Normal, superconducting and topological regimes of hybrid double quantum dots
| Autor: | Daniel Sherman, Jesper Nygård, Charles Marcus, S. M. Albrecht, Peter Krogstrup, Jeremy S. Yodh |
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| Rok vydání: | 2016 |
| Předmět: |
Biomedical Engineering
Nanowire Bioengineering 02 engineering and technology Topology 01 natural sciences Condensed Matter::Materials Science Condensed Matter::Superconductivity 0103 physical sciences General Materials Science Electrical and Electronic Engineering 010306 general physics Superconductivity Coupling Physics Mesoscopic physics Condensed matter physics business.industry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Magnetic field MAJORANA Semiconductor 0210 nano-technology business Ground state |
| Zdroj: | Nature Nanotechnology. 12:212-217 |
| ISSN: | 1748-3395 1748-3387 |
| DOI: | 10.1038/nnano.2016.227 |
| Popis: | Epitaxial semiconductor-superconductor hybrid materials are an excellent basis for studying mesoscopic and topological superconductivity, as the semiconductor inherits a hard superconducting gap while retaining tunable carrier density. Here, we investigate double-quantum-dot structures made from InAs nanowires with a patterned epitaxial Al two-facet shell that proximitizes two gate-defined segments along the nanowire. We follow the evolution of mesoscopic superconductivity and charging energy in this system as a function of magnetic field and voltage-tuned barriers. Interdot coupling is varied from strong to weak using side gates, and the ground state is varied between normal, superconducting and topological regimes by applying a magnetic field. We identify the topological transition by tracking the spacing between successive co-tunnelling peaks as a function of axial magnetic field and show that the individual dots host weakly hybridized Majorana modes. |
| Databáze: | OpenAIRE |
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