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• W3181947999 abstract "The presence of degenerate conduction band valleys and how they are mixed by interfaces play critical roles in determining electron interaction and spectrum in a silicon nanostructure. Here we investigate how the valley phases affect the exchange interaction in a symmetric two-electron silicon double quantum dot. Through a configuration interaction calculation, we find that exchange splitting is suppressed at a finite value of valley phase difference between the two dots, and reaches its minimum value ({sim} 0) when the phase difference is {pi}. Such a suppression can be explained using the Hubbard model, through the valley-phase-dependent dressing by the doubly occupied states on the ground singlet and triplet states. The contributions of the higher orbital states also play a vital role in determining the value of the exchange energy in general, which is a crucial parameter for applications such as exchange gates for spin qubits." @default.
• W3181947999 created "2021-07-19" @default.
• W3181947999 creator A5011108867 @default.
• W3181947999 creator A5016471128 @default.
• W3181947999 date "2021-07-01" @default.
• W3181947999 modified "2023-10-07" @default.
• W3181947999 title "Impact of the valley orbit coupling on exchange gate for spin qubits in silicon quantum dots" @default.
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• W3181947999 doi "https://doi.org/10.48550/arxiv.2107.00732" @default.
• W3181947999 hasPublicationYear "2021" @default.
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