High-frequency nonlinear oscillations and intrinsic chaos in short GaAs/(Al,Ga)As superlattices
Speaker:
Bjorn Birnir, University of California Santa Barbara
Date and Time:
Monday, April 9, 2018 - 3:30pm to 4:30pm
Location:
Fields Institute, Room 230
Abstract:
We explore the design parameter space of short (5–25 period), n-doped, Ga/(Al,Ga)As semiconductor superlattices (SSLs) in the sequential resonant tun- neling regime. We consider SSLs at cool (77K) and warm (295K) temperatures, simulating the electronic response to variations in (a) the number of SSL periods, (b) the contact conductivity, and (c) the strength of disorder (aperiodicities). Our analysis shows that the chaotic dynamical phases exist on a number of sub-manifolds of codimension zero within the design parameter space. This result provides an en- couraging guide towards the experimental observation of high-frequency intrinsic dynamical chaos in shorter SSLs.