# Nonadiabatic robust excitation transfer assisted by an imaginary gauge field

## TL;DR

This paper proposes a nonadiabatic, robust excitation transfer method in a non-Hermitian chain using an imaginary gauge field with a linearly changing gradient, achieving efficient transfer despite disorder.

## Contribution

It introduces a novel nonadiabatic excitation transfer technique utilizing an imaginary gauge field to cancel nonadiabatic effects in a non-Hermitian system.

## Key findings

- The method enables efficient excitation transfer between edge sites.
- It is highly robust against disorder in hopping rates and site energies.
- Numerical simulations confirm the effectiveness of the approach.

## Abstract

A nonadiabatic and robust method of excitation transfer in a non-Hermitian tight-binding linear chain, assisted by an imaginary gauge field, is theoretically proposed. The gauge field undergoes a linear gradient in time, from a negative to a positive value, which results in an effective transfer of excitation between the two edge sites of the chain. An imaginary (gain and loss) gradient of site energy potentials is introduced to exactly cancel nonadiabatic effects, thus providing an effective shortcut to adiabaticity and pseudo-Hermitian dynamics. Numerical simulations indicate that the non-Hermitian excitation transfer method is very robust against disorder in hopping rates and site energy of the chain.