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In this work, it is considered a nanostructure composed by a quantum dot coupled to two ferromagnets and a superconductor. The transport properties of this system are studied within a generalized mean-field approximation taking into account…

介观与纳米尺度物理 · 物理学 2014-09-19 E. C. Siqueira , P. A. Orellana , A. C. Seridonio , R. C. Cestari , M. S. Figueira , G. G. Cabrera

In a device with a superconductor coupled to two parallel quantum dots (QDs) the electrical tunability of the QD levels can be used to exploit non-classical current correlations due to the splitting of Cooper pairs. We experimentally…

介观与纳米尺度物理 · 物理学 2011-09-20 L. Hofstetter , S. Csonka , A. Baumgartner , Fülöp , S. d'Hollosy , J. Nygård , C. Schönenberger

We study the electric and thermoelectric transport properties of correlated quantum dots coupled to two ferromagnetic leads and one superconducting electrode. Transport through such hybrid devices depends on the interplay of…

介观与纳米尺度物理 · 物理学 2015-06-19 Krzysztof P. Wojcik , Ireneusz Weymann

A Cooper pair splitter consists of two quantum dots side-coupled to a conventional superconductor. Usually, the quantum dots are assumed to have a large charging energy compared to the superconducting gap, in order to suppress processes…

介观与纳米尺度物理 · 物理学 2016-04-07 Ehud Amitai , Rakesh P. Tiwari , Stefan Walter , Thomas L. Schmidt , Simon E. Nigg

We simulated the radiative response of the cavity quantum electrodynamics (QED) coupled to the double quantum dot Cooper pair splitter and analyzed its spectral dependence to get insight into dynamics of the Cooper pair transfers. The model…

介观与纳米尺度物理 · 物理学 2022-09-05 Bogdan R. Bułka

We describe a Josephson device composed of two superconductors separated by two interacting quantum dots in parallel, as a probe for Cooper pair splitting. In addition to sequential tunneling of electrons through each dot, an additional…

介观与纳米尺度物理 · 物理学 2016-01-20 R. Jacquet , J. Rech , T. Jonckheere , A. Zazunov , T. Martin

We investigate the nonlocal thermoelectric transport in a Cooper-pair splitter based on a double-quantum-dot-superconductor three-terminal hybrid structure. We find that the nonlocal coupling between the superconductor and the quantum dots…

介观与纳米尺度物理 · 物理学 2019-02-20 Robert Hussein , Michele Governale , Sigmund Kohler , Wolfgang Belzig , Francesco Giazotto , Alessandro Braggio

The effect of an ac electric field on quantum transport properties in a system of three quantum dots, two of which are connected in parallel while the third is coupled to one of the other two, is investigated theoretically. Based on the…

介观与纳米尺度物理 · 物理学 2015-06-18 Han-Zhao Tang , Xing-Tao An , Ai-Kun Wang , Jian-Jun Liu

We study the effect of an external magnetic field in the Kondo regime of a double-quantum-dot system in which a strongly correlated dot (the "hanging dot") is coupled to a second, noninteracting dot that also bridges the gap between two…

介观与纳米尺度物理 · 物理学 2013-06-13 Luis G. G. V. Dias da Silva , Edson Vernek , Kevin Ingersent , Nancy P. Sandler , Sergio E. Ulloa

We propose an approach allowing the computation of currents and their correlations in interacting multiterminal mesoscopic systems involving quantum dots coupled to normal and/or superconducting leads. The formalism relies on the expression…

介观与纳米尺度物理 · 物理学 2012-01-18 J. Rech , D. Chevallier , T. Jonckheere , T. Martin

The Andreev transport properties of double quantum dot based Cooper pair splitters with one superconducting and two normal leads are studied theoretically in the Kondo regime. The influence of the superconducting pairing correlations on the…

介观与纳米尺度物理 · 物理学 2017-11-22 K. Wrzesniewski , I. Weymann

Recent experiments have observed Cooper pair splitting in quantum dots coupled to superconductors, and efficient schemes for controlling and timing the splitting process are now called for. Here, we propose and analyze an adiabatic Cooper…

介观与纳米尺度物理 · 物理学 2024-02-09 Fredrik Brange , Riya Baruah , Christian Flindt

We analyze microscopically a Cooper pair splitting device in which a central superconducting lead is connected to two weakly coupled normal leads through a carbon nanotube. We determine the splitting efficiency at resonance in terms of…

介观与纳米尺度物理 · 物理学 2015-05-27 P. Burset , W. J. Herrera , A. Levy Yeyati

We investigate a hybrid device consisting of two quantum dots placed between a BCS superconductor and a semiconductor with a strong spin-orbit interaction. Assuming charge tunneling between quantum dots through spin-flip processes, we study…

介观与纳米尺度物理 · 物理学 2026-01-22 Bogdan R. Bułka , Tadeusz Domański , Karol I. Wysokiński

The existence of spin-triplet superconductivity in non-collinear magnetic heterostructures with superconductors is by now well established. This observation lays the foundation of superconducting spintronics with the aim to create a…

超导电性 · 物理学 2019-04-05 I. V. Bobkova , A. M. Bobkov , Wolfgang Belzig

One of the most promising approaches of generating spin- and energy-entangled electron pairs is splitting a Cooper pair into the metal through spatially separated terminals. Utilizing hybrid systems with the energy-dependent barriers at the…

介观与纳米尺度物理 · 物理学 2015-10-12 I. A. Sadovskyy , G. B. Lesovik , V. M. Vinokur

The conductance through a mesoscopic system of interacting electrons coupled to two adjacent leads is conventionally derived via the Keldysh nonequilibrium Green's function technique, in the limit of noninteracting leads [see Y. Meir…

强关联电子 · 物理学 2012-08-16 Yuan Li , Mansoor B. A. Jalil , Seng Ghee Tan

A detailed investigation of the non-equilibrium steady-state electric and thermoelectric transport properties of a quantum dot coupled to the normal metallic and s-wave superconducting reservoirs (N-QD-S) are provided within the Coulomb…

介观与纳米尺度物理 · 物理学 2022-02-22 Sachin Verma , Ajay

Thermoelectric effect is exploited to optimize the Cooper pair splitting efficiency in a Y-shaped junction, which consists of two normal leads coupled to an $s$-wave superconductor via double noninteracting quantum dots. Here, utilizing…

介观与纳米尺度物理 · 物理学 2015-11-25 Zhan Cao , Tie-Feng Fang , Lin Li , Hong-Gang Luo

This letter is devoted to the optimization of the Cooper pair splitting efficiency in a Y-shaped junction. The latter consists of two quantum dots, one superconducting and two normal leads. We tailor the bias in the two normal leads such…

介观与纳米尺度物理 · 物理学 2014-05-13 K. J. Pototzky , E. K. U. Gross