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Article
Evidence of a field-induced Berezinskii–Kosterlitz–Thouless scenario in a two-dimensional spin–dimer system
Two-dimensional (2D) systems with continuous symmetry lack conventional long-range order because of thermal fluctuations. Instead, as pointed out by Berezinskii, Kosterlitz and Thouless (BKT), 2D systems may e...
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Article
Atomistic simulation of the laser induced damage in single wall carbon nanotubes: Diameter and chirality dependence
The effect of high energy laser pulses on single wall carbon nanotubes (SWNT) is studied by a non-equilibrium quantum mechanical model. For the studied laser parameters, we find ablation thresholds that vary b...
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Article
Laser-induced coherent phonons in graphite and carbon nanotubes: model and simulations
We present a microscopic description of the excitation of coherent phonons as a response to femtosecond laser excitation. Using molecular dynamics simulations based on a tight-binding electronic Hamiltonian we...
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Chapter
Ultrafast Structural Changes Induced by Femtosecond Laser Pulses
A theoretical approach to treat laser induced femtosecond structural changes in covalent solids is described. Our approach consists in molecular dynamic simulations performed on the basis of a time-dependent, ...
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Chapter and Conference Paper
Femtosecond laser-induced ablation of graphite
The dynamics of fs-laser ablation of graphite has been investigated experimentally and theoretically. The experimental observation of two different ablation mechanisms is supported by molecular dynamics calcul...
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Article
Theory for the ultrafast dynamics of excited clusters: interplay between elementary excitations and atomic structure
We present a theoretical study of the short-time relaxation of clusters in response to ultrafast excitations using femtosecond laser pulses. We analyze the excitation of different types of clusters (Hgn, Agn, Sin
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Article
Theory for laser-induced ultrafast phase transitions in carbon
The response of carbon to femtosecond laser pulses of arbitrary form, different durations, and different intensities is studied theoretically. We perform molecular dynamics simulations based on a microscopic ...
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Chapter
Ultrafast Structural Response and Nonlinear Fragmentation Dynamics of Small Clusters Induced by Optical Excitation
The ultrafast relaxation of small clusters immediately after ionization and photodetachment is theoretically studied. Microscopic models are proposed to describe the non-equilibrium dynamics of the clusters. A...