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MM: Fachverband Metall- und Materialphysik
MM 27: Transport: Nanomechanics (joint session with MM)
MM 27.5: Vortrag
Dienstag, 17. März 2015, 15:00–15:15, A 053
Large current noise in nanoelectromechanical systems close to continuous mechanical instabilities — Jochen Brüggemann1, •Guillaume Weick2, Fabio Pistolesi3, and Felix von Oppen4 — 1I. Institut für Theoretische Physik, Universität Hamburg, D-20355 Hamburg, Germany — 2Institut de Physique et Chimie des Materiaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, F-67034 Strasbourg, France — 3Laboratoire Ondes et Matiere dÁquitaine, Université de Bordeaux, CNRS UMR 5798, F-33400 Talence, France — 4Dahlem Center for Complex Quantum Systems & Fachbereich Physik, Freie Universität Berlin, D-14195 Berlin, Germany
We investigate the current noise of nanoelectromechanical systems close to a continuous mechanical instability. In the vicinity of the latter, the vibrational frequency of the nanomechanical system vanishes, rendering the system very sensitive to charge fluctuations and, hence, resulting in very large (super-Poissonian) current noise. Specifically, we consider a suspended single-electron transistor close to the Euler buckling instability [1,2,3]. We show that such a system exhibits an exponential enhancement of the current noise when approaching the Euler instability which we explain in terms of telegraph noise [4].
[1] G. Weick et al., PRB 81, 121409(R) (2010)
[2] G. Weick et al., PRB 83, 035420 (2011)
[3] G. Weick et al., PRB 84, 125454 (2011)
[4] J. Brüggemann et al., PRB 85, 125441 (2012)