منابع مشابه
Correlated charge polarization in a chain of coupled quantum dots
Coherent charge transfer in a linear array of tunnel-coupled quantum dots, electrostatically coupled to external gates, is investigated using the Bethe ansatz for a symmetrically biased Hubbard chain. Charge polarization in this correlated system is shown to proceed via two distinct processes: formation of bound states in the metallic phase, and charge transfer processes corresponding to a supe...
متن کاملCoupled quantum dots as quantum gates
We consider a new quantum gate mechanism based on electron spins in coupled semiconductor quantum dots. Such gates provide a general source of spin entanglement and can be used for quantum computers. We determine the exchange coupling J in the effective Heisenberg model as a function of magnetic (B) and electric fields, and of the inter-dot distance a within the HeitlerLondon approximation of m...
متن کاملQuantum Impurity Physics in Coupled Quantum Dots
Glossary Quantum dot device: nanoscopic electronic device resembling a transistor which incorporates a quantum dot as the central active element; sometimes also called single electron transistor. A quantum dot is an extremely small puddle of electrons which can be considered as an artificial atom since the confinement of electrons leads to quantized energy levels: the electrons form orbitals mu...
متن کاملOptical signatures of coupled quantum dots.
An asymmetric pair of coupled InAs quantum dots is tuned into resonance by applying an electric field so that a single hole forms a coherent molecular wave function. The optical spectrum shows a rich pattern of level anticrossings and crossings that can be understood as a superposition of charge and spin configurations of the two dots. Coulomb interactions shift the molecular resonance of the o...
متن کاملAnticrossings in Förster Coupled Quantum Dots
We consider two coupled generic quantum dots, each modelled by a simple potential which is given by infinite parabolic potential wells in all three (x-, y-, z-) dimensions. This potential profile allows the derivation of an analytical expression for the inter-dot Förster coupling, in the dipole-dipole approximation. We investigate the energy level behaviour of this coupled two-dot system under ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1997
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.56.r4344