The effect of external electric fields on silicon with superconducting gallium nano-precipitates
arXiv:1911.06931 · doi:10.1063/5.0002460
Abstract
Motivated by potential transformative applications of nanoelectronic circuits that incorporate superconducting elements, and by the advantages of integrating these elements in a silicon materials platform, we investigate the properties of the superconductivity of silicon ion-implanted with gallium. Here we measure 40 different samples and explore both a variety of preparation methods (yielding both superconducting and non-superconducting samples), and the reproducibility of one of the preparation methods yielding superconducting samples. While we find agreement with the existing literature that superconducting effects are visible in this system, we also find that this superconductivity is not influenced by voltages applied to a top gate. The superconductivity in this materials system is not gateable for applied electric fields as large as 8 MV/cm. We also present results of scanning transmission electron microscopy imaging of some of the same samples for which we report electronic characterization. In agreement with the existing literature, we find that the presence of Ga precipitates is essential to the presence of a superconducting transition in these samples. However, we also find evidence for large inhomogeneities in this system, which we discuss in connection with the lack of gateability we report here.
arXiv comment22 pages, 6 figures
References in corpus (10)
- Quantized Majorana conductance
- Tunable Supercurrent Through Semiconductor Nanowires
- A Semiconductor Nanowire-Based Superconducting Qubit
- Ge/Si nanowire mesoscopic Josephson junctions
- Majorana fermions in superconducting nanowires without spin-orbit coupling
- Cryogenic MOS Transistor Model
- Gate-controlled quantum dots and superconductivity in planar germanium
- Designing Nanomagnet Arrays for Topological Nanowires in Si
- Superconducting-semiconductor quantum devices: from qubits to particle detectors
- Optical study of superconducting Ga-rich layers in silicon