Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 5: Atomic Systems in External Fields I

A 5.4: Talk

Monday, March 2, 2009, 17:30–17:45, VMP 6 HS-B

A quantum fluid perspective on electron dynamics — •Mark Thiele and Stephan Kümmel — Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth

The fluid dynamic formulation of quantum mechanics provides an intuitive way to interpret phenomena of many-electron physics. We use this approach to study the dynamics of bound electrons in time-dependent external fields. Comparing exact solutions of the interacting Schrödinger equation and of adiabatic time-dependent density-functional theory, we investigate both nonlinear and linear effects such as strong field excitation and photoabsorption. We find that viscous dissipation is the fluid dynamical mechanism connecting doubly excited states in atoms to the appearance of memory effects in density-functional theory.