Nacházíte se

Domů » Semináře

Semináře

Vortex ratchet effects in superconducting curved bridge

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...

Více »

Inchworm Impurity Solver for General Hybridizations and Interactions

Úterý, 10.12.2019 15:00

Eitan Eidelstein (Department of Physics, NRCN, Beer Sheva, Israel )

Abstract: I will present a numerically exact Inchworm Monte Carlo method for equilibrium multiorbital quantum impurity problems with general interactions and hybridizations. I'll show that the method, originally developed to overcome the dynamical sign problem in certain real-time propagation problems, can also overcome the sign problem as a function of temperature for equilibrium quantum impurity models. This is shown in several cases where the current method of choice, the continuous time hybridization expansion, fails due to the sign problem. Our method therefore enables...

Více »

Wentzel Jamnitzer’s work Perspectiva corporum regularium from 1568 and its relationship to emergence of modern science

Čtvrtek, 12.12.2019 15:00

Jan Fábry (Fyzikální ústav AV ČR, oddělení dielektrik)

Abstract: The discussed Wentzel Jamnitzer’s work belongs to works which have been published most frequently throughout the 15-th and 16-th centuries and which depicted Platonic (regular) bodies. It was believed at that time that these bodies comprised the essence of nature of the surrounding world, which was percepted by external senses, or exclusively accessible by intellect. Complexity of the surrounding world could be symbolized by a geometric combination of the Platonic bodies which gave rise to semiregular or even more complicated bodies.

Více »

Galaxy spins as probes of fundamental physics

Pondělí, 16.12.2019 16:00

Pavel Motloch (Canadian Institute of Theoretical Astrophysics)

Abstrakt: Measurements of galaxy angular momenta can, at least in principle, be used to probe fundamental physics such as primordial gravitational waves and non-Gaussianity. In my talk I explain how galaxy spins arise from the initial density perturbations, describe how they are sensitive to various physical parameters of interest and finally detail our related observational effort.

Více »

Minulé semináře

prof. Mikhael D. Levi Unique Material Characterizations of Energy Storage and Conversion Electrodes Using Acoustic Spectroscopy by EQCM-D (Electrochemical Quartz Crystal Microbalance with Dissipation Monitoring) 28.11.2019 10:00
Gorm Olle Steffensen Build a Bound State – Coupling Quantum Dots to Superconductors 26.11.2019 10:00
Izabela Jendrzejewska Synthesis, structure and physicochemical properties of spinel compounds doped with selected elements: p-, d- and f- electronics 25.11.2019 14:00
Koen A. de Mare Effective model of antiferromagnetic MnTe 19.11.2019 16:00
Daria Medvedeva Study of influence of non-local interactions on the properties of the systems with strong electron correlations 19.11.2019 15:00
Dr. Oleg Sidletskiy Optical peculiarities in carbon-doped garnets 05.11.2019 13:00
Jiajun Li Dynamics and Hidden Phases in Photo-Excited Mott Insulators 01.11.2019 12:00
Klára Uhlířová The influence of Cu-Mn content on the structural and physical properties of bulk CuMnAs 30.10.2019 15:00
Dr. Jagdheesh Radhakrishnan Water Repellent Surface Structures by Laser Patterning 29.10.2019 14:00
Alireza Kashir Strain Engineering of Lattice Dynamics and Spin-Phonon Interaction in Rocksalt Magnetic Binary Oxides 24.10.2019 10:00

Stránky