Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session F46: Focus Session: Shuttling and Readout in Spin Qubit Arrays
8:00 AM–10:48 AM,
Tuesday, March 5, 2024
Room: 200AB
Sponsoring
Units:
DQI DCMP
Chair: Yujun Choi, Virginia Tech
Abstract: F46.00002 : Valley-splitting mapping by conveyor-mode spin-coherent single electron shuttling*
8:12 AM–8:24 AM
Presenter:
Mats Volmer
(Research Center Jülich)
Authors:
Mats Volmer
(Research Center Jülich)
Tom Struck
(RWTH Aachen University)
Lino Visser
(Research Center Jülich)
Arnau Sala
(Research Center Jülich)
Max Oberländer
(RWTH Aachen University)
Bingjie Chen
(RWTH Aachen University)
Tobias Offermann
(RWTH Aachen University)
Ran Xue
(RWTH Aachen University)
Jhih-Sian Tu
(Research Center Jülich)
Stefan Trellenkamp
(Research Center Jülich)
Lukasz Cywinski
(Polish Academy of Sciences, Warsaw)
Hendrik Bluhm
(RWTH Aachen University)
Lars R Schreiber
(JARA-FIT Institute for Quantum Information, RWTH Aachen Univ)
Leveraging the spatial control granted by conveyor-mode spin-coherent electron shuttling [1], we map valley splittings at various positions in the shuttling path by detecting magnetic anticrossings of ground and excited valley states. Our new method has sub μeV energy accuracy and a lateral resolution limited by quantum dot size and potential disorder. In addition to shuttling, we orthogonally displace the shuttle path by 6 nm steps in order to gain a 2D valley splitting map of 210 nm by 18 nm size. Its correlation length is given by the dot size and its energy spectrum agrees well with magneto-spectroscopy data for the same wafer, which, however, requires approximately 100 times longer measurement time.
*Funded by the German Research Foundation under EXC 2004/1 – 390534769.
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