Open AccessJournal Article
Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover
Hugh Churchill,Valla Fatemi,Kasper Grove-Rasmussen,Mingtang Deng,Philippe Caroff,Hongqi Xu,Charles Marcus +6 more
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TLDR
In this article, transport measurements in superconductor-nanowire devices with a gated constriction forming a quantum point contact are presented, and a crossover in magnetoconductance is observed: magnetic fields above similar to 0.5 T enhance conductance in the low-conductance (tunneling) regime but suppress conductance (multichannel) regime.Abstract:
We present transport measurements in superconductor-nanowire devices with a gated constriction forming a quantum point contact. Zero-bias features in tunneling spectroscopy appear at finite magnetic fields and oscillate in amplitude and split away from zero bias as a function of magnetic field and gate voltage. A crossover in magnetoconductance is observed: Magnetic fields above similar to 0.5 T enhance conductance in the low-conductance (tunneling) regime but suppress conductance in the high-conductance (multichannel) regime. We consider these results in the context of Majorana zero modes as well as alternatives, including the Kondo effect and analogs of 0.7 structure in a disordered nanowire.read more
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Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
Stevan Nadj-Perge,Ilya Drozdov,Jian Li,Hua Chen,Sangjun Jeon,Jungpil Seo,Allan H. MacDonald,B. Andrei Bernevig,Ali Yazdani +8 more
TL;DR: In this article, the edge bound Majorana fermions are predicted to localize at the edge of a topological superconductor, a state of matter that can form when a ferromagnetic system is placed in proximity to a conventional super-conductor with strong spin-orbit interaction.
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Exponential protection of zero modes in Majorana islands
S. M. Albrecht,Andrew Higginbotham,Andrew Higginbotham,Morten Hannibal Madsen,Ferdinand Kuemmeth,Thomas Sand Jespersen,Jesper Nygård,Peter Krogstrup,Charles Marcus +8 more
TL;DR: The results help to explain the trivial-to-topological transition in finite systems and to quantify the scaling of topological protection with end-mode separation.
Journal ArticleDOI
Majorana bound state in a coupled quantum-dot hybrid-nanowire system
Mingtang Deng,Mingtang Deng,S. Vaitiekėnas,S. Vaitiekėnas,E. Hansen,Jeroen Danon,Martin Leijnse,Martin Leijnse,Karsten Flensberg,Jesper Nygård,Peter Krogstrup,Charles Marcus +11 more
TL;DR: This work demonstrates 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 thenanowire as a spectrometer and observed hybridization of the MBS with the end-dot bound state, which is in agreement with a numerical model.
Journal Article
Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
TL;DR: High-resolution spectroscopic imaging techniques show that the onset of superconductivity, which gaps the electronic density of states in the bulk of the Fe chains, is accompanied by the appearance of zero-energy end-states, providing strong evidence for the formation of a topological phase and edge-bound Majorana fermions in atomic chains.
Journal ArticleDOI
Majorana zero modes in superconductor–semiconductor heterostructures
Roman M. Lutchyn,Erik P. A. M. Bakkers,Erik P. A. M. Bakkers,Leo P. Kouwenhoven,Peter Krogstrup,Charles Marcus,Yuval Oreg +6 more
TL;DR: In this article, the authors survey the current status of this rapidly developing field, focusing on proposals for the realization of topological superconductivity in semiconductor-superconductor heterostructures.
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