Transient Dynamics of Confined Charges in Quantum Dots in the Sequential Tunnelling Regime

Abstract

We investigate the time-dependent, coherent, and dissipative dynamics of bound particles in single multilevel quantum dots in the presence of sequential tunnelling transport. We focus on the nonequilibrium regime where several channels are available for transport. Through a fully microscopic and non-Markovian density matrix formalism we investigate transport-induced decoherence and relaxation of the system. We validate our methodology by also investigating the Markov limit on our model. We confirm that not only does this limit neglect the coherent oscillations between system states as expected, but also the rate at which the steady state is reached under this limit significantly differs from the non-Markovian results. By a systematic analysis of the decay constants and frequencies of coherent oscillations for the off-diagonal elements of the reduced density matrix under various realistic tunneling rate anisotropies and energy configurations, we outline a criteria for extended decoherence times.

14 pages, 11 figures, 1 table

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Cited by in corpus (11)

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• Delocalization of electrons by cavity photons in transport through a quantum dot molecule
• Electron transport through a quantum dot assisted by cavity photons
• Generalized Master Equation Approach to Time-Dependent Many-Body Transport
• Analytical model of non-Markovian decoherence in donor-based charge quantum bits
• Anomalous magnetotransport through reflection-symmetric artificial molecules
• Resonant Regimes in the Fock-Space Coherence of Multilevel Quantum Dots
• Revealing the internal spin dynamics in a double quantum dot by periodic voltage modulation