Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential

Fridman, Hanna T.; Manis‐Levy, Hadar; Meir, Amitai; Casotto, Andrea; Malkinson, Rotem; Dehnel, Joanna; Yochelis, Shira; Lifshitz, Efrat; Bar‐Gill, Nir; Collini, Elisabetta; Paltiel, Yossi

doi:10.1021/acs.jpclett.2c03743

Cited by 3 publications

(2 citation statements)

References 54 publications

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“…These results demonstrate that pulsed-EPR methods can be used to manipulate coherent spin states, which is essential for quantum gate operations. In other studies, optical excitation of chiral QD systems generates coherent delocalization and charge separation of the exciton on a short time scale. ,, While a number of important basic science questions and technological obstacles remain, the above examples illustrate that chiral materials and structures are capable of generating quantum effects in realistic solid-state devices.…”

Section: Prevalence Of Ciss and Ciss Implicationsmentioning

confidence: 99%

Chiral Induced Spin Selectivity

Bloom,

Paltiel,

Naaman

et al. 2024

Chem. Rev.

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Since the initial landmark study on the chiral induced spin selectivity (CISS) effect in 1999, considerable experimental and theoretical efforts have been made to understand the physical underpinnings and mechanistic features of this interesting phenomenon. As first formulated, the CISS effect refers to the innate ability of chiral materials to act as spin filters for electron transport; however, more recent experiments demonstrate that displacement currents arising from charge polarization of chiral molecules lead to spin polarization without the need for net charge flow. With its identification of a fundamental connection between chiral symmetry and electron spin in molecules and materials, CISS promises profound and ubiquitous implications for existing technologies and new approaches to answering age old questions, such as the homochiral nature of life. This review begins with a discussion of the different methods for measuring CISS and then provides a comprehensive overview of molecules and materials known to exhibit CISS-based phenomena before proceeding to identify structure−property relations and to delineate the leading theoretical models for the CISS effect. Next, it identifies some implications of CISS in physics, chemistry, and biology. The discussion ends with a critical assessment of the CISS field and some comments on its future outlook.

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Section: Prevalence Of Ciss and Ciss Implicationsmentioning

confidence: 99%

Chiral Induced Spin Selectivity

Bloom,

Paltiel,

Naaman

et al. 2024

Chem. Rev.

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“…Coherent multidimensional spectroscopy is a particularly suited technique for characterizing charge and energy-transfer processes, as demonstrated in studies on light-harvesting complexes − and semiconductor nanocrystals. − Indeed, multidimensional maps show transport processes as cross-peaks outside of the diagonal region where population dynamics occur, enabling easy identification and study of these processes. Additionally, coherent phenomena during transport can be discerned by the presence of beatings in the amplitude signal .…”

Section: Introductionmentioning

confidence: 99%

Coherent Vibrations Promote Charge-Transfer across a Graphene-Based Interface

Casotto,

Rukin,

Fresch

et al. 2024

J. Am. Chem. Soc.

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Discerning the impact of the coherent motion of the nuclei on the timing and efficiency of charge transfer at the donor−acceptor interface is essential for designing performance-enhanced optoelectronic devices. Here, we employ an experimental approach using photocurrent detection in coherent multidimensional spectroscopy to excite a donor aromatic macrocycle and collect the charge transferred to a 2D acceptor layer. For this purpose, we prepared a cobalt phthalocyanine-graphene (CoPc−Gr) interface. Unlike blends, the wellordered architecture achieved through the physical separation of the two layers allows us to unambiguously collect the electrical signal from graphene alone and associate it with a microscopic understanding of the whole process. The CoPc−Gr interface exhibits an ultrafast electron-transfer signal, stemming from an interlayer mechanism. Remarkably, the signal presents an oscillating time evolution modulated by coherent vibrations originating from the laser-excited CoPc states. By performing Fourier analysis on the beatings and correlating it with the Raman features, along with a comprehensive first-principles characterization of the vibrational coupling in the CoPc excited states, we successfully identify both the orbitals and molecular vibrations that promote the charge transfer at the interface.

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A chemical perspective on the chiral induced spin selectivity effect

Bloom,

Chen,

et al. 2024

National Science Review

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This review discusses opportunities in chemistry that are enabled by the chiral induced spin selectivity (CISS) effect. Firstly, the review begins with a brief overview of the seminal studies on CISS. Next, we discuss different chiral material systems whose properties can be tailored through chemical means, with a special emphasis on hybrid organic-inorganic layered materials that exhibit some of the largest spin filtering properties to date. Then, we discuss the promise of CISS for chemical reactions and enantioseparation before concluding in the end.

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Ultrafast Coherent Delocalization Revealed in Multilayer QDs under a Chiral Potential

Cited by 3 publications

References 54 publications

Chiral Induced Spin Selectivity

Chiral Induced Spin Selectivity

Coherent Vibrations Promote Charge-Transfer across a Graphene-Based Interface

A chemical perspective on the chiral induced spin selectivity effect

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