Linear and nonlinear Stark effect in triangular molecule

Abstract

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.

7 pages, 5 figures

References in corpus (12)

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• Frustration and entanglement in the $t_{2g}$ spin--orbital model on a triangular lattice: valence--bond and generalized liquid states
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• Entanglement switching via the Kondo effect in triple quantum dots
• Regular and singular Fermi liquid in triple quantum dots: Coherent transport studies
• Thermal entanglement in a triple quantum dot system
• Entanglement in a three spin system controlled by electric and magnetic field
• Magnetic Kondo regimes in a frustrated half-filled trimer
• Dark states in spin-polarized transport through triple quantum dot molecules
• Multipeak Negative Differential Resistance from Interplay between Nonlinear Stark Effect and Double-Branch Current Flow
• Energy spectra of three electrons in SiGe/Si/SiGe laterally coupled triple quantum dots
• Two-qubit logical operations in three quantum dots system
• Contacts for organic switches with carbon-nanotube leads
• Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots
• Cotunneling signatures of Spin-Electric coupling in frustrated triangular molecular magnets