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O: Fachverband Oberflächenphysik

O 96: Metallic Nanowires on Semiconductor Surfaces

O 96.2: Vortrag

Donnerstag, 23. März 2017, 15:15–15:30, WIL C107

Ginzburg-Landau-Langevin theory for the phase transition in In/Si(111) — •Yasemin Ergün and Eric Jeckelmann — Appelstraße 2, 30167 Hannover

We investigate thermal fluctuations and collective excitations in quasi-one-dimensional charge-density-wave systems using the Ginzburg-Landau (GL) theory. Starting from a microscopic Su-Schrieffer-Heeger-like model for In/Si(111), we generalized the GL theory for grand canonical Peierls transitions. The equilibrium properties and the non-equilibrium dynamics are simulated using the Langevin approach. We calculated the phonon spectrum for the Landau-Langevin theory. We discuss our theoretical results in relation to doping and spectroscopy experiments for In/Si(111). Extending this approach for local fluctuations within a two-dimensional Ginzburg-Landau-Langevin is computationally expensive. We developed a frequency filter for smoothing fluctuations included in the linear response spectrum by finite simulation size and time. Support from the DFG through the Research Unit FOR 1700 is gratefully acknowledged.