Transport studies in a gate-tunable three-terminal Josephson junction

Gino V Graziano, Joon Sue Lee, Mihir Pendharkar, Chris J. Palmstrøm, Vlad S. Pribiag

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44 Scopus citations


Josephson junctions with three or more superconducting leads have been predicted to exhibit topological effects in the presence of few conducting modes within the interstitial normal material. Such behavior, of relevance for topologically protected quantum bits, would lead to specific transport features measured between terminals, with topological phase transitions occurring as a function of phase and voltage bias. Although conventional, two-terminal Josephson junctions have been studied extensively, multiterminal devices have received relatively little attention to date. Motivated in part by the possibility to ultimately observe topological phenomena in multiterminal Josephson devices, as well as their potential for coupling gatemon qubits, here we describe the superconducting features of a top-gated mesoscopic three-terminal Josephson device. The device is based on an InAs two-dimensional electron gas proximitized by epitaxial aluminum. We map out the transport properties of the device as a function of bias currents, top gate voltage, and magnetic field. We find a very good agreement between the zero-field experimental phase diagram and a resistively and capacitively shunted junction computational model.

Original languageEnglish (US)
Article number054510
JournalPhysical Review B
Issue number5
StatePublished - Feb 1 2020

Bibliographical note

Funding Information:
We thank A. Levchenko and M. Houzet for helpful discussions. This work was supported primarily by the National Science Foundation under Award No. DMR-1554609. The work at UCSB was supported by the Department of Energy under Award No. DE-SC0019274. The development of the epitaxial growth process was supported by Microsoft Research. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award No. ECCS-1542202.

Publisher Copyright:
© 2020 American Physical Society.


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