Coherent versus sequential electron tunneling in quantum dots

TL;DR

This paper investigates how quantum coherence affects electron tunneling in quantum dots, explaining experimental conductance features using theoretical models that incorporate quantum interactions and statistical fluctuations.

Contribution

It demonstrates that quantum coherent tunneling accounts for observed conductance peak statistics, advancing understanding of quantum effects in nearly closed quantum dots.

Findings

Quantum coherence explains conductance peak-height fluctuations.

Finite decay widths influence tunneling processes.

Theoretical models match experimental observations.

Abstract

Manifestations of quantum coherence in the electronic conductance through nearly closed quantum dots in the Coulomb blockade regime are addressed. We show that quantum coherent tunneling processes explain some puzzling statistical features of the conductance peak-heights observed in recent experiments at low temperatures. We employ the constant interaction model and the random matrix theory to model the quantum dot electronic interactions and its single-particle statistical fluctuations, taking full account of the finite decay width of the quantum dot levels.