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Título

Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures

Autor Lee, Eduardo J. H.; Jiang, Xiaocheng; Houzet, Manuel; Aguado, Ramón ; Lieber, Charles M.; Franceschi, Silvano de
Fecha de publicación 2014
EditorNature Publishing Group
Citación Nature Nanotechnology 9(1): 79-84 (2014)
ResumenThe physics and operating principles of hybrid superconductor-semiconductor devices rest ultimately on the magnetic properties of their elementary subgap excitations, usually called Andreev levels. Here we report a direct measurement of the Zeeman effect on the Andreev levels of a semiconductor quantum dot with large electron g-factor, strongly coupled to a conventional superconductor with a large critical magnetic field. This material combination allows spin degeneracy to be lifted without destroying superconductivity. We show that a spin-split Andreev level crossing the Fermi energy results in a quantum phase transition to a spin-polarized state, which implies a change in the fermionic parity of the system. This crossing manifests itself as a zero-bias conductance anomaly at finite magnetic field with properties that resemble those expected for Majorana modes in a topological superconductor. Although this resemblance is understood without evoking topological superconductivity, the observed parity transitions could be regarded as precursors of Majorana modes in the long-wire limit. © 2014 Macmillan Publishers Limited.
Descripción El pdf del artículo es la versión pre-print: arXiv:1302.2611
Versión del editorhttp://dx.doi.org/10.1038/nnano.2013.267
URI http://hdl.handle.net/10261/95510
DOI10.1038/nnano.2013.267
Identificadoresdoi: 10.1038/nnano.2013.267
issn: 1748-3387
e-issn: 1748-3395
Aparece en las colecciones: (ICMM) Artículos
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