Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.75: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Ginzburg-Landau theory for collective excitations in In/Si(111) — •Yasemin Ergün and Eric Jeckelmann — Leibniz Universität Hannover, Germany

We investigate the dynamics of collective excitations in Peierls insulators using the Ginzburg-Landau (GL) theory for quasi-one-dimensional charge-density-wave systems. Starting from a microscopic Su-Schrieffer-Heeger-like model for In/Si(111), we generalized the GL theory for systems with several Peierls modes. This formalism allows us to study the vibrations and the non-equilibrium dynamics of collective "amplitude" modes (lattice distortion and density modulation) which are involved in a Peierls transition. We discuss our theoretical results in relation to spectroscopy experiments for In/Si(111). Support from the DFG through the Research Unit FOR 1700 is gratefully acknowledged.