Abstract
Simultaneous breaking of inversion- and time-reversal symmetry in Josephson junction (JJ) leads to a possible violation of the I(φ) = −I(−φ) equality for the current–phase relation. This is known as anomalous Josephson effect and it produces a phase shift φ 0 in sinusoidal current–phase relations. In ballistic JJs with non-sinusoidal current phase relation the observed phenomenology is much richer, including the supercurrent diode effect and the magnetochiral anisotropy (MCA) of Josephson inductance. In this work, we present measurements of both effects on arrays of JJs defined on epitaxial Al/InAs heterostructures. We show that the orientation of the current with respect to the lattice affects the MCA, possibly as the result of a finite Dresselhaus component. In addition, we show that the two-fold symmetry of the Josephson inductance reflects in the activation energy for phase slips.
Highlights
Accepted Manuscript is “the version of the article accepted for publication including all changes made as a result of the peer review process, and which may include the addition to the article by IOP Publishing of a header, an article ID, a cover sheet and/or an ‘Accepted
We study the supercurrent diode effect and the magnetochiral anisotropy (MCA) in Josephson junctions (JJs) arrays with large Rashba spin-orbit interaction (SOI)
Ref. [28]: we show results for different lattice orientations, which we use to estimate the Dresselhaus contribution to the SOI; we study the MCA for the activation energy of thermally activated phase slips, which we connect to the anisotropy of the inductance
Summary
DC transport measurements provide only partial information about single JJs. For instance, the Josephson coupling between the leads is deduced from the critical current — an interesting situation where an equilibrium quantity is deduced from AC transport measurements. The CPR is not accessible without making use of a SQUID geometry in perpendicular magnetic field. Josephson coupling and CPR can instead be directly accessed in single junctions by measuring its Josephson inductance, clearly with AC measurements. Given the CPR relation I = I0 f (φ) (where I0 is the relevant current scale and f is a 2π periodic function) the Josephson inductance immediately emerges from the ratio between
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