Regulation strategies based on quantum interference in electrical transport of single-molecule devices

doi:10.7498/aps.70.20211819

Abstract

Highlights

分子结的法诺系数;(e)银/钒烯/银单分子结垂直构型电子输运路径;(f)不同输运路径的自旋分辨电子输运透射概率。 Fig 6 (a) Schematic of the Ag/vanadocene/Ag molecular junction of spin filter that induced by quantum interference; (b) Schematic of the Ag/vanadocene molecular spin polarization junction; (c-d) Fano factor of Ag/vanadocene/Ag and Ag/ferrocene/Ag junctions respectively; (e) Spin transmission across the junction of perpendicular molecular junction; (f) Spin transmission in different charge transport pathways
Liu J, Huang X, Wang F, Hong W 2019 Acc. Chem

Summary

Introduction

图 2 (a)分子结的电学测量示意图;(b)分子结的电输运原理图;(c)分别为通过苯环的对位和间位进行连接的分子上的电输运通路;(d)具有相增量子干涉效应(红色)和相消量子干涉效应(蓝色)的分子的透射谱。 Fig 2 (a) Schematic of the electrical measurement of molecular junction; (b) The mechanism of electron transport in a molecular junction; (c) Different electron transport pathways in Para and Meta site connected benzene ring; (d) The transmission spectrum of molecules with CQI (red) and DQI (blue) effects respectively. 当 E 在 HOMO-LUMO 间隙中间时有 E = ε0,可以得到此时 k(E) = π/2。由于电图 3 (a)分子 AC,AQ 和 AH 的结构;(b-d)分别为 AC,AQ 和 AH 的单分子一维电导图;(e)分子 AQ-DT,AQ-MT,AC-DT 以及 OPE3-DT 的分子结构; (f-g)分别为 AC-DT 和 AQ-DT 分子层的 I-V 特性曲线;(h)理论计算的 AQMT,AC-DT 以及 AQ-DT 的透射谱。 Fig 3 (a) The molecular structure of AC, AQ and AH respectively; (b-d) The 1D Conductance histogram of AC, AQ and AH respectively; (e) The molecular structure of AQ-DT, AQ-MT, AC-DT and OPE3-DT; (f-g) The 2D I-V histogram of AC-DT and AQ-DT respectively; (g) The transmission spectrum of AQ-MT, AC-DT, and AQ-DT.

Results

Conclusion