Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions

Sadashige Matsuo (), Takaya Imoto, Tomohiro Yokoyama (), Yosuke Sato, Tyler Lindemann, Sergei Gronin, Geoffrey C. Gardner, Sho Nakosai, Yukio Tanaka, Michael J. Manfra and Seigo Tarucha ()
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Sadashige Matsuo: Center for Emergent Matter Science, RIKEN
Takaya Imoto: Center for Emergent Matter Science, RIKEN
Tomohiro Yokoyama: Osaka University
Yosuke Sato: Center for Emergent Matter Science, RIKEN
Tyler Lindemann: Purdue University
Sergei Gronin: Purdue University
Geoffrey C. Gardner: Purdue University
Sho Nakosai: Nagoya University
Yukio Tanaka: Nagoya University
Michael J. Manfra: Purdue University
Seigo Tarucha: Center for Emergent Matter Science, RIKEN

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs forms Andreev molecule states (AMSs), which provide a new ingredient to engineer exotic SC phenomena such as topological SC states and Andreev qubits. Here we provide tunneling spectroscopy measurements on a device consisting of two electrically controllable planar JJs sharing a single SC electrode. We discover that Andreev spectra in the coupled JJ are highly modulated from those in the single JJs and possess phase-dependent AMS features reproduced in our numerical calculation. Notably, the SC gap closing due to the AMS formation is experimentally observed. Our results help in understanding SC transport derived from the AMS and promoting the use of AMS physics to engineer topological SC states and quantum information devices.

Date: 2023
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DOI: 10.1038/s41467-023-44111-3

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