Dynamic instabilities in resonant tunneling induced by a magnetic field

TL;DR

This paper demonstrates that applying a magnetic field to an asymmetric double barrier structure causes self-sustained current oscillations due to nonlinear coupling, with potential transition to chaotic behavior at higher fields.

Contribution

It reveals how magnetic fields induce dynamic instabilities and chaos in resonant tunneling structures, a novel insight into their nonlinear behavior.

Findings

Magnetic field induces self-sustained current oscillations.

System bifurcates and transitions to chaos with increasing field.

External magnetic field affects local density of states.

Abstract

We show that the addition of a magnetic field parallel to the current induces self sustained intrinsic current oscillations in an asymmetric double barrier structure. The oscillations are attributed to the nonlinear dynamic coupling of the current to the charge trapped in the well, and the effect of the external field over the local density of states across the system. Our results show that the system bifurcates as the field is increased, and may transit to chaos at large enough fields.