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Seminars and workshops of department 12

Seminář / Tuesday, 10.12.2019 10:00

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...

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Seminář / Tuesday, 26.11.2019 10:00

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...

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