Experimental studies of electron transport through an edge-fused porphyrin oligomer in a graphene junction are interpreted within a Hubbard dimer framework.
We analyze the noise in room-temperature liquid-gated quantum dots. We demonstrate large amplitude charge noise and two-level fluctuations in the current level which we attribute to charge trapping at the disordered graphene edges.
Since the early days
of quantum mechanics, it has been known that
electrons behave simultaneously as particles and waves, and now quantum
electronic devices can harness this duality. When devices are shrunk
to the molecular scale, it is unclear under what conditions does electron
transmission remain phase-coherent, as molecules are usually treated
as either scattering or redox centers, without considering the wave–particle
duality of the charge carrier. Here, we demonstrate that electron
transmission remains phase-coherent in molecular porphyrin nanoribbons
connected to graphene electrodes. The devices act as graphene Fabry–Pérot
interferometers and allow for direct probing of the transport mechanisms
throughout several regimes. Through electrostatic gating, we observe
electronic interference fringes in transmission that are strongly
correlated to molecular conductance across multiple oxidation states.
These results demonstrate a platform for the use of interferometric
effects in single-molecule junctions, opening up new avenues for studying
quantum coherence in molecular electronic and spintronic devices.
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