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Semináře sekce

Úterý, 10.12.2019 10:00

Bei Yi Zhu (National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, China)

Abstract: We study the vortex ratchet effects in superconducting asymmetric curved bridges. By transport measurements, we find that the rectified dc voltages are significantly enhanced, and we obtain clearly asymmetric voltage waveforms versus time in one period. The rectification effect can be achieved in a very wide range of temperatures, currents and magnetic fields. Based on the simulations of time-dependent Ginzburg-Landau equations, we demonstrate that the giant ratchet effects are mainly caused by the collective behavior of vortices in this asymmetric structure, which is quite...

Čtvrtek, 28.11.2019 10:00

prof. Mikhael D. Levi (Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel)

Depending on a variety of factors (electrode thickness, morphology, mechanical properties such as stiffness/compliance), the quartz crystal resonator coated with thin electrode coatings oscillates in a typically MHz frequency range on multiple harmonics operating in either gravimetric or beyond-the-gravimetric modes. The latter mode provides important real time information about the mechanical properties of the electrodes during their charging/discharging. Starting from a simple gravimetric monitoring of dynamics of ions adsorption into nanoporous carbon supercapacitors, 1 we have further...

Úterý, 26.11.2019 10:00

Gorm Olle Steffensen (Niels Bohr Institute, Copenhagen)

Abstract: Progress in microfabrication has allowed fabrication of highly tuneable semiconductor-superconductor heterostructures yielding new platforms to both create and manipulate subgap states. Such bound states, isolated in energy by the superconducting gap, are important building blocks for many schemes of quantum computation. In this talk I will present how bound states arise in Quantum Dot-Superconductor systems, how we can model them and what we can learn from transport measurements. Finally, I will address the complexity in experiments with double quantum dots and the physics it...

Pondělí, 25.11.2019 14:00

Izabela Jendrzejewska (University of Silesia, Institute of Chemistry, Szkolna 9, Poland)