Nonequilibrium ac Josephson effect in mesoscopic Nb-InAs-Nb junctions
K.W. Lehnert, N. Argaman, H.-R. Blank, K.C. Wong, S.J. Allen, E.L. Hu,, H. Kroemer (University of California Santa Barbara, Santa Barbara CA)
TL;DR
This paper investigates the nonequilibrium ac Josephson effect in mesoscopic Nb-InAs-Nb junctions, revealing frequency doubling and unique conductance features explained by a dynamical model involving Andreev bound states.
Contribution
It introduces a nonequilibrium dynamical model that explains frequency doubling and conductance enhancement in mesoscopic Josephson junctions under microwave irradiation.
Findings
Frequency-doubled Josephson currents observed at high temperatures.
Half-integer Shapiro steps explained by the model.
Enhanced conductance near zero bias.
Abstract
Microwave irradiation of Nb-InAs-Nb junctions reveals frequency-doubled Josephson currents which persist to high temperatures, in the absence of a critical current. A nonequilibrium dynamical model, based on time-dependent Andreev bound states, successfully accounts for the resulting half-integer Shapiro step and an enhancement in the conductance near zero bias.
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