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Seminars

Wednesday, 12.12.2018 10:00

RNDr. Jan Fikáček, Ph.D. (FZÚ AV ČR)

   Iron based chalcogenides (IBC) is a group of compounds where the presence of superconductivity (SC), together with relatively simple crystal structure, predestinates them as ideal candidates for both experimental and theoretical investigations. IBC are quasi two-dimensional in their crystal structure, which consists of two alternating layers purely composed of iron or a chalcogen. These form trilayers separated by Van der Waals gaps. FeSe was found to be superconducting below a critical temperature of Tc = 8 K . The pairing mechanism is believed to be unconventional, i.e...

Wednesday, 12.12.2018 16:00

Ortwin Hess (Imperial College London)

Nanoplasmonics and Metamaterials have in the last 15 years inspired scientists to think about photonics beyond traditional constraints imposed by natural materials in which light propagates to conceive functionalities such as subwavelength imaging and broadband ultraslow light. While most concepts have initially been demonstrated at longer wavelengths and for microwaves, they have continuously moved to optical frequencies and beyond. Embracing nonlinearity and (quantum) gain [1], exciting phenomena such as ‘dark-light’ [2] and cavity-free [3] nano-lasing and room temperature single...

Thursday, 13.12.2018 10:00

Pavel Chábera (Chemical Center, Lund University)

Abstract: Transition-metal complexes are widely used as photosensitizers and photocatalysts, and in light-emitting devices [Chem. Rev. 117, 10940 (2017)]. We have recently demonstrated first iron complex [FeIII(btz)3]3+ exhibiting room temperature photoluminescence from a charge transfer state and show that it has a 100 ps excited state charge transfer lifetime which is unprecedented for any iron complex [Nature 543, 695 (2017)]. This was characterized as a rare low-spin FeIII d5 complex with emission from a long-lived doublet ligand-to-metal charge transfer (2LMCT) state. Absence of...

Thursday, 13.12.2018 14:00

Dr. Marcus Niechciol (University of Siegen, Germany)

Abstract:

Due to their extremely high particle energies (up to 10^20 eV), cosmic rays are ideally suited to search for New Physics, for example violations of Lorentz invariance. In the following, isotropic, nonbirefringent Lorentz violation in the photon sector is considered, specializing to the case of a photon velocity larger than the maximum attainable velocity of standard Dirac fermions. Up to now, Earth-based bounds on this type of Lorentz violation have been determined from observations of TeV gamma rays. A novel approach to test Lorentz invariance with improved...

Thursday, 20.12.2018 15:00

Marek Vácha (Ústav etiky a humanitních studií, 3. lékařská fakulta UK Praha)

Abstrakt: Věda, víra a umění jsou spolu spojeny zájmem o stejný předmět, vesmír a lidskou bytost v něm. Každé z těchto tří vzepnutí lidstva má svůj vlastní přístup, svou metodologii a každé nasvěcuje Skutečnost ze svého úhlu pohledu. Není pravda umění proti pravdě vědy, a není ani pravda umění proti pravdě mystiky. Podobně není pravda víry, otázek po smyslu a účelu světa, proti pravdě vědy. Věda se snaží rozmontovat svět na součástky, aby viděla, jak vlastně funguje, víra se jej snaží opět sestavit v celek a ptá se, jaký to všechno má vlastně smysl.