Abstract
The line shape of Fabry-Pérot resonance in Aharonov-Bohm conductance oscillation in a mesoscopic ring is calculated as a function of magnetic phase shift at finite temperatures. The case of the maximum coupling between the ring and leads is considered. It is shown that the 2π periodic series of resonance peaks with height e2/h and width zero at temperature T=0 is broadened as a result of energy dispersion. The peak height is almost kept invariant below 10 K. This is because Fermi energy is far larger than thermal breadth at the step of the Fermi function in this temperature range. Implications of these results are discussed in relation to application to small-area-single-flux-quantum devices.
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