Finite-bias cooper pair splitting

L. Hofstetter; S. Csonka; A. Baumgatner; G. Fulop; S. d'Hollosy; Jesper Nygård; C. Schoenenberger

doi:10.1103/PhysRevLett.107.136801

Finite-bias cooper pair splitting

L. Hofstetter, S. Csonka, A. Baumgatner, G. Fulop, S. d'Hollosy, Jesper Nygård, C. Schoenenberger

99 Citations (Scopus)

Abstract

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 nonclassical current correlations due to the splitting of Cooper pairs. We experimentally investigate the effect of a finite potential difference across one quantum dot on the conductance through the other completely grounded QD in a Cooper pair splitter fabricated on an InAs nanowire. We demonstrate that the nonlocal electrical transport through the device can be tuned by electrical means and that the energy dependence of the effective density of states in the QDs is relevant for the rates of Cooper pair splitting (CPS) and elastic cotunneling. Such experimental tools are necessary to understand and develop CPS-based sources of entangled electrons in solid-state devices.

Original language	English
Journal	Physical Review Letters
Volume	107
Issue number	13
Pages (from-to)	136801
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.107.136801
Publication status	Published - 19 Sept 2011

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title = "Finite-bias cooper pair splitting",

abstract = "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 nonclassical current correlations due to the splitting of Cooper pairs. We experimentally investigate the effect of a finite potential difference across one quantum dot on the conductance through the other completely grounded QD in a Cooper pair splitter fabricated on an InAs nanowire. We demonstrate that the nonlocal electrical transport through the device can be tuned by electrical means and that the energy dependence of the effective density of states in the QDs is relevant for the rates of Cooper pair splitting (CPS) and elastic cotunneling. Such experimental tools are necessary to understand and develop CPS-based sources of entangled electrons in solid-state devices.",

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T1 - Finite-bias cooper pair splitting

AU - Hofstetter, L.

AU - Csonka, S.

AU - Baumgatner, A.

AU - Fulop, G.

AU - d'Hollosy, S.

AU - Nygård, Jesper

AU - Schoenenberger, C.

PY - 2011/9/19

Y1 - 2011/9/19

N2 - 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 nonclassical current correlations due to the splitting of Cooper pairs. We experimentally investigate the effect of a finite potential difference across one quantum dot on the conductance through the other completely grounded QD in a Cooper pair splitter fabricated on an InAs nanowire. We demonstrate that the nonlocal electrical transport through the device can be tuned by electrical means and that the energy dependence of the effective density of states in the QDs is relevant for the rates of Cooper pair splitting (CPS) and elastic cotunneling. Such experimental tools are necessary to understand and develop CPS-based sources of entangled electrons in solid-state devices.

AB - 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 nonclassical current correlations due to the splitting of Cooper pairs. We experimentally investigate the effect of a finite potential difference across one quantum dot on the conductance through the other completely grounded QD in a Cooper pair splitter fabricated on an InAs nanowire. We demonstrate that the nonlocal electrical transport through the device can be tuned by electrical means and that the energy dependence of the effective density of states in the QDs is relevant for the rates of Cooper pair splitting (CPS) and elastic cotunneling. Such experimental tools are necessary to understand and develop CPS-based sources of entangled electrons in solid-state devices.

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DO - 10.1103/PhysRevLett.107.136801

M3 - Journal article

C2 - 22026885

SN - 0031-9007

VL - 107

SP - 136801

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

ER -

Finite-bias cooper pair splitting

Abstract

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