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DY: Fachverband Dynamik und Statistische Physik

DY 9: Brownian Motion and Transport (Joint session DY/ CPP/ TT)

DY 9.6: Vortrag

Montag, 16. März 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.