Diode effect in Shapiro steps in an asymmetric SQUID with a superconducting nanobridge
Dmitrii S. Kalashnikov, Gleb S. Seleznev, Andrei Kudriashov, Ian Babich, Denis Yu. Vodolazov, Yakov V. Fominov, Vasily S. Stolyarov
DOI 10.1103/zvzr-flw6 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We investigate the Josephson diode effect in an asymmetric SQUID consisting of a sinusoidal Josephson junction formed by a Bi2Te2Se flake and a superconducting Nb nanobridge with a linear and multivalued current-phase relation (CPR). Current-voltage characteristics were measured both in the absence (dc regime) and presence (ac regime) of external microwave irradiation. Our dc measurements reveal only weak critical current asymmetry (i.e. weak Josephson diode effect), while confirming the multivalued behavior of the SQUID. At the same time, the key finding of this work is the observation of strong Shapiro step asymmetry (concerning the dc current direction) in the ac regime at finite magnetic flux. This peculiarity oscillates as a function of magnetic field with the SQUID's periodicity and varies nonmonotonically with the increase in microwave power. Our theoretical model shows that the pronounced Shapiro step asymmetry, despite the small diode effect in critical current, arises from the interplay between the sinusoidal and multivalued CPRs of the junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Half-integer Shapiro steps in strong ferromagnetic Josephson junctions
similarity 0.94Yunyan Yao et al.
Source status unknown — claims are unverified
Phase-Dependent Resistance in a Superconductor-Two-Dimensional-Electron-Gas Quasiparticle Interferometer
similarity 0.93A. Dimoulas et al.
Source status unknown — claims are unverified
Asymmetric higher-harmonic SQUID as a Josephson diode
similarity 0.93Ya. V. Fominov & D. S. Mikhailov
Source status unknown — claims are unverified
Microwave-tunable diode effect in asymmetric SQUIDs with topological Josephson junctions
similarity 0.92Joseph J. Cuozzo et al.
Source status unknown — claims are unverified
Charge transport through ultrasmall single and double Josephson junctions coupled to resonant modes of the electromagnetic environment
similarity 0.92Yu. A. Pashkin et al.
Source status unknown — claims are unverified
Properties of superconducting planar resonators at millikelvin temperatures
similarity 0.92T. Lindström et al.
Source status unknown — claims are unverified