Linear and nonlinear Stark effect in triangular molecule

Details Linear and nonlinear Stark effect in triangular molecule Linear and nonlinear Stark effect in triangular molecule

2010-12-29

arxiv.org/abs/1012.5924v2

Phys. Rev. B 83, 035301 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.83.035301

We analyze changes of the electronic structure of a triangular molecule under the influence of an electric field (i.e., the Stark effect). The effects of the field are shown to be anisotropic and include both a linear and a nonlinear part. For strong electron correlations, we explicitly derive exchange couplings in an effective spin Hamiltonian. For some conditions one can find a dark spin state, for which one of the spins is decoupled from the others. The model is also applied for studying electronic transport through a system of three coherently coupled quantum dots. Since electron transfer rates are anisotropic, the current characteristics are anisotropic as well, differing for small and large electric field.

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