Fyzikální ústav Akademie věd ČR

Seminář Čtvrtek, 22.10.2015 15:00 - 16:00

Přednášející: Mads Brandbyge (Department of micro and nanotechnology & Center for Nanostructured Graphene (CNG), Technical University of Denmark (DTU), Denmark)
Místo: Cukrovarnická 10, budova A, knihovna, 1. patro
Jazyk: anglicky
Pořadatelé: Oddělení tenkých vrstev a nanostruktur

In the Landauer approach to nanoscale transport the electrons are assumed to bypass a conducting junction ballistically and equilibrate through energy exchange in the electrodes. However, when passing through the junction, the current-carrying electrons has a finite, albeit small, probability to interact with the atomic vibrations (phonons) in the junction leading to local energy and momentum transfer.In the presence of a high current density this will not only lead to Joule heating: Recently a number of other mechanisms have been pointed out in which the current may excite and influence the atomic motion in nano-junctions, and possibly lead to instabilities and contact disruption. I will motivate our research and present computer simulations of the effects in atomic, molecular, and graphene-based junctions using first principles methods.

Přílohy:

brandbyge_22102015.pdf