Nonadiabatic quantum control of valley states in silicon

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dc.contributor.authorGardin, A.
dc.contributor.authorMonaghan, R.D.
dc.contributor.authorWhittaker, T.
dc.contributor.authorRahman, R.
dc.contributor.authorTettamanzi, G.C.
dc.date.issued2022
dc.descriptionPublished 7 February 2022
dc.description.abstractNonadiabatic quantum effects, often experimentally observed in semiconductor nanodevices such as singleelectron pumps operating at high frequencies, can result in undesirable and uncontrollable behavior. However, when combined with the valley degree of freedom inherent to silicon, these unfavourable effects may be leveraged for quantum information processing schemes. By using an explicit time evolution of the Schrödinger equation, we study numerically nonadiabatic transitions between the two lowest valley states of an electron in a quantum dot formed in a SiGe/Si heterostructure. The presence of a single-atomic layer step at the top SiGe/Si interface opens an anticrossing in the electronic spectrum as the center of the quantum dot is varied. We show that an electric field applied perpendicularly to the interface allows tuning of the anticrossing energy gap. As a result, by moving the electron through this anticrossing, and by electrically varying the energy gap, it is possible to electrically control the probabilities of the two lowest valley states.
dc.description.statementofresponsibilityAlan Gardin, Ross D. Monaghan, Tyler Whittaker, Rajib Rahman, and Giuseppe C. Tettamanzi
dc.identifier.citationPhysical Review B (condensed matter and materials physics), 2022; 105(7):075406-1-075406-13
dc.identifier.doi10.1103/physrevb.105.075406
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.orcidGardin, A. [0000-0002-9825-9963]
dc.identifier.orcidMonaghan, R.D. [0000-0001-7666-1380]
dc.identifier.orcidWhittaker, T. [0000-0003-0890-2116]
dc.identifier.orcidTettamanzi, G.C. [0000-0002-3209-0632]
dc.identifier.urihttps://hdl.handle.net/2440/134803
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.rights©2022 American Physical Society
dc.source.urihttps://doi.org/10.1103/physrevb.105.075406
dc.titleNonadiabatic quantum control of valley states in silicon
dc.typeJournal article
pubs.publication-statusPublished

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