Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 8, Pages 1590-1593Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.1590
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We have measured the differential conductance of a tunnel junction between a thin metallic wire and a thick ground plane, as a function of the applied voltage. We find that near zero voltage, the differential conductance exhibits a dip, which scales as 1/rootV down to voltages V similar to 10k(B)T/e. Th; precise voltage and temperature dependence of the differential conductance is accounted fur by the effect on the tunneling density of states of the macroscopic electrodynamics contribution to electron-electron interaction, and not by the short-ranged screened-Coulomb repulsion at microscopic scales.
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