Fyzikální ústav Akademie věd ČR

Seminars

Chemical sensing by graphene field effect transistors

Tuesday, 04.03.2014 10:00 - 11:00

Jiří Červenka (School of Physics, The University of Melbourne)

Graphene's two dimensional nature, highly sensitive unique electrical properties and low intrinsic noise characteristics make it a prime candidate for the creation of a new generation of molecular sensors. Despite of high sensitivity of graphene sensors, their selectivity remains a major problem for their practical use. In this talk I present different strategies for selective sensing using graphene-based sensors.

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Magnetic properties of single molecules and metal-organic networks on surfaces

Tuesday, 04.03.2014 13:00 - 14:00

Katharina J. Franke (Freie Universität Berlin)

The magnetic properties of atoms and molecules on a surface are significantly affected by details in the atomic-scale surrounding. Manipulation of this surrounding provides the possibility to tune the electronic and magnetic functionality of surfaces on a nanometer scale. Using scanning tunnelling spectroscopy (STS), we show that the lifetime of excited spin states in the paramagnetic Fe-Octaethylporphyrin-Chloride (FeOEP-Cl) is orders of magnitude longer when the molecule is adsorbed on a superconductor as compared to a normal metal substrate.

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Calculating ultrafast magnetization dynamics

Tuesday, 04.03.2014 15:00

Karel Carva (Oddělení teoretické fyziky, katedry fyziky kondenzovaných látek, MFF UK)

Abstract: In recent years it has been demonstrated that magnetization can be changed without applying an external magnetic field in extremely short timescales of the order of hundreds of femtoseconds [1]. We have studied the effect by means of ab initio calculations for three ferromagnetic metals Fe, Co and Ni [2] considering the Elliott-Yafet electron-phonon spin-flip (SF) scattering [3] which has been suggested to be the dominant microscopic mechanism.

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The role of electrochemistry in semiconductor growth and degradation

Thursday, 06.03.2014 10:00 - 11:00

Kristin Poduska (Department of Physics and Physical Oceanography Memorial University of Newfoundland, Canada)

Electrochemical methods are widely applied to metal film deposition in industrial and high-tech settings, but the market share for semiconductor films produced using electrochemistry is dramatically less. At the same time, a large fraction of semiconductor-based devices rely on applied voltages for their operation, which means that electrochemical processes could occur in these devices wherever there exists an interface between an electron conductor (such as a semiconductor) and an ion conductor (such as water).

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Past seminars
Christelle Kadlec Metamaterials in the THz range 22.01.2013 10:00
Petr Trávníček Activities of the Institute of Physics in the Pierre Auger Observatory programme and other astroparticle physics projects 17.01.2013 14:00
Simone Babuin Quantum turbulence in flows of superfluid 4He 15.01.2013 15:00
Jiří Dohnal La Isla del Coco, or, Sharks are our friends 20.12.2012 15:00
Prof. Jacques Ferré First and Second Order Magneto-Optical Effects in Magnetic Bulk Materials or Ultrathin Films 10.12.2012 14:00
Jeevaka Weerasinghe Terahertz Dielectric properties of (Ba,Sr)TiO3 systems from First principles 04.12.2012 10:00
Karel Král Electron-phonon interaction in the photoluminescence of quasi-zero dimensional nanostructures 27.11.2012 15:00
Pavel Novák Calculation of crystal field parameters 15.11.2012 14:00
Martin Nikl R&D of inorganic scintillation materials in the Institute of Physics ASCR 14.11.2012 15:00
Pierre-Eymeric Janolin The twist and turns in perovskites 08.11.2012 10:00
Ilja Turek Ab initio theory of magnetic anisotropies in random tetragonal Fe-Co alloys 06.11.2012 15:00
prof. Toshiya Sakata In vitro biosensing with semiconductor-based platform 06.11.2012 10:00
Jaroslav Trnka Scattering Amplitudes and the Positive Grassmannian 05.11.2012 15:00
Jan Kuneš Electronic correlations in the vicinity of spin state transition 01.11.2012 14:00
Petr Čársky Determination of Structure of Diamond Nanoparticles by means of ab initio Calculations of Vibrational Excitation by Electron Impact 30.10.2012 15:00
Lothar Ley Colloquium 2012, Cukrovarnická 24.10.2012 10:00
Christian Maes It increases with time - what is it? 23.10.2012 15:00
Roberto Robles Electronic and magnetic properties of supported transition metal phthalocyanines 23.10.2012 10:00
Dr. Dieter Van Den Bleeken Scaling solutions and pure Higgs states 22.10.2012 15:00
Florian Loder Interface-superconductivity in the presence of Rashba spin-orbit coupling and magnetic fields 18.10.2012 15:00
Ivan Pelant Progress in luminescence spectroscopy 17.10.2012 15:00
Leszek Jurczyszyn Theoretical studies of the adsorption and diffusion processes on W(111) and W(112) surfaces 16.10.2012 15:00
Ondřej Šipr, Juan Manuel Perez-Mato, Branton J. Campbell Magnetické struktury a jejich symetrie 15.10.2012 09:00
Luca Lopez Cubic interactions of higher spins in (A)dS 08.10.2012 15:00
Petr Závada Deep inelastic scattering kinematics in covariant approximation (II) 05.10.2012 13:30
Pavel Bakule Science Café – the next lecture on ELI Beamlines 02.10.2012 19:00
Marek Pasciak Local structure of selected perovskite compounds: Diffuse scattering and atomistic simulations 02.10.2012 15:00
Dr. István Jánossy Some optical effects in azo-dye containing liquid crystals and polymers 25.09.2012 10:00
Toshifumi Noumi Constraints on a class of classical solutions in open string field theory 24.09.2012 15:00
Klaus Mann From deep UV to soft x-rays: Overview of research at short wavelengths in the Laser Lab. Göttingen 20.09.2012 10:00

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