English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/174055
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Nonlinear electric and thermoelectric Andreev transport through a hybrid quantum dot coupled to ferromagnetic and superconducting leads

AuthorsHwang, Sun-Yong; Sánchez, David ; López, Rosa
KeywordsMesoscopic and Nanoscale Systems
Issue DateOct-2017
PublisherEDP Sciences
CitationEuropean Physical Journal B 90: 189 (2017)
AbstractWe discuss the nonlinear Andreev current of an interacting quantum dot coupled to spin-polarized and superconducting reservoirs when voltage and temperature biases are applied across the nanostructure. Due to the particle-hole symmetry introduced by the superconducting (S) lead, the subgap spin current vanishes identically. Nevertheless, the Andreev charge current depends on the degree of polarization in the ferromagnetic (F) contact since the shift of electrostatic internal potential of the conductor depends on spin orientation of the charge carrier. This spin-dependent potential shift characterizes nonlinear responses in our device. We show how the subgap current versus the bias voltage or temperature difference depends on the lead polarization in two cases, namely (i) S-dominant case, when the dot-superconductor tunneling rate (Γ R ) is much higher than the ferromagnet-dot tunnel coupling (Γ L ), and (ii) F-dominant case, when Γ L ≫ Γ R . For the ferromagnetic dominant case the spin-dependent potential shows a nonmonotonic behavior as the dot level is detuned. Thus the subgap current can also exhibit interesting behaviors such as current rectification and the maximization of thermocurrents with smaller thermal biases when the lead polarization and the quantum dot level are adjusted.
Publisher version (URL)https://doi.org/10.1140/epjb/e2017-80242-1
Appears in Collections:(IFISC) Artículos
Files in This Item:
File Description SizeFormat 
nonlinear_electric.pdf249,5 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.