Two-Impurity Kondo Model: Spin-Orbit Interactions and Entanglement

Details Two-Impurity Kondo Model: Spin-Orbit Interactions and Entanglement Two-Impurity Kondo Model: Spin-Orbit Interactions and Entanglement

2011-08-08

arxiv.org/abs/1108.1817v1

Mod. Phys. Lett. B 25 (2011) 1083

Physics

Condensed Matter

Strongly Correlated Electrons

Proceedings of StatPhys 24 satellite conference in Hanoi; 9 pages, 4 figures

Scientific paper

10.1142/S0217984911026796

Motivated by proposals to employ RKKY-coupled spins as building blocks in a solid-state quantum computer, we analyze how the RKKY interaction in a 2D electron gas is influenced by spin-orbit interactions. Using a two-impurity Kondo model with added Dresselhaus and Rashba spin-orbit interactions we find that spin-rotational invariance of the RKKY interaction - essential for having a well-controllable two-qubit gate - is restored when tuning the Rashba coupling to have the same strength as the Dresselhaus coupling. We also discuss the critical properties of the two-impurity Kondo model in the presence of spin-orbit interactions, and extract the leading correction to the block entanglement scaling due to these interactions.

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