Wave packet revivals in a graphene quantum dot in a perpendicular magnetic field

TL;DR

This paper investigates the dynamics of wavepackets in graphene quantum dots subjected to magnetic fields, revealing how revival times can indicate valley degeneracy breaking, with implications for quantum control.

Contribution

It provides a theoretical analysis of wavepacket revivals in graphene quantum dots, including the effects of magnetic fields and valley contributions, highlighting observable signatures of valley degeneracy breaking.

Findings

Revival times depend on magnetic field strength.

Valley degeneracy breaking affects revival phenomena.

Wavepacket dynamics reveal valley-specific behaviors.

Abstract

We study the time-evolution of localized wavepackets in graphene quantum dots under a perpendicular magnetic field, focusing on the quasiclassical and revival periodicities, for different values of the magnetic field intensities in a theoretical framework. We have considered contributions of the two inequivalent points in the Brillouin zone. The revival time has been found as an observable that shows the break valley degeneracy.