Microwave-Tunable Diode Effect in Asymmetric SQUIDs with Topological Josephson Junctions
Physical Review Research(2023)
摘要
In superconducting systems in which inversion and time-reversal symmetry are
simultaneously broken the critical current for positive and negative current
bias can be different. For superconducting systems formed by Josephson
junctions (JJs) this effect is termed Josephson diode effect. In this work, we
study the Josephson diode effect for a superconducting quantum interference
device (SQUID) formed by a topological JJ with a 4π-periodic current-phase
relationship and a topologically trivial JJ. We show how the fractional
Josephson effect manifests in the Josephson diode effect with the application
of a magnetic field and how tuning properties of the trivial SQUID arm can lead
to diode polarity switching. We then investigate the AC response and show that
the polarity of the diode effect can be tuned by varying the AC power and
discuss differences between the AC diode effect of asymmetric SQUIDs with no
topological JJ and SQUIDs in which one JJ is topological.
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