中国物理B ›› 2020, Vol. 29 ›› Issue (8): 88503-088503.doi: 10.1088/1674-1056/ab90f2

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

Exploring how hydrogen at gold-sulfur interface affects spin transport in single-molecule junction

Jing Zeng(曾晶), Ke-Qiu Chen(陈克求), Yanhong Zhou(周艳红)   

  1. 1 College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China;
    2 Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
    3 Hunan Provincial Key Laboratory of Intelligent Information Processing and Application, Hengyang 421002, China;
    4 College of Science, East China Jiao Tong University, Nanchang 330013, China
  • 收稿日期:2020-03-06 修回日期:2020-04-02 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Jing Zeng, Ke-Qiu Chen E-mail:zengjing@hynu.edu.cn;keqiuchen@hnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11674092, 11804093, and 61764005), the Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ40006), the Scientific Research Fund of the Education Department of Hunan Province, China (Grant No. 18B368), the Science and Technology Development Plan Project of Hengyang City, China (Grant No. 2018KJ121), and the Science and Technology Plan Project of Hunan Province, China (Grant No. 2016TP1020).

Exploring how hydrogen at gold-sulfur interface affects spin transport in single-molecule junction

Jing Zeng(曾晶)1,3, Ke-Qiu Chen(陈克求)2, Yanhong Zhou(周艳红)4   

  1. 1 College of Physics and Electronic Engineering, Hengyang Normal University, Hengyang 421002, China;
    2 Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
    3 Hunan Provincial Key Laboratory of Intelligent Information Processing and Application, Hengyang 421002, China;
    4 College of Science, East China Jiao Tong University, Nanchang 330013, China
  • Received:2020-03-06 Revised:2020-04-02 Online:2020-08-05 Published:2020-08-05
  • Contact: Jing Zeng, Ke-Qiu Chen E-mail:zengjing@hynu.edu.cn;keqiuchen@hnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11674092, 11804093, and 61764005), the Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ40006), the Scientific Research Fund of the Education Department of Hunan Province, China (Grant No. 18B368), the Science and Technology Development Plan Project of Hengyang City, China (Grant No. 2018KJ121), and the Science and Technology Plan Project of Hunan Province, China (Grant No. 2016TP1020).

摘要: Very recently, experimental evidence showed that the hydrogen is retained in dithiol-terminated single-molecule junction under the widely adopted preparation conditions, which is in contrast to the accepted view[Nat. Chem. 11 351 (2019)]. However, the hydrogen is generally assumed to be lost in the previous physical models of single-molecule junctions. Whether the retention of the hydrogen at the gold-sulfur interface exerts a significant effect on the theoretical prediction of spin transport properties is an open question. Therefore, here in this paper we carry out a comparative study of spin transport in M-tetraphenylporphyrin-based (M=V, Cr, Mn, Fe, and Co; M-TPP) single-molecule junction through Au-SR and Au-S(H)R bondings. The results show that the hydrogen at the gold-sulfur interface may dramatically affect the spin-filtering efficiency of M-TPP-based single-molecule junction, depending on the type of transition metal ions embedded into porphyrin ring. Moreover, we find that for the Co-TPP-based molecular junction, the hydrogen at the gold-sulfur interface has no obvious effect on transmission at the Fermi level, but it has a significant effect on the spin-dependent transmission dip induced by the quantum interference on the occupied side. Thus the fate of hydrogen should be concerned in the physical model according to the actual preparation condition, which is important for our fundamental understanding of spin transport in the single-molecule junctions. Our work also provides guidance in how to experimentally identify the nature of gold-sulfur interface in the single-molecule junction with spin-polarized transport.

关键词: transport properties, molecular electronic devices, gold-sulfur interface, density-functional theory, nonequilibrium Green's functions

Abstract: Very recently, experimental evidence showed that the hydrogen is retained in dithiol-terminated single-molecule junction under the widely adopted preparation conditions, which is in contrast to the accepted view[Nat. Chem. 11 351 (2019)]. However, the hydrogen is generally assumed to be lost in the previous physical models of single-molecule junctions. Whether the retention of the hydrogen at the gold-sulfur interface exerts a significant effect on the theoretical prediction of spin transport properties is an open question. Therefore, here in this paper we carry out a comparative study of spin transport in M-tetraphenylporphyrin-based (M=V, Cr, Mn, Fe, and Co; M-TPP) single-molecule junction through Au-SR and Au-S(H)R bondings. The results show that the hydrogen at the gold-sulfur interface may dramatically affect the spin-filtering efficiency of M-TPP-based single-molecule junction, depending on the type of transition metal ions embedded into porphyrin ring. Moreover, we find that for the Co-TPP-based molecular junction, the hydrogen at the gold-sulfur interface has no obvious effect on transmission at the Fermi level, but it has a significant effect on the spin-dependent transmission dip induced by the quantum interference on the occupied side. Thus the fate of hydrogen should be concerned in the physical model according to the actual preparation condition, which is important for our fundamental understanding of spin transport in the single-molecule junctions. Our work also provides guidance in how to experimentally identify the nature of gold-sulfur interface in the single-molecule junction with spin-polarized transport.

Key words: transport properties, molecular electronic devices, gold-sulfur interface, density-functional theory, nonequilibrium Green's functions

中图分类号:  (Molecular electronic devices)

  • 85.65.+h
73.40.-c (Electronic transport in interface structures) 73.63.-b (Electronic transport in nanoscale materials and structures)