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A Quantum Dot in Germanium Proximitized by a Superconductor by Lakic, Lazar; Lawrie, William I. L.; van Driel, David; Stehouwer, Lucas E. A.; Su, Yao; Veldhorst, Menno; Scappucci, Giordano; Kuemmeth, Ferdinand; Chatterjee, Anasua is a scholarly article available to read on EtoBox.

What is A Quantum Dot in Germanium Proximitized by a Superconductor about?

Planar germanium quantum wells have recently been shown to host hard-gapped superconductivity. Additionally, quantum dot spin qubits in germanium are well-suited for quantum information processing, with isotopic purification to a nuclear spin-free material expected to yield long coherence times. Therefore, as one of the few group IV materials with the potential to host superconductor-semiconductor hybrid devices, proximitized quantum dots in germanium is a compelling platform to achieve and combine topological superconductivity with existing and novel qubit modalities. Here we demonstrate a quantum dot (QD) in a Ge/SiGe heterostructure proximitized by a platinum germanosilicide (PtGeSi) superconducting lead (SC), forming a SC-QD-SC junction. We show tunability of the QD-SC coupling strength, as well as gate control of the ratio of charging energy and the induced gap. We further exploit this tunability by exhibiting control of the ground state of the system between even and odd parity. Furthermore, we characterize the critical magnetic field strengths, finding a critical out-of-plane field of 0.90(4). Finally we explore sub-gap spin splitting in the device, observing rich physics in

Author

Lakic, Lazar; Lawrie, William I. L.; van Driel, David; Stehouwer, Lucas E. A.; Su, Yao; Veldhorst, Menno; Scappucci, Giordano; Kuemmeth, Ferdinand; Chatterjee, Anasua

Published

2024

Language

EN