Electron trapping in graphene quantum dots with magnetic flux

TL;DR

This paper explores how magnetic flux influences electron trapping in graphene quantum dots, showing that magnetic flux can significantly extend the lifetime of quasi-bound states and improve electron confinement.

Contribution

It demonstrates that magnetic flux can be used to control and extend electron trapping times in graphene quantum dots, revealing new ways to manipulate quantum states in graphene.

Findings

Magnetic flux increases the trapping time of electrons in GQDs.

The probability density within the GQD is enhanced by magnetic flux.

Trapped states persist longer even after flux is turned off.

Abstract

It is known that the appearance of Klein tunneling in graphene makes it hard to keep or localize electrons in a graphene-based quantum dot (GQD). However, a magnetic field can be used to temporarily confine an electron that is traveling into a GQD. The electronic states investigated here are resonances with a finite trapping time, also referred to as quasi-bound states. By subjecting the GDQ to a magnetic flux, we study the scattering phenomenon and the Aharonov-Bohm effect on the lifetime of quasi-bound states existing in a GQD. We demonstrate that the trapping time increases with the magnetic flux sustaining the trapped states for a long time even after the flux is turned off. Furthermore, we discover that the probability density within the GQD is also clearly improved. We demonstrate that the trapping time of an electron inside a GQD can be successfully extended by adjusting the magnetic flux parameters.