Coherent control of population transfer between communicating defects

TL;DR

This paper demonstrates how external time-periodic forcing can precisely control the transfer of particles between defects in a lattice, enabling adjustable transfer times over large scales.

Contribution

It introduces an analytical model linking forcing parameters to energy splitting, enabling systematic control of population transfer in lattice defects.

Findings

Transfer time can be tuned over several orders of magnitude.

Analytical expression relates forcing amplitude to energy splitting.

Numerical simulations confirm coherent control feasibility.

Abstract

Population transfer between two identical, communicating defects in a one-dimensional tight-binding lattice can be systematically controlled by external time-periodic forcing. Employing a force with slowly changing amplitude, the time it takes to transfer a particle from one defect to the other can be altered over several orders of magnitude. An analytical expression is derived which shows how the forcing effectively changes the energy splitting between the defect states, and numerical model calculations illustrate the possibility of coherent control of the transfer.