High mobility stemless InSb nanowires

\u3cp\u3eHigh aspect-ratio InSb nanowires (NWs) of high chemical purity are sought for implementing advanced quantum devices. The growth of InSb NWs is challenging, generally requiring a stem of a foreign material for nucleation. Such a stem tends to limit the length of InSb NWs and its material becomes incorporated in the InSb segment. Here, we report on the growth of chemically pure InSb NWs tens of microns long. Using a selective-area mask in combination with gold as a catalyst allows complete omission of the stem, thus demonstrating that InSb NWs can grow directly from the substrate. The introduction of the selective-area mask gives rise to novel growth kinetics, demonstrating high growth rates and complete suppression of layer deposition on the mask for Sb-rich conditions. The crystal quality and chemical purity of these NWs is reflected in the significant enhancement of low-temperature electron mobility, yielding an average of 4.4 × 10\u3csup\u3e4\u3c/sup\u3e cm\u3csup\u3e2\u3c/sup\u3e/(V s), compared to previously studied InSb NWs grown on stems.\u3c/p\u3

Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands

\u3cp\u3eThe number of electrons in small metallic or semiconducting islands is quantised. When tunnelling is enabled via opaque barriers this number can change by an integer. In superconductors the addition is in units of two electron charges (2e), reflecting that the Cooper pair condensate must have an even parity. This ground state (GS) is foundational for all superconducting qubit devices. Here, we study a hybrid superconducting-semiconducting island and find three typical GS evolutions in a parallel magnetic field: a robust 2e-periodic even-parity GS, a transition to a 2e-periodic odd-parity GS, and a transition from a 2e- to a 1e-periodic GS. The 2e-periodic odd-parity GS persistent in gate-voltage occurs when a spin-resolved subgap state crosses zero energy. For our 1e-periodic GSs we explicitly show the origin being a single zero-energy state gapped from the continuum, i.e., compatible with an Andreev bound states stabilized at zero energy or the presence of Majorana zero modes.\u3c/p\u3

Dataset underlying the paper: Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands

Data for the figures in the paper 'Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands

A full parity phase diagram of a proximitized nanowire island: Data and Code

This repository gathers the data analysis and plotting code required to reproduce the results of our work "A full parity phase diagram of a proximitized nanowire island"

A full parity phase diagram of a Majorana island: Data and Code

This repository gathers the data analysis and plotting code required to reproduce the results of our work "A full parity phase diagram of a Majorana island".</div

A full parity phase diagram of a proximitized nanowire island: Data and Code

This repository gathers the data analysis and plotting code required to reproduce the results of our work "A full parity phase diagram of a proximitized nanowire island".</div

A full parity phase diagram of a proximitized nanowire island: Data and Code

This repository gathers the data analysis and plotting code required to reproduce the results of our work "A full parity phase diagram of a Majorana island".</div

A full parity phase diagram of a proximitized nanowire island: Data and Code

This repository gathers the data analysis and plotting code required to reproduce the results of our work "A full parity phase diagram of a proximitized nanowire island".</div