Shot Noise of 1,4-Benzenedithiol Single-Molecule Junctions

被引：46
|
作者：
Karimi, M. A. [1 ]
Bahoosh, S. G. [1 ]
Herz, M. [1 ]
Hayakawa, R. [1 ,2 ]
Pauly, F. [1 ]
Scheer, E. [1 ]
机构：
[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany
[2] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton WPI MANA, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan
来源：
NANO LETTERS | 2016年 / 16卷 / 03期
关键词：
Single-molecule junction; charge transport; low temperature; inelastic electron tunneling spectroscopy; shot noise; density functional theory; ELECTRON-TUNNELING SPECTROSCOPY; CONDUCTANCE; TRANSPORT; CONTACTS; SIZE; SUPPRESSION; CHANNELS; THIOL;
D O I：
10.1021/acs.nanolett.5b04848
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report measurements of the shot noise on single-molecule Au-1,4-benzenedithiol-Au junctions, fabricated with the mechanically controllable break junction (MCBJ) technique at 4.2 K in a wide range of conductance values from 10(-2) to 0.24 conductance quanta. We introduce a simple measurement scheme using a current amplifier and a spectrum analyzer and that does not imply special requirements regarding the electrical leads. The experimental findings provide evidence that the current is carried by a single conduction channel throughout the whole conductance range. This observation suggests that the number of channels is limited by the Au-thiol bonds and that contributions due to direct tunneling from the Au to the pi-system of the aromatic ring are negligible also for high conductance. The results are supported by quantum transport calculations using density functional theory.
引用
收藏
页码：1803 / 1807
页数：5
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