Non-Markovian Dynamics of Charge Carriers in Quantum Dots

TL;DR

This paper explores the non-Markovian quantum dynamics of charge carriers in multilevel quantum dots, revealing conditions under which Fock-space coherence can be maintained despite tunneling processes.

Contribution

It introduces a non-Markovian formalism to analyze real-time evolution and coherence preservation in quantum dots during resonant tunneling transport.

Findings

Fock-space coherence can be preserved despite tunneling.

Real-time dynamics depend on tunneling asymmetries.

Non-Markovian effects are significant in quantum dot transport.

Abstract

We have investigated the dynamics of bound particles in multilevel current-carrying quantum dots. We look specifically in the regime of resonant tunnelling transport, where several channels are available for transport. Through a non-Markovian formalism under the Born approximation, we investigate the real-time evolution of the confined particles including transport-induced decoherence and relaxation. In the case of a coherent superposition between states with different particle number, we find that a Fock-space coherence may be preserved even in the presence of tunneling into and out of the dot. Real-time results are presented for various asymmetries of tunneling rates into different orbitals.