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Controlled crossover of electron transport in graphene nanoconstriction:From Coulomb blockade to electron interference

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Chinese Physics B 2023年第7期32卷 489-494页

作者：余炜郭潇蔡煜文俞晓天梁文杰 Beijing National Center for Condensed Matter Physics Beijing Key Laboratory for Nanomaterials and NanodevicesInstitute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China

The ability to control transport behaviors in nanostructure is crucial for usage as a fundamental research platform as well as a practical *** this study,we report a gate-controlled crossover of electron transport behaviors using graphene nanoconstrictions as a *** observed transport properties span from Coulomb blockade-dominated single electron transmission to electron-wave interference-dominated quantum *** drastic modulation is achieved by utilizing a single back gate on a graphene nanoconstriction structure,where the size of nanostructure in the constriction and coupling strength of it to the electrodes can be tuned *** results indicate that electrostatic field by gate voltage upon the confined nanostructure defines both the size of the nanoconstriction as well as its interaction to *** gate voltage raises Fermi level to cross the energy profile in the nanoconstriction,resulting in decreased energy barriers which affect the size of nanoconstriction and transmissivity of *** gate-tunable nanoconstriction device can therefore become a potential platform to study quantum critical behaviors and enrich electronic and spintronic devices.

关键词： graphene nanoconstriction Coulomb blockade electron interference gate-tunable

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Quantum interference without Wave-Particle Duality

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Journal of Modern Physics 2016年第4期7卷 375-389页

作者： Román Castañeda Giorgio Matteucci Raffaella Capelli Physics School Universidad Nacional de Colombia Sede Medellín Medellín Colombia Department of Physics and Astronomy University of Bologna Bologna Italy CNR—Istituto Officina dei Materiali Trieste Italy

interference of light and material particles is described with a unified model which does not need to assume the wave-particle duality. A moving particle is associated with a region of spatial correlated points named coherence cone. Its geometry depends on photon or particle momentum and on the parameters of the experimental setup. The final interference pattern is explained as a spatial distribution of particles caused by the coherence cone geometry. In the present context, the wave front superposition principle, wave-particle duality and wave-collapse lose their meaning. Fits of observed single electron and single molecule interference patterns together with the simulation of expected near-field molecule interference (Talbot carpet) demonstrate the model validity.

关键词： electron interference Molecule interference Two-Point Correlation Wave-Particle Duality

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