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• W3153933732 abstract "The states of two electrons in tunnel-coupled semiconductor quantum dots can be effectively described in terms of a two-spin Hamiltonian with an isotropic Heisenberg interaction. A similar description needs to be generalized in the case of holes due to their multiband character and spin-orbit coupling, which mixes orbital and spin degrees of freedom, and splits $J=3/2$ and $J = 1/2$ multiplets. Here we investigate two-hole states in prototypical coupled Si and Ge quantum dots via different theoretical approaches. Multiband $boldsymbol{k}cdotboldsymbol{p}$ and Configuration-Interaction calculations are combined with entanglement measures in order to thoroughly characterize the two-hole states in terms of band mixing and justify the introduction of an effective spin representation, which we analytically derive a from generalized Hubbard model. We find that, in the weak interdot regime, the ground state and first excited multiplet of the two-hole system display -- unlike their electronic counterparts -- a high degree of $J$-mixing, even in the limit of purely heavy-hole states. The light-hole component additionally induces $M$-mixing and a weak coupling between spinors characterized by different permutational symmetries." @default.
• W3153933732 created "2021-04-26" @default.
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• W3153933732 date "2021-07-12" @default.
• W3153933732 modified "2023-10-16" @default.
• W3153933732 title "Interacting holes in Si and Ge double quantum dots: From a multiband approach to an effective-spin picture" @default.
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• W3153933732 doi "https://doi.org/10.1103/physrevb.104.035302" @default.
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