Fyzikální ústav Akademie věd ČR

Semináře a workshopy oddělení 26

Inelastic Electron Tunneling through an Adatom: Selection Rules and Orbital Exchange

Seminář / Úterý, 16.05.2017 10:00 - 11:00

I investigate tunneling of electrons from an STM tip to a substrate through a magnetic adatom by means of the Anderson impurity model. I employ an approximation analogous to the cotunneling theory [1] and concentrate on f-electron adatoms with large spin-orbital coupling. I compare the obtained inelastic electron tunneling spectra (IETS) with predictions of the spin model that has been very successful in the case of transition-metal adatoms [2]. When the spin model is applied to f electrons, the adatom spin S is replaced with its angular momentum J [3,4]. 

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Atomic-Scale Engineering of Solid Interfaces: Towards Enhanced Electronic and Optoelectronic Functionalities

Seminář / Čtvrtek, 18.05.2017 15:00 - 16:00

Electronics and optoelectronics technologies rely on the control of electric charge at the interfaces between active materials of solid-state devices. This behaviour is dictated by quantum mechanical phenomena unfolding at the nanoscale and depends strongly on the atomic-scale morphology of these systems. Controlling the atomic-scale structure of such interfaces is hence essential for optimizing the electronic and optoelectronic properties of solid-state systems, with potential for developing enhanced nanoelectronics, light-harvesting and light-emitting technologies.

 

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Tailoring graphene electronic, chemical and mechanical properties: interaction with metals, Moire Patterns and the role of defects

Seminář / Úterý, 30.05.2017 10:00

The talk will start with a brief summary of the research activity of the SPMTH group, in particular, our recent developments to describe tip-sample transport and interactions for the simulation of STM and AFM [1,2], reducible oxides for catalysys and optoelectronics [3], graphene edge states and vacancy-induced magnetism [4], and the challenges involved in the imaging of surfaces and large biomolecules in their native liquid environment [5,6].

 

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STM investigation of laser driven processes at surfaces

Seminář / Úterý, 13.06.2017 10:00 - 11:00

While photochemistry in the gas phase demands a resonant excitation of the molecules, the presence of a metal surface in surface chemistry opens a different pathway via the creation of hot electrons in the metal and subsequent attachment of these energetic electrons to adsorbed molecules. We use two set-ups that combine a low-temperature scanning tunneling microscope operating below 10 K with a frequency doubled femto-second laser and a tunable pico-second laser, respectively, to investigate processes induced by these electrons on a single molecule basis.

 

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Minulé semináře a workshopy
Latha Venkataraman Controlling Single-Molecule Circuits Through Electrolytic Environment 21.04.2017 15:00
Karl-Heinz Ernst Helical Molecules and Surfaces: Self-Assembly, Spin Filtering and Unidirectional Motors 06.04.2017 10:00
David Ecija 2D Lanthanide-Directed Architectures on Surfaces 04.04.2017 10:00
Thomas Seyller Epitaxial Graphene on SiC 28.03.2017 10:00
Alexey A. Popov Endohedral metallofullerenes: in cavea redox reactions and single molecule magnetism 15.03.2017 15:00
Enrique Montes Transport phenomena in nanowires, nanotubes, and other low-dimensional systems 14.03.2017 10:00
Ladislav Kvasz Galileo, Descartes and Newton – founders of the language of physics 28.02.2017 10:00
Petr Cígler Fluorescent nanodiamonds as non-photobleachable responsive probes 02.02.2017 15:00
Aran Garcia-Lekue Understanding the electronic and transport properties of graphene nanostructures 24.01.2017 10:00
Aitor Mugarza Electronic and magnetic properties of single molecules at the metallic interface 06.12.2016 10:00

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