Gate controlling of quantum interference and direct observation of anti-resonances in single molecule charge transport
Yueqi Li,Marius Buerkle,Guangfeng Li,Ali Rostamian,Hui Wang,Zixiao Wang,David R. Bowler,David R. Bowler,Tsuyoshi Miyazaki,Limin Xiang,Yoshihiro Asai,Gang Zhou,Nongjian Tao,Nongjian Tao +13 more
TLDR
By tuning the molecule in and out of anti-resonance, this work achieves continuous control of the conductance over two orders of magnitude with a subthreshold swing of ~17 mV dec−1, features relevant to high-speed and low-power electronics.Abstract:
Quantum interference can profoundly affect charge transport in single molecules, but experiments can usually measure only the conductance at the Fermi energy. Because, in general, the most pronounced features of the quantum interference are not located at the Fermi energy, it is highly desirable to probe charge transport in a broader energy range. Here, by means of electrochemical gating, we measure the conductance and map the transmission functions of single molecules at and around the Fermi energy, and study signatures associated with constructive and destructive interference. With electrochemical gate control, we tune the quantum interference between the highest occupied molecular orbital and lowest unoccupied molecular orbital, and directly observe anti-resonance, a distinct feature of destructive interference. By tuning the molecule in and out of anti-resonance, we achieve continuous control of the conductance over two orders of magnitude with a subthreshold swing of ~17 mV dec-1, features relevant to high-speed and low-power electronics.read more
Citations
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Nanoscale Organic Thermoelectric Materials: Measurement, Theoretical Models, and Optimization Strategies
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Nonmagnetic single-molecule spin-filter based on quantum interference.
Atindra Nath Pal,Dongzhe Li,Soumyajit Sarkar,Sudipto Chakrabarti,Ayelet Vilan,Leeor Kronik,Alexander Smogunov,Oren Tal +7 more
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References
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Measurement of Single-Molecule Resistance by Repeated Formation of Molecular Junctions
Bingqian Xu,Nongjian Tao +1 more
TL;DR: The conductance of a single molecule connected to two gold electrodes was determined by repeatedly forming thousands of gold-molecule-gold junctions using conductance histograms, which revealed well-defined peaks at integer multiples of a fundamental conductance value.
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Observation of quantum interference in molecular charge transport
Constant M. Guedon,Hennie Valkenier,Troels Markussen,Kristian Ks Thygesen,Jan Jc Hummelen,Sense Sj van der Molen +5 more
TL;DR: The observation of destructive quantum interference in charge transport through two-terminal molecular junctions at room temperature is reported, and the degree of interference can be controlled by simple chemical modifications of the molecular wire.
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