Kavli Affiliate: Srijit Goswami
| First 5 Authors: Qingzhen Wang, Sebastiaan L. D. ten Haaf, Ivan Kulesh, Di Xiao, Candice Thomas
| Summary:
Cooper pairs occupy the ground state of superconductors and are typically
composed of maximally entangled electrons with opposite spin. In order to study
the spin and entanglement properties of these electrons, one must separate them
spatially via a process known as Cooper pair splitting (CPS). Here we provide
the first demonstration of CPS in a semiconductor two-dimensional electron gas
(2DEG). By coupling two quantum dots to a superconductor-semiconductor hybrid
region we achieve efficient Cooper pair splitting, and clearly distinguish it
from other local and non-local processes. When the spin degeneracy of the dots
is lifted, they can be operated as spin-filters to obtain information about the
spin of the electrons forming the Cooper pair. Not only do we observe a near
perfect splitting of Cooper pairs into opposite-spin electrons (i.e.
conventional singlet pairing), but also into equal-spin electrons, thus
achieving triplet correlations between the quantum dots. Importantly, the
exceptionally large spin-orbit interaction in our 2DEGs results in a strong
triplet component, comparable in amplitude to the singlet pairing. The
demonstration of CPS in a scalable and flexible platform provides a credible
route to study on-chip entanglement and topological superconductivity in the
form of artificial Kitaev chains.
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