Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C29: Semiconductor Qubits I
3:00 PM–5:48 PM,
Monday, March 15, 2021
Sponsoring
Unit:
DQI
Chair: Tristan Meunier
Abstract: C29.00002 : Theory of valley splitting and valley-induced relaxation of a single silicon spin qubit in the presence of interface disorder
3:12 PM–3:24 PM
Live
Presenter:
Amin Hosseinkhani
(Univ Konstanz)
Authors:
Amin Hosseinkhani
(Univ Konstanz)
Guido Burkard
(Univ Konstanz)
We then extend our analysis by developing a valley-dependent envelope function theory. One crucial set of parameters for understanding the behavior of spin relaxation is the inter-valley and intra-valley dipole matrix elements. Our analysis enables us to calculate the dipole matrix elements as a function of interface roughness, the in-plane orbital splitting, and the electromagnetic field. Interestingly, we find some specific highly disordered interfaces where the valley splitting is suppressed but remains finite whereas the inter-valley dipole matrix elements can vanish. In this case, we find that the spin-valley hotspot also disappears.
[1] arXiv: 2007.00332
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