Abstract
The tunnel current from a normal cylindrical conductor placed into a weak longitudinal magnetic field is calculated. It is assumed that within the microcylinder the conditions for the quantum size effect are realized. It is shown that under a constant bias at the junction the oscillating current component contains two terms. One of them describes aperiodic current changes in the function of the direct magnetic field, the other has a period with the respect to the magnetic flux equal to hc/e. In the fixed magnetic field the tunnel current oscillates in the function of voltage, which permits the effective masses of quasi-particles to be found from the oscillation period. The estimates show that the relative oscillation amplitude is not small for metals having low effective masses of electrons.
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