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Events

Seminar / Thursday, 23.11.2017 13:00

P. Roca i Cabarrocas (LPICM-CNRS, Ecole Polytechnique, 91128 Palaiseau, Cedex, France; Institut Photovoltaïque d’Ile-de-France (IPVF), 8 rue de la renaissance, 92160 Antony, France)

Plasma Enhanced Chemical Vapor Deposition using a capacitively-coupled RF glow discharge has become the standard technique for the production of amorphous and microcrystalline silicon thin films. Over the past years we have been using the plasma synthesized silicon clusters and nanocrystals to improve the electronic properties of polymorphous and microcrystalline silicon while increasing their deposition rate [1]. Interestingly enough the same conditions which result in pm-Si:H on glass substrates lead to epitaxial growth on 100 oriented c-Si substrates [2]. Exploring these plasma...

Seminar / Friday, 24.11.2017 15:00

Dr. Krste Pangovski (Dolní Břežany, HiLASE)

The development of the new laser technologies is being driven by industrial demand for high repetition rate, high beam quality and high average/peak power. One only needs to take a casual stroll through any photonics conference to appreciate that there have been startling developments in such laser sources in recent years. Despite these advances, industrial laser process designers still rely heavily on large parametric sweeps, while quality control still relies on post-process evidence. From the industrial point of view, these advances have opened up a vast parameter space that is often...

Seminar / Wednesday, 29.11.2017 10:00 to 12:00

Dr. Ashley Bucsek (Colorado School of Mines, Golden, USA)

Abstract

In the case of shape memory alloys (SMAs), fundamental micromechanical theory has been an active area of research for more than 70 years. However, experiments to validate these theories on the microstructural scale are relatively new, challenging, and often limited to two-dimensional surface measurements. As a result, there persists a general lack of understanding regarding the relationships that link microstructure evolution to macroscopic behavior. To address this open area, we utilize cutting-edge in situ synchrotron X-ray techniques such as near-field...

Seminar / Thursday, 30.11.2017 14:00

N. R. Papior (Center for Nanostructured Graphene (CNG), DTU Nanotech, DTU, Denmark E-mail: nickpapioratgmail [dot] com)

I will present the recent development of N≥1 electrode NEGF simulations which enables simulations of multiprobe physics. The specific implementation will be presented [1,2] and the efficiency and scalability of the code (TranSIESTA) will be emphasized. The code implements hybrid parallelization which easily enables efficient calculations of systems with more than 10,000 orbitals under non-equilibrium, see Fig. 1 which shows the maximum memory usage with respect to system size (x-axis) and electrode size (yaxis), left. The right shows the computation time of a single SCF with NEGF. Using...

Seminar / Tuesday, 05.12.2017 10:00

Matthias Bode (Lehrstuhl für Experimentelle Physik II, Julius-Maximilians-Universität Würzburg)

It is known for quite a while that charge currents between the tip of a scanning tunnelling microscope (STM) and a molecule can induce molecule isomerization, i.e., the molecule maintains its chemical formula but changes its structure. For example, the hydrogen atom in the centre of the HPc molecule can occupy four different positions. Whereas usually performed with the STM tip positioned directly over the molecule, recent experiments demonstrated remote STM-induced isomerization, where isomerization is triggered by charge carriers injected at a distance of several nanometers from the...

Seminar / Thursday, 07.12.2017 14:00

Ivan Rungger (National Physical Laboratory, Teddington, TW11 0LW, United Kingdom)

The theoretical understanding of the atomic and electronic structure, and of the resulting electron transport phenomena at the atomic scale is essential for the design of new nanoscale devices. While standard density functional theory (DFT) based quantum transport simulations can usually explain experiments on a qualitative level, the quantitative agreement is rather poor due to the often incorrectly predicted energy level alignment and charge transfer at metal/molecule interfaces. In this talk we will first give an overview of the limitations of DFT, and then present the required...

Seminar / Tuesday, 12.12.2017 10:00

Harold J.W. Zandvliet (Physics of Interfaces and Nanomaterials and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands)

Recently, a few research groups have reported the growth of germanene, a new member of the graphene family [1]. Germanene is in many aspects very similar to graphene, but in contrast to the planar graphene lattice, the germanene honeycomb lattice is slightly buckled and composed of two vertically displaced sub-lattices. Frist principles total energy calculations have revealed that free-standing germanene is a two-dimensional Dirac fermion system, i.e. the electrons behave as massless relativistic particles that are described by the Dirac equation, i.e. the relativistic variant of the...

Conference / Monday, 02.07.2018 09:00 to Friday, 06.07.2018 18:00

We are delighted to invite you to Prague in the Czech Republic for the “jubilee” 45th EPS Conference on Plasma Physics from 2nd to 6th July 2018.

The conference covers a broad range of plasma science spanning from nuclear fusion to low temperature plasmas, and astrophysical plasmas to laser plasma interaction. The event is organized under the auspices of the European Physical Society (EPS) Plasma Physics Division by the ELI Beamlines Czech Republic (Institute of Physics of the Czech Academy of Sciences) and will take place in the famous historical Žofín Palace and the Mánes Gallery...