From Cooper pair splitting to nonlocal spectroscopy of a Shiba state
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From Cooper pair splitting to nonlocal spectroscopy of a Shiba state. / Scherubl, Zoltan; Fulop, Gergo; Gramich, Jorg; Palyi, Andras; Schonenberger, Christian; Nygard, Jesper; Csonka, Szabolcs.
I: Physical Review Research, Bind 4, Nr. 2, 023143, 24.05.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - From Cooper pair splitting to nonlocal spectroscopy of a Shiba state
AU - Scherubl, Zoltan
AU - Fulop, Gergo
AU - Gramich, Jorg
AU - Palyi, Andras
AU - Schonenberger, Christian
AU - Nygard, Jesper
AU - Csonka, Szabolcs
PY - 2022/5/24
Y1 - 2022/5/24
N2 - Cooper pair splitting (CPS) is a way to create spatially separated, entangled electron pairs. To this day, CPS is often identified in experiments as a spatial current correlation. However, such correlations can arise even in the absence of CPS, when a quantum dot is strongly coupled to the superconductor, and a subgap Shiba state is formed. Here, we present a detailed experimental characterization of those spatial current correlations, as the tunnel barrier strength between the quantum dot and the neighboring normal electrode is tuned. The correlation of the nonlocal signal and the barrier strength reveals a competition between CPS and the nonlocal probing of the Shiba state. We describe our experiment with a simple transport model and obtain the tunnel couplings of our device by fitting the model's prediction to the measured conductance correlation curve. Furthermore, we use our theory to extract the contribution of CPS to the nonlocal signal.
AB - Cooper pair splitting (CPS) is a way to create spatially separated, entangled electron pairs. To this day, CPS is often identified in experiments as a spatial current correlation. However, such correlations can arise even in the absence of CPS, when a quantum dot is strongly coupled to the superconductor, and a subgap Shiba state is formed. Here, we present a detailed experimental characterization of those spatial current correlations, as the tunnel barrier strength between the quantum dot and the neighboring normal electrode is tuned. The correlation of the nonlocal signal and the barrier strength reveals a competition between CPS and the nonlocal probing of the Shiba state. We describe our experiment with a simple transport model and obtain the tunnel couplings of our device by fitting the model's prediction to the measured conductance correlation curve. Furthermore, we use our theory to extract the contribution of CPS to the nonlocal signal.
KW - ANDREEV BOUND-STATES
KW - TRANSPORT
KW - ENTANGLEMENT
KW - GROWTH
KW - DOT
U2 - 10.1103/PhysRevResearch.4.023143
DO - 10.1103/PhysRevResearch.4.023143
M3 - Journal article
VL - 4
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 2
M1 - 023143
ER -
ID: 311908989