Conveners
Evening Session
- Andrii Shcherbakov (Walter Schottky Institute Technical University of Munich)
We investigate thermalization in a quantum Fermi - Pasta - Ulam - Tsingou problem for anharmonic vibrations in atomic chains applying semi-quantitative analysis of resonant interactions complemented by exact numerical studies. We estimate the energy at transition from the localized low-energy phase to the chaotic high-energy phase. The transition energy is inversely proportional to the number...
Laser-induced periodic surface structures (LIPSS) are very common phenomena that arises from interaction between different surfaces and femtosecond laser pulses. Characteristic size of such structures is laser wavelength order and typically belongs from nano- to micro-scale range. Searching new material surfaces for the nanostructuring are significant scientific interest of these days. We are...
A change in the structure of a material under the action of laser radiation can occur if the energy of light, transmitted to some area of the material, exceeds the energy of interatomic bonds in this area. The magnitude of the excess and the time, during which the energy is transferred, are both important. If the duration of the laser pulse is longer than the time of thermal relaxation, then...
Ultrafast lasers can be used to produce sound waves in a medium. Usually, the laser beam is focused onto the sample that partially absorb the light. The transient heating of the sample produces transient mechanical stresses that lead to ultrasonic transduction. Since the discovery of ultrafast lasers, the generated sound waves have reached ultrafast timescales, in the picosecond regime, with...
Germanium tin (GeSn) semiconductors are promising absorber/emission materials for the novel infrared (IR) optoelectronic devices. The main advantage of these materials is the possibility to obtain a higher absorptivity in comparison with indirect-bandgap crystalline silicon, germanium, and their alloys. The GeSn/Ge/Si heterostructures were grown by a chemical vapor deposition method. An...
The study in non-equilibrium conditions of an emblematic class of quantum materials, the Mott insulators, is currently developing into an active and fruitful branch of solid-state physics. Recent researches indeed demonstrate that Mott insulators excited either by ultrafast infrared or THz laser pulses or by electric fields might display non-trivial insulator to metal transitions (IMT’s) whose...
