Impurities

Objective:

• Experimental probe of donor wave functions needed.
• Characterize wf distortions by electric fields and interfaces.
• Directly & Indirectly probe wfs by measuring hyperfine tensor components.

Approach:

• Donor electron spin & Si-29 nuclear spin – AHF.
• Past expts done for donor ensembles in bulk at zero fields.
• Classification based on symmetries of lattice points and AHF tensor components.
• Use tight binding wfs of donors to investigate feasibility of experimentally probing distorted wfs.

Results/Impact:

• Data analysis for field and interface distortions - perturbations change the shells and classes lattice points belong to.
• Detecting the deformed donor WF at sub-Bohr radius level is possible.
• Proposed ENDOR expts to directly measure the gate induced Stark shift of the donor WF