Effect of lattice distortion on spin admixture and quantum transport in organic devices with spin-orbit coupling

doi:10.1088/1674-1056/ad35ae

Abstract With an extended Su-Schrieffer-Heeger model and Green's function method, the spin-orbit coupling (SOC) effects on spin admixture of electronic states and quantum transport in organic devices are investigated. The role of lattice distortion induced by the strong electron-lattice interaction in organics is clarified in contrast with a uniform chain. The results demonstrate an enhanced SOC effect on the spin admixture of frontier eigenstates by the lattice distortion at a larger SOC, which is explained by the perturbation theory. The quantum transport under the SOC is calculated for both nonmagnetic and ferromagnetic electrodes. A more notable SOC effect on total transmission and current is observed for ferromagnetic electrodes, where spin filtering induced by spin-flipped transmission and suppression of magnetoresistance are obtained. Unlike the spin admixture, a stronger SOC effect on transmission exists for the uniform chain rather than the organic lattices with distortion. The reason is attributed to the modified spin-polarized conducting states in the electrodes by lattice configuration, and hence the spin-flip transmission, instead of the spin admixture of eigenstates. This work is helpful to understand the SOC effect in organic spin valves in the presence of lattice distortion.

Keywords: organic spintronics spin-orbit coupling spin admixture quantum transport

Received: 21 December 2023
Revised: 04 March 2024
Accepted manuscript online: 20 March 2024

PACS:	71.70.Ej	(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
	73.43.Qt	(Magnetoresistance)
	05.60.Gg	(Quantum transport)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974215, 21933002, and 12274264).

Corresponding Authors: Guichao Hu
E-mail: hgc@sdnu.edu.cn

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Ying Wang(王莹), Dan Li(李丹), Xinying Sun(孙新英), Huiqing Zhang(张惠晴), Han Ma(马晗), Huixin Li(李慧欣), Junfeng Ren(任俊峰), Chuankui Wang(王传奎), and Guichao Hu(胡贵超) Effect of lattice distortion on spin admixture and quantum transport in organic devices with spin-orbit coupling 2024 Chin. Phys. B 33 077101

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