Fyzikální ústav Akademie věd ČR

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Department 27

Akademie věd České republiky

Research at Department 27

Validity of Yubero-Tougaard theory to quantitatively determine the dielectric properties of surface nanofilmsSelected results

Reflection electron energy loss spectroscopy (REELS) at low energy is very surface sensitive and can be used to characterize the electronic properties of ultra-thin films and surface nano-structures. To extract reliable quantitative information from a REELS experiment it is essential to have accurate theoretical algorithms. In this work, we have studied the validity of a theoretical method proposed by Yubero and Tougaard to determine the dielectric function ε by analysis of an effective experimental REELS cross section determined by the Tougaard-Chorkendorff algorithm.  Celý text >>

Photoemission from Al(100) and (111): Experiment and ab initio theorySelected results

Owing to its simplicity aluminum is of fundamental importance for solid-state theory and thus has been a popular object of experimental and ab initio studies. Electronic structure of low index surfaces of aluminum has been theoretically addressed many times both within a semi-infinite crystal and within a supercell slab approach. A number of angle-resolved photoemission measurement have been reported, however, a consistent theory that would describe the observed energy distribution curves including the emission from surface states has not yet been published.  Celý text >>

Electron paramagnetic resonance (J. Rosa)Working groups

The research program is focused on the study of:

  • Intrinsic, impurity, radiation and light-induced paramagnetic-active defects in solids;
  • Physical properties of thin films and nanomaterials;
  • Local structure and dynamics of relaxors and disordered ferroelectrics;
  • Physical properties of new magnetoelectric materials, multiferroics and materials for spintronics.  Celý text >>

Laboratory of preparation of optical materials and thermal analysisWorking groups

Research team: Karel Nitsch, Miroslava Rodová, Antonín Cihlář, Robert Král

Scope
  • Searching for and preparation of materials - crystals, epitaxial layers, nanostructures and glasses - of high quality and purity with interesting optical properties and with their possible application in laser hosts in near IR range, as neutrons, gama and X-rays radiations detectors in industrial and medical application.
  • Preparation of model crystalline systems for luminescence mechanism study.  Celý text >>

Electron spectroscopy laboratory (P. Jiříček)Working groups

Electronic and structural properties of solid surfaces are studied by various electron spectroscopic methods. The basic equipment is angular-resolved photoelectron spectrometer ADES-400 (VG Scientific, UK).

Fig. 1: Photoelectron spectrometer ADES-400

  Celý text >>

Laboratoř diamantových vrstev a uhlíkových nano-struktur (A. Kromka)Working groups

Core facilities of Laboratory of diamond thin films and carbon nanostructures consist of two unique microwave deposition systems Aixtron P6 and Roth & Rau AK 400. Both deposition systems represent a microwave plasma assisted chemical vapor deposition. At present time, the system Aixtron P6 is routinely used for growth of nanocrystalline diamond thin films (NCD) (Fig. 1).  Celý text >>

Laboratory of optical and photoelectrical spectroscopy (M. Vaněček, A. Poruba, Z. Remeš)Working groups

Experimental equipment:
  1. Aparatura CPM (constant photocurrent method) Měření spekter optické absorpce v amorfních, nanokrystalických a mikrokrystalických tenkých vrstvách polovodičů (a-Si, μc-Si pro sluneční články, ...)
  2. FTPS (Fourier transform photocurrent spectroscopy) apparatus.  Celý text >>

Laboratory of luminescent and scintillation materials (M. Nikl)Working groups

Experimental equipment:
  1. Absorption and transmission spektrophotometer Shimadzu 3101 PC. Two-beam apparatus, 190-2500 nm. Reflection spectra, integration sphere accessory.
  2. UV-VIS luminescence spectrofluorometer 199S, Edinburgh Instrument. Excitation and emission spectra 200-800 nm. Decay kinetics measurements in the 0.1 ns - 1 s time scale. Excitation by hydrogen and deuterium lamps, X-ray tube.  Celý text >>

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