title: Majorana bound state in a coupled quantum-dot hybrid-nanowire system.
abstract: Hybrid nanowires combining semiconductor and superconductor materials appear well suited for the creation, detection, and control of Majorana bound states (MBSs). We demonstrate the emergence of MBSs from coalescing Andreev bound states (ABSs) in a hybrid InAs nanowire with epitaxial Al, using a quantum dot at the end of the nanowire as a spectrometer. Electrostatic gating tuned the nanowire density to a regime of one or a few ABSs. In an applied axial magnetic field, a topological phase emerges in which ABSs move to zero energy and remain there, forming MBSs. We observed hybridization of the MBS with the end-dot bound state, which is in agreement with a numerical model. The ABS/MBS spectra provide parameters that are useful for understanding topological superconductivity in this system.
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.|State Key Laboratory of High Performance Computing, National University of Defense Technology, 410073, Changsha, P. R. China.
authors.forename: M T
authors.initials: MT
authors.lastname: Deng
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.|Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Vaitiekėnas
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: E B
authors.initials: EB
authors.lastname: Hansen
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.|Niels Bohr International Academy, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Danon
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.|Division of Solid State Physics and NanoLund, Lund University, Box 118, S-22100, Lund, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Leijnse
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: K
authors.initials: K
authors.lastname: Flensberg
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Nygård
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
authors.forename: P
authors.initials: P
authors.lastname: Krogstrup
authors.affiliation: Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark. marcus@nbi.dk.
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus