Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 25: Brownian Motion and Transport (jointly with DY, CPP)
TT 25.6: Talk
Monday, March 16, 2015, 16:45–17:00, BH-N 243
Dynamics of stochatic resisitive switching — •Paul Radtke1, Arthur Straube1, Andrew Hazel2, and Lutz Schimanksy-Geier1 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2School of Mathematics, University of Manchester, Manchester, UK
Classes of dielectrics such as TiO2 alter their resistance under the influence of an electric field or a current flowing through the system, an effect called resistive switching (RS). Thereby the resistance depends also on the past states of the system, it has a memory.
We will show how a particular one-dimensional lattice model for a bipolar device. In it, oxygen vacancies hop in between consequetive sites and thereby alter local resistances. Their dynamics governed by a Master equation with jumping rates modulated by an external electric field. We discuss the system properties and show that dynamics of the vacancies can be formulated in terms of a Burgers like equation. With its help the underlying motion of the oxygen vacancies is interpreted as nonlinear traveling waves.