Large negative differential conductance in single-molecule break junctions

2014 ◽  
Vol 9 (10) ◽  
pp. 830-834 ◽  
Author(s):  
Mickael L. Perrin ◽  
Riccardo Frisenda ◽  
Max Koole ◽  
Johannes S. Seldenthuis ◽  
Jose A. Celis Gil ◽  
...  
Keyword(s):  
Single Molecule ◽  
Differential Conductance ◽  
Negative Differential Conductance ◽  
Break Junctions

New Approach to Negative Differential Conductance with High Peak-to-Valley Ratio in Silicon

2000 ◽  
Vol 39 (Part 1, No. 4B) ◽  
pp. 2246-2250 ◽  
Author(s):  
Junji Koga ◽  
Celine Vanderstraeten ◽  
Shin-ichi Takagi ◽  
Akira Toriumi
Keyword(s):  
High Peak ◽  
Differential Conductance ◽  
Negative Differential Conductance ◽  
New Approach ◽  
Peak To Valley Ratio

Measurement and control of detailed electronic properties in a single molecule break junction

2014 ◽  
Vol 174 ◽  
pp. 91-104 ◽  
Author(s):  
Kun Wang ◽  
Joseph Hamill ◽  
Jianfeng Zhou ◽  
Cunlan Guo ◽  
Bingqian Xu
Keyword(s):  
Data Analysis ◽  
Molecular Electronics ◽  
Single Molecule ◽  
Molecular Orbitals ◽  
Break Junction ◽  
Break Junctions ◽  
Single Molecule Level ◽  
Analysis Techniques ◽  
Future Design ◽  
Molecule Junction

The lack of detailed experimental controls has been one of the major obstacles hindering progress in molecular electronics. While large fluctuations have been occurring in the experimental data, specific details, related mechanisms, and data analysis techniques are in high demand to promote our physical understanding at the single-molecule level. A series of modulations we recently developed, based on traditional scanning probe microscopy break junctions (SPMBJs), have helped to discover significant properties in detail which are hidden in the contact interfaces of a single-molecule break junction (SMBJ). For example, in the past we have shown that the correlated force and conductance changes under the saw tooth modulation and stretch–hold mode of PZT movement revealed inherent differences in the contact geometries of a molecular junction. In this paper, using a bias-modulated SPMBJ and utilizing emerging data analysis techniques, we report on the measurement of the altered alignment of the HOMO of benzene molecules with changing the anchoring group which coupled the molecule to metal electrodes. Further calculations based on Landauer fitting and transition voltage spectroscopy (TVS) demonstrated the effects of modulated bias on the location of the frontier molecular orbitals. Understanding the alignment of the molecular orbitals with the Fermi level of the electrodes is essential for understanding the behaviour of SMBJs and for the future design of more complex devices. With these modulations and analysis techniques, fruitful information has been found about the nature of the metal–molecule junction, providing us insightful clues towards the next step for in-depth study.

scholarly journals Giant Spin Current Rectification Due to the Interplay of Negative Differential Conductance and a Non-Uniform Magnetic Field

Entropy ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1311
Author(s):  
Kang Hao Lee ◽  
Vinitha Balachandran ◽  
Ryan Tan ◽  
Chu Guo ◽  
Dario Poletti
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Spin Current ◽  
System Size ◽  
Differential Conductance ◽  
Many Body ◽  
Negative Differential Conductance ◽  
Ferromagnetic Domains ◽  
Current Rectification ◽  
High Degree

In XXZ chains with large enough interactions, spin transport can be significantly suppressed when the bias of the dissipative driving becomes large enough. This phenomenon of negative differential conductance is caused by the formation of two oppositely polarized ferromagnetic domains at the edges of the chain. Here, we show that this many-body effect, combined with a non-uniform magnetic field, can allow for a high degree of control of the spin current. In particular, by studying all of the possible shapes of local magnetic fields potentials, we find that a configuration in which the magnetic field points up for half of the chain and down for the other half, can result in giant spin-current rectification, for example, up to 108 for a system with only 8 spins. Our results show clear indications that the rectification can increase with the system size.

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