Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G42: Topological Superconductivity in Nanowires and One-dimensional Systems
11:30 AM–2:06 PM,
Tuesday, March 7, 2023
Room: Room 318
Sponsoring
Unit:
DMP
Chair: Mitra Sedeeqi, Binghamton University
Abstract: G42.00010 : Building a minimal Kitaev chain using proximitized quantum dots at the charge-neutral sweet spot*
1:42 PM–1:54 PM
Presenter:
Guanzhong Wang
(Delft University of Technology)
Authors:
Guanzhong Wang
(Delft University of Technology)
David van Driel
(Delft University of Technology)
Di Xu
(Delft University of Technology)
Francesco Zatelli
(Delft University of Technology)
Tom Dvir
(Delft University of Technology)
Alberto Bordin
(Delft University of Technology)
Greg Mazur
(Delft University of Technology)
Nick van Loo
(Delft University of Technology)
Bart Roovers
(Delft University of Technology)
Sasa Gazibegovic
(Eindhoven University of Technology)
Ghada Badawy
(Eindhoven University of Technology)
Erik P. A. M. Bakkers
(Eindhoven University of Technology)
Leo P Kouwenhoven
(Delft University of Technology)
A Poor Man’s Majorana platform can generate two isolated Majorana zero modes at a parameter sweet spot by controllably coupling two ordinary fermions. Starting from electrons in quantum dots that have charge –e and spin ½, tunnel coupling mixes them to produce chargeless, spinless Majorana zero modes. In comparison, an Andreev bound state can also have zero charge at a critical coupling rate to a superconductor, although its spin remains ½. Following the general recipe for obtaining Poor Man’s Majorana zero modes, we couple two such chargless Andreev bound states in two proximitized quantum dots and study the system under a two-fold sweet spot. The inter-dot coupling sweet spot eliminates both charge and spin, while the intra-dot superconducting coupling further removes any dependence of local charge on the electrostatic environment. We discuss the practical implications on this system’s immunity to noise and perturbations.
*We acknowledge Microsoft and the Dutch Organization for Scientific Research (NWO) for funding support.
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