LCHO-CI method for the voltage control of exchange interaction in gated lateral quantum dot networks

Details LCHO-CI method for the voltage control of exchange interaction in gated lateral quantum dot networks LCHO-CI method for the voltage control of exchange interaction in gated lateral quantum dot networks

2007-06-06

arxiv.org/abs/0706.0905v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

23 pages, 7 figures, submitted to Phys. Rev. B

Scientific paper

We present a computational LCHO-CI approach allowing for the simulation of exchange interactions in gated lateral quantum dot networks. The approach is based on single-particle states calculated using a linear combination of harmonic orbitals (LCHO) of each of the dots, and a configuration interaction (CI) approach to the interacting electron problem. The LCHO-CI method is applied to a network of three quantum dots with one electron spin per dot, and a Heisenberg spin Hamiltonian is derived. The manipulation of spin states of a three-spin molecule by applying bias to one of the dots is demonstrated and related to the bias dependence of effective exchange interaction parameters.

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