Noise in Mesoscopic Systems

In the foreground of contemporary physics, the role of chaos and order concomitantly present in physical systems is experimentally and theoretically well-grounded. The ubiquity of chaos and order in systems that include atomic nuclei and artificial atoms, among others, imposes the central question about the conceptual common element to all of them. Professor Mahir Saleh Hussein contributed to all these scenarios, investigating them predominantly in the light of the random matrix theory (RMT). All of these systems can support the universality of fundamental symmetries described by RMT and, therefore, mesoscopic systems composed of atomic confined aggregates can emulate scattering phenomena on smaller scales such as those of atomic nuclei. Mesoscopic systems can be controlled and create confinement phenomena that encompass the fundamental Wigner-Dyson symmetries as well as all others categorized by Cartan. In particular, among other results, the studies with Professor Mahir Saleh Hussein, presented in this investigation, demonstrated that the shot noise power can categorize not only the Wigner-Dyson classes, through the accumulation of spin in electronic reservoirs, but also the chiral classes, through scattering in graphene nanostructures.