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

doi:10.1088/1674-1056/ad35ae

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77101-077101.doi: 10.1088/1674-1056/ad35ae

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

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)†

School of Physics and Electronics, Shandong Normal University, Jinan 250358, China

收稿日期:2023-12-21 修回日期:2024-03-04 接受日期:2024-03-20 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Guichao Hu E-mail:hgc@sdnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974215, 21933002, and 12274264).

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

School of Physics and Electronics, Shandong Normal University, Jinan 250358, China

Received:2023-12-21 Revised:2024-03-04 Accepted:2024-03-20 Online:2024-06-18 Published:2024-06-18
Contact: Guichao Hu E-mail:hgc@sdnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974215, 21933002, and 12274264).

摘要/Abstract

摘要： 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.

关键词: organic spintronics, spin-orbit coupling, spin admixture, quantum transport

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.

Key words: organic spintronics, spin-orbit coupling, spin admixture, quantum transport

中图分类号: (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

71.70.Ej

73.43.Qt (Magnetoresistance) 05.60.Gg (Quantum transport)

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[J]. 中国物理B, 2024, 33(7): 77101-077101.

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

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

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