Crossed Andreev Reflection and Charge Imbalance in Diffusive Normal-Superconducting-Normal Structures

Golubev, Dmitri S.; Kalenkov, Mikhail S.; Zaikin, Andrei D.

doi:10.1103/physrevlett.103.067006

Cited by 45 publications

(76 citation statements)

References 32 publications

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“…We believe that the remaining discrepancy may be attributed to the influence of high Ohmic graphene ribbons, the presence of which can lead to disorder-enhanced crossed Andreev reflection [22]. The point is that Eqs.…”

Section: Fig 2 (Color Onlinementioning

confidence: 98%

“…The theory of Ref. [22] predicts that, in this configuration, g 12 may increase strongly due to disorder enhanced Andreev scattering.…”

Section: Fig 2 (Color Onlinementioning

confidence: 99%

“…In the case of two pointlike junctions attached to a disordered 2D superconducting film with the sheet resistance R □ , these contributions read [20,22] …”

Section: Fig 2 (Color Onlinementioning

confidence: 99%

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Cooper Pair Splitting by Means of Graphene Quantum Dots

et al. 2015

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Split Cooper pair is a natural source for entangled electrons which is a basic ingredient for quantum information in solid state. We report an experiment on a superconductor-graphene double quantum dot (QD) system, in which we observe Cooper pair splitting (CPS) up to a CPS efficiency of ∼ 10%. With bias on both QDs, we are able to detect a positive conductance correlation across the two distinctly decoupled QDs. Furthermore, with bias only on one QD, CPS and elastic co-tunneling can be distinguished by tuning the energy levels of the QDs to be asymmetric or symmetric with respect to the Fermi level in the superconductor.

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Section: Fig 2 (Color Onlinementioning

confidence: 98%

“…The theory of Ref. [22] predicts that, in this configuration, g 12 may increase strongly due to disorder enhanced Andreev scattering.…”

Section: Fig 2 (Color Onlinementioning

confidence: 99%

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Cooper Pair Splitting by Means of Graphene Quantum Dots

et al. 2015

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“…The latter experiment also showed dominance of CAR processes at low voltages for samples with higher interface transparency. These experimental results have lead to several theoretical works 9,10,11,12,13,14,15,16 , which attempt to find a microscopic description for those observations. However, up to now theories based on noninteracting models could not explain the change of sign of the non-local conductance 10,11,12,13 .…”

Section: Introductionmentioning

confidence: 98%

Nonlocal transport through multiterminal diffusive superconducting nanostructures

Bergeret

Yeyati

2009

Phys. Rev. B

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Motivated by recent experiments on nonlocal transport through multiterminal superconducting hybrid structures, we present self-consistent calculations based on quasiclassical Green's functions for the order parameter, currents and voltages in a system consisting of a diffusive superconductor connected to two normal and one superconducting electrodes. We investigate non-equilibrium effects for different biasing conditions corresponding to measurements of the nonlocal conductance and of the nonlocal resistance. It is shown that while the nonlocal conductance does not change its sign, this change might be observed in a nonlocal resistance measurement for certain parameter range. The change of sign of the nonlocal signal takes places at a voltage of the order of the self-consistent gap of the superconducting region. We show that this is not related to the nonlocal Andreev processes but rather to non-equilibrium effects. We finally discuss the case of four terminal measurements and demonstrate that a change of sign in the nonlocal resistance appears when the current injected into the superconductor exceeds a critical value. The connection to the existing experiments is discussed.

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“…Theoretical papers report that ET typically dominates CAR in linear response [3,9]. CAR can dominate ET beyond linear response or in the presence of interactions [8,10,12,13].…”

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confidence: 99%

Focused crossed Andreev reflection

Haugen

Brataas

Waintal

et al. 2011

EPL

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We consider non-local transport in a system with one superconducting and two normal metal terminals. Electron focusing by weak perpendicular magnetic fields is shown to tune the ratio between crossed Andreev reflection (CAR) and electron transfer (ET) in the non-local current response. Additionally, electron focusing facilitates non-local signals between normal metal contacts where the separation is as large as the mean free path rather than being limited by the coherence length of the superconductor. CAR and ET can be selectively enhanced by modulating the magnetic field.

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Crossed Andreev Reflection and Charge Imbalance in Diffusive Normal-Superconducting-Normal Structures

Cited by 45 publications

References 32 publications

Cooper Pair Splitting by Means of Graphene Quantum Dots

Cooper Pair Splitting by Means of Graphene Quantum Dots

Nonlocal transport through multiterminal diffusive superconducting nanostructures

Focused crossed Andreev reflection

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