Abstract
An elementary excitation in an aggregate of coupled particles generates a collective excited state. We show that the dynamics of these excitations can be controlled by applying a transient external potential which modifies the phase of the quantum states of the individual particles. The method is based on an interplay of adiabatic and sudden time scales in the quantum evolution of the many-body states. We show that specific phase transformations can be used to accelerate or decelerate quantum energy transfer and spatially focus delocalized excitations onto different parts of arrays of quantum particles. We consider possible experimental implementations of the proposed technique and study the effect of disorder due to the presence of impurities on its fidelity. We further show that the proposed technique can allow control of energy transfer in completely disordered systems.
Highlights
An elementary excitation in an aggregate of coupled particles generates a collective excited state
The method proposed here is based on shaping such many-body wave packets by a series of sudden perturbations, in analogy with the techniques developed for strong-field alignment and orientation of molecules in the gas phase [22]
We have proposed a general method for controlling the time evolution of quantum energy transfer in ordered 1D and 2D arrays of coupled monomers
Summary
First, an ensemble of N coupled identical monomers possessing two internal states arranged in a one-dimensional (1D) array with translational symmetry. We propose to apply a series of site-dependent perturbations that modify the phases of the quantum states of spatially separated monomers These phase transformations change the dynamics of the time evolution of the collective excitations. One can engineer wave packets probing any part of the dispersion E(k) leading to different group velocity and shape evolution At weak parity-mixing fields considered here, the exciton–exciton interactions insignificantly mix different k states of the individual excitons, contributing weakly to localization These effects are expected to be much smaller than the disorder-induced perturbations, discussed in sections 6 and 7
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