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Quasiparticles transport and charge determination in a nanowire Josephson junction | | Yuval Ronen
; Yonatan Cohen
; Jung-Hyun Kang
; Arbel Haim
; Maria-Theresa Rieder
; Moty Heiblum
; Yuval Oreg
; Hadas Shtrikman
; | | Date: |
12 May 2015 | | Abstract: | Non-linear charge transport in Josephson junctions has a unique signature in
the shuttled charge quantum between the two superconductors. In the zero-bias
limit Cooper pairs, each with twice the electron charge, carry the Josephson
current. An applied bias $V_{SD}$ leads to multiple Andreev reflections (MAR),
with charge quanta in integer multiples of the electron charge $ne$. Here $n$
is an integer larger than $2{Delta}/eV_{SD}$ with ${Delta}$ being the
superconducting order parameter, and $e$ the electron charge. Employing
sensitive shot noise measurements in a nanowire (NW) Josephson junction, we use
a modified Fano factor to infer the partitioned charge traversing the junction,
$q=e^*/e$. We demonstrate an excellent quantization of $q$ for
$1{leq}2{Delta}/eV_{SD}{leq}4$; in agreement with the MAR picture.
Concentrating at the transition between $n=1$ and $n=2$, at
$eV_{SD}{approx}2{Delta}$, where one would expect nearly reflectionless
transport of quasiparticles - being a superposition of electrons and holes - we
find dipping of $q$ to ${approx}0.6$. Such lower value of $q$ was not observed
in a similar normal-superconductor NW structure. Our conclusions are also
backed by numerical simulations of transport in these structures. Applying
similar measurements in p-wave Josephson junctions will be useful in
understanding their Majorana bound states excitations. | | Source: | arXiv, 1505.3147 | | Services: | Forum | Review | PDF | Favorites | |
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