Fyzikální ústav Akademie věd ČR

Semináře

Út, 07/03/2017 - 10:00 - 11:00

Fumito Araoka (Physicochemical Soft Matter Research Unit RIKEN Center for Emergent Matter Science (CEMS), Japan)

Abstract: Topological defects in nematic liquid crystals are ubiquitous. The defect studies are important in understanding the fundamental properties of the systems, as well as in practical applications, such as colloidal self-⁠assembly, optical vortex generation and templates for molecular self-⁠assembly.

Čt, 09/03/2017 - 13:00 - 16:00

Ing. Miloslav Klinger

Progam CrysTBox je sada softwarových nástrojů k analýze difrakčního a přímého obrazu v transmisním elektronovém mikroskopu. Workshop představí jeho možnosti a poskytne zájemcům pro práci s ním základní trénink v jeho používání.

Út, 14/03/2017 - 10:00 - 11:00

Enrique Montes (Fyzikální ústav AV ČR)

First principles calculations have been implemented to study the ground state and electron transport properties of nanoscale materials and to evaluate its performance in electronic devices (magnetic tunneling junctions, field effect transistors and gas sensors). The ground state properties are studied within density functional theory using the SIESTA code, whereas the transport properties are investigated using the non-equilibrium Green’s functions formalism implemented in the SMEAGOL code.

Út, 14/03/2017 - 15:00 - 17:00

Ondřej L. Křivánek (Nion Company)

Monochromated, aberration-corrected scanning transmission electron microscopes (MAC-STEMs) are able to form intense electron probes as small as 0.5-1 Å in diameter, analyze single atoms spectroscopically (by electron energy loss spectroscopy (EELS) or energy-dispersive X-ray spectroscopy (EDXS)), detect vibrational EEL spectra, and perform many other types of experiments that we did not think would become possible as recently as 5 years ago.

St, 15/03/2017 - 15:00 - 16:00

Alexey A. Popov (Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069 Dresden, Germany)

Fullerenes encapsulating metal atoms in their interior are known as endohedral metallofullerenes (EMFs). Since the first discovery of EMFs in the gas phase in 1985 and development of their arc-discharge synthesis in early 1990s, the field of EMFs showed dramatic advancement. Carbon cage shields endohedral species from environment and thus stabilizes different types of metal clusters, which cannot exist by themselves. Exotic valence and spin states can be realized for such clusters.

Út, 28/03/2017 - 10:00 - 11:00

Thomas Seyller (TU Chemnitz, Institut für Physik, Reichenhainer Str. 70, 09126 Chemnitz, Germany)

Ten years ago, ground-breaking experimental studies of graphene – a monolayer of carbon with honeycomb structure – were reported. Charge carriers in graphene are described by the Weyl-Hamiltonian for massless particles, resulting in interesting properties such as an unusual quantum Hall effect or Klein tunneling which sparked the interest of scientists around the world. They are characterized by a high mobility, which makes graphene interesting for electronic applications such as high frequency transistors and frequency mixers.

Út, 28/03/2017 - 14:00 - 16:00

Thibault Derrien (HiLASE, Dolní Břežany )

Čt, 06/04/2017 - 15:00 - 16:00

Karl-Heinz Ernst (Empa, Swiss Federal Laboratories for Materials Research and Technology Department of Chemistry, University of Zurich )

The Nobel Prize for Chemistry 2016 is shared by Jean-Pierre Sauvage, J. Fraser Stoddard and Ben Feringa for the development of molecular machines. The three researchers designed molecules with subunits that moved relative to each other in a controlled manner, and therefore founded a new field in chemistry. Some of their molecules can, for example under influence of light, even fulfill work. The three laid the foundation for nanoscopic motors, like molecular escalators, molecular muscles and nanocars.

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