Full configuration interaction simulations of exchange coupled donors in silicon in an effective mass theory framework
November 1, 2018 @ 3:00 pm
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Multi-qubit quantum logic gates are the final step to demonstrate the the viability of donor spin qubits in silicon for quantum computation applications. Proposed two-qubit gates rely on the electron-electron exchange interaction which is highly sensitive to the relative placements of the donors in the silicon lattice. For two proximal phosphorus donors an inversion of the hierarchy of the valley-orbital split states has been observed, i.e. the crossing of the bonding combination of T2 states below that of the antibonding A1. Here, we use a full configuration interaction method within an established multivalley effective mass theory framework to model the two-electron wavefunction for different donor configurations. Specifically, we investigate the exchange interaction and valley population along different lattice orientations.