Journal article
Valley population of donor states in highly strained silicon
B Voisin, KSH Ng, J Salfi, M Usman, JC Wong, A Tankasala, BC Johnson, JC McCallum, L Hutin, B Bertrand, M Vinet, N Valanoor, MY Simmons, R Rahman, LCL Hollenberg, S Rogge
MATERIALS FOR QUANTUM TECHNOLOGY | IOP Publishing Ltd | Published : 2022
Abstract
Abstract Strain is extensively used to controllably tailor the electronic properties of materials. In the context of indirect band-gap semiconductors such as silicon, strain lifts the valley degeneracy of the six conduction band minima, and by extension the valley states of electrons bound to phosphorus donors. Here, single phosphorus atoms are embedded in an engineered thin layer of silicon strained to 0.8% and their wave function imaged using spatially resolved spectroscopy. A prevalence of the out-of-plane valleys is confirmed from the real-space images, and a combination of theoretical modelling tools is used to assess how this valley repopulation effect can yield isotropi..
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Grants
Awarded by BV, KN, JS, MU, AT, BCJ, JCMC, MYS, RR, LCLH and SR acknowledge support from the ARC Centre of Excellence for Quantum Computation and Communication Technology (CE170100012). JS acknowledges support from an ARC DECRA fellowship (DE160101490). This work was
Awarded by ARC Centre of Excellence for Quantum Computation and Communication Technology
Awarded by ARC DECRA fellowship
Awarded by US Army Research Office
Funding Acknowledgements
BV, KN, JS, MU, AT, BCJ, JCMC, MYS, RR, LCLH and SR acknowledge support from the ARC Centre of Excellence for Quantum Computation and Communication Technology (CE170100012). JS acknowledges support from an ARC DECRA fellowship (DE160101490). This work was in part funded by the US Army Research Office (W911NF-17-1-0202). BCJ and JCMC acknowledge the AFAiiR node of the NCRIS Heavy Ion Capability for access to ion-implantation facilities. CW and NV acknowledge support from ARC Centre of Excellence Future Low Energy Electronics Technologies Grant CE170100039. Computational resources were provided by the National Computing Infrastructure (NCI) and Pawsey Supercomputing Center through National Computational Merit Allocation Scheme (NCMAS) and from the LIEF HPC-GPGPU facility hosted at the University of Melbourne with the assistance of LIEF Grant LE170100200. MYS is a director of the company Silicon Quantum Computing Pty Ltd.