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Controlling Spin Interference in Single Radical Molecules.

ABSTRACT: Quantum interference (QI) dominates the electronic properties of single molecules even at room temperature and can lead to a large change in their electrical conductance. To take advantage of this for nanoelectronic applications, a mechanism to electronically control QI in single molecules needs to be developed. In this paper, we demonstrate that controlling the quantum interference of each spin in a stable open-shell organic radical with a large π-system is possible by changing the spin state of the radical. We show that the counterintuitive constructive spin interference in a meta-connected radical changes to destructive interference by changing the spin state of the radical from a doublet to a singlet. This results in a significant change in the room temperature electrical conductance by several orders of magnitude, opening up new possibilities for spin interference based molecular switches for energy storage and conversion applications.

SUBMITTER: Chelli Y

PROVIDER: S-EPMC10176569 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Controlling Spin Interference in Single Radical Molecules.

Chelli Yahia Y Sandhu Serena S Daaoub Abdalghani H S AHS Sangtarash Sara S Sadeghi Hatef H

Nano letters 20230418 9

Quantum interference (QI) dominates the electronic properties of single molecules even at room temperature and can lead to a large change in their electrical conductance. To take advantage of this for nanoelectronic applications, a mechanism to electronically control QI in single molecules needs to be developed. In this paper, we demonstrate that controlling the quantum interference of each spin in a stable open-shell organic radical with a large π-system is possible by changing the spin state o ...[more]

PMID: 37071608

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