Molecules

Evidence for new enantiospecific interaction force in chiral biomolecules

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