Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D39: Semiconductor Qubits II
3:00 PM–6:00 PM,
Monday, March 14, 2022
Room: McCormick Place W-196A
Sponsoring
Units:
DQI DCMP
Chair: Mark Gyure, UCLA
Abstract: D39.00003 : Anomalous g-factor in a Si/SiGe heterostructure with oscillatory Ge concentration
3:48 PM–4:00 PM
Presenter:
Emily S Joseph
(University of Wisconsin - Madison)
Authors:
Emily S Joseph
(University of Wisconsin - Madison)
Thomas W McJunkin
(University of Wisconsin - Madison)
Benjamin D Woods
(University of Wisconsin-Madison)
Benjamin Harpt
(University of Wisconsin - Madison)
Yi Feng
(University of Wisconsin-Madison)
Donald E Savage
(University of Wisconsin-Madison)
Max G Lagally
(University of Wisconsin - Madison)
Sue N Coppersmith
(University of New South Wales)
Mark G Friesen
(University of Wisconsin - Madison)
Robert J Joynt
(University of Wisconsin - Madison)
Mark A Eriksson
(University of Wisconsin - Madison)
Six Ge1-x in this range have g-factors very close to 2. This unexpected g-factor is a sign that strong spin-orbit coupling is present in this quantum well, which has been shown to host quantum dots andwith have large valley splitting [1], and which is useful for electrically-driven electron spin resonance. We hypothesize that the high spatial frequency changes in Ge concentration present in this sample lead to contributions to the electronic states from points in the Brillouin zone far from the conduction band minimum –regions that play very little role in the physics of conventional, pure-Si quantum wells.
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