Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
Zoltán Scherübl, Máté Sütő, Dávid Kóti, Endre Tóvári, Csaba Horváth, Tamás Kalmár, Bence Vasas, Martin Berke, Magdhi Kirti, Giorgio Biasiol, Szabolcs Csonka, Péter Makk, Gergő Fülöp
DOI 10.1103/PhysRevResearch.7.023173 · Physical Review Research
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Abstract
Semiconductor-superconductor hybrid nanocircuits are of high interest because of their potential applications in quantum computing. Semiconductors with strong spin-orbit coupling and large g factor are particularly attractive since they are the basic building blocks of novel qubit architectures. However, for the engineering of these complex circuits, the building blocks must be characterized in detail. We have investigated a Josephson junction where the weak link is a two-dimensional electron gas (2DEG) hosted in an InAs/InGaAs heterostructure grown on a GaAs substrate. We employed the in situ epitaxially grown Al layer as a superconducting contact to form an rf SQUID, and also to create a microwave resonator for sensing the Josephson inductance. We determined the gate-dependent current-phase relation and observed supercurrent interference in out-of-plane magnetic fields. With the application of an in-plane magnetic field, we induced asymmetry in the interference pattern, which was found to be anisotropic in the device plane.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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