Abstract
We have analyzed theoretically quenched dynamics of correlated double quantum dot (DQD) due to the switching “on” and “off” coupling to reservoirs. The possibility for controllable manipulation of charge and spin states in the double quantum dot was revealed and discussed. The proposed experimental scheme allows to prepare in DQD maximally entangled pure triplet state and to drive it to another entangled singlet state by tuning both applied bias and gate voltage. It was also demonstrated that the symmetry properties of the total system (double quantum dot coupled to electron reservoirs) allow to resolve the initially prepared two-electron states by detecting non-stationary spin-polarized currents flowing in both reservoirs and controlling the residual charge.
Highlights
The potential of quantum information processing and quantum computation results in numerous proposals of specific material systems for creation and manipulation under spin and charged states in solids[1,2]
We would like to analyzed the situation when reservoir I is symmetrically coupled to the double quantum dot and the reservoir II is interacting only with the dot 2
Results, obtained in the previous section open a possibility to propose the scheme for the controllable spin and charge manipulation in the correlated double quantum dot (DQD) by means of applied bias voltage and gate voltage changing
Summary
We consider correlated lateral double quantum dot (DQD) coupled to the electron reservoirs (leads) by tunnel barriers (see Fig. 1). Www.nature.com/scientificreports interaction with the reservoirs, one could use the basis of exact eigenfunctions and eigenvalues of coupled QDs without interaction with the leads In this case all energies of single- and multi-electron states are well known. Two single electron states basis functions |0↑〉|00〉 and |00〉|0↑〉 correspond to the presence of a single electron with a given spin in each quantum dot. Where coefficients αj, βj, γj, δj are the eigenvectors of the Hamiltonian (1) matrix in the introduced basis for the opposite spin two electron states. These are low energy singlet S0 and triplet T0 states and excited singlet (S0*) and triplet states (T0*). In the case of symmetric coupling between QDs system and the reservoir (lead) I kinetic coefficients are λ
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