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Péter Lévai (Wigner RCP)18/09/2023, 08:30
Star Auditorium
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Wolfgang Schleich (University of Ulm)18/09/2023, 09:00
The Wigner function [1] is a quantum mechanical distribution function and lives in phase space. It allows us to evaluate the expectation values of symmetrically ordered operators. Moreover, it is an extremely useful tool [2] to analyze phenomena at the interface of classical and quantum physics. In the present talk, we focus on three such topics: (i) The equivalence principle of general...
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Tamás Gombosi (University of Michigan)18/09/2023, 09:40
A hundred years ago, the sun-Earth connection was of interest to only a small number of scientists. Solar activity had little effect on daily life. Today, a single strong solar eruption could bring civilization to its knees. Modern society has come to depend on technologies sensitive to solar radiation and geomagnetic storms. Particularly vulnerable are power grids, interplanetary robotic and...
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Vitor Cardoso (Niels Bohr Institute)18/09/2023, 11:00
One of the most remarkable possibilities of General Relativity concerns gravitational collapse to black holes, leaving behind a geometry with light rings, ergoregions and horizons. These peculiarities are responsible for uniqueness properties and energy extraction mechanisms that turn black holes into ideal laboratories of strong gravity, of particle physics (yes!) and of possible...
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Ferenc Krausz18/09/2023, 11:40
Attosecond metrology emerged on the turn of the milleneum and enabled scientists to observe fundamental electronic processes in atoms, molecules, or solids in real time. Attosecond techniques now permit measurement of the oscillating electric field of light from the infrared to the ultraviolet. We will discuss how this unprecedented technical capability may help advance electronic signal...
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Marco van Leeuwen (Nikhef)18/09/2023, 13:50
Collisions of lead nuclei at high energy in the Large Hadron Collider (LHC) at CERN provide a unique opprotunity to study the 'condensed matter physics' of quarks and gluons, the fundamental particles of the strong interaction, which are normally bound in hadrons. In these collisions, temperatures of around 10^12 K are reached, and a plasma of quarks and gluons is formed, under conditions that...
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Viktor Veszprémi (Wigner RCP)18/09/2023, 14:30
Measurements at the frontier of particle physics performed by the LHC experiments have been a great success when considering the discovery of the Higgs boson. This was an important missing piece in the puzzle of the standard model that governs particle interactions. However, all other measurements have not provided results incompatible with this theory, thus showing no pointer towards...
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Gergely Barnaföldi (Wigner RCP)18/09/2023, 14:50
Shortly, milliseconds after the Big Bang, the Universe was formed of a dense and hot matter, the quark gluon plasma. The properties of this strongly interacting medium set the initial condition of the expansion of the Universe later on. Heavy-ion researchers aim to address the questions: How this matter look like? What are the physical properties of this state? Can we re-create this matter in...
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Martin Schultze (TU Graz)18/09/2023, 15:40
Electrons have little mass and they are strongly interacting with their environment via Coulomb forces which led to their dynamics appearing perfectly synchronized to external stimuli. E.P. Wigner and colleagues anticipated already in the 1950's that in photoionization a time shift between the outgoing electronic wavepacket and the arrival time of the incoming photon is to be expected due to...
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Péter Dombi (Wigner RCP)18/09/2023, 16:20
Few-femtosecond laser pulses offer a unique potential to control various electron processes in solid-state media. These include the generation of hot electrons [1], inducing nonadiabatic tunneling photoemission [2] and inducing the transient metallization of dielectric media [3]. In my talk, I will review recent experimental progress of the Wigner Research Centre for Physics in each of these...
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Miklós Veres (Wigner RCP)18/09/2023, 16:40
Being a non-invasive optical spectroscopic tool with high sensitivity to the bonding configuration Raman spectroscopy is widely used to study different materials, including organic and biological systems. Due to its small scattering cross-section, the Raman process is weak, however, it can be enhanced by metallic nanoparticles acting as plasmonic nanoantennas amplifying the Raman signal. This...
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Péter Domokos (Wigner RCP)19/09/2023, 09:00
The Quantum Information National Laboratory (QNL) boosts the research and development activity of the Hungarian scientific community within the unfolding second quantum revolution which aims at the exploitation of the enormous advancements in our ability to detect and manipulate single quanta for new kinds of applications. We give an overview on the QNL activity via selected outstanding...
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Péter Hartmann (Wigner RCP)19/09/2023, 09:40
Experiments on strongly coupled dusty plasmas provide unique access to the microscopic details of macroscopic condensed matter processes. Since the early years of this field, the application to hydrodynamic processes has been one of the main motivations. In most cases, however, the complexity of the experiments prevented the drawing of general conclusions. In our experiment, using the control...
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Tamás Börzsönyi (Wigner RCP)19/09/2023, 10:00
When a granular material or a suspension containing elongated particles is flowing we observe that the particles get aligned. This is due to the non-trivial rotation of the grains in a shear flow. How long does it take for the grains to get ordered? In which direction do they align? What is the consequence of ordering on the rheology? Do elongated particles flow easier than spherical ones? In...
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István Szapudi (University of Hawaii)19/09/2023, 10:50
I will review two recent techniques for cosmological N-body simulations. The StePS simulations use a stereographic projection to compactify the universe and fit it into a finite computer. The resulting multiresolution technique is more efficient than standard zoom-in simulations and has isotropic gravity. Complementary simulations augment an existing simulation by minimizing cosmic variance by...
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István Rácz (Wigner RCP)19/09/2023, 11:30
We outline an argument proving that any smooth vacuum spacetime containing a compact Cauchy horizon with surface gravity that can be normalized to a nonzero constant admits a Killing vector field. This proves a conjecture of Moncrief and Isenberg from 1983 under the assumption on the surface gravity and generalizes previous results due to Moncrief–Isenberg and Friedrich–Rácz–Wald, where the...
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Péter Kovács (Wigner RCP)19/09/2023, 11:50
Neutron stars (NSs) are the most massive known objects in the Universe. Their masses range from 1.2 to 2.3 solar masses, while their radii are in the range of ~10 km. The density increases towards the origin of the star, and can reach 4-6 times the normal nuclear density. The matter in these circumstances is organized by the strong interaction, and it is possible that quark-gluon plasma can be...
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Aleksandr Chumakov (European Synchrotron Radiation Facility)19/09/2023, 13:50
For visible light, the concept of spectrographic imaging — dispersion of
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radiation components with various energies in space — has been known since
Newton’s time. In this presentation, we report on a hard (14 keV) x-ray
spectrograph implemented at the European synchrotron, enabling an
observation of anomalous soft modes in alpha-iron [1]. We present new
unpublished data on temperature... -
Dániel Merkel (Wigner RCP)19/09/2023, 14:30
Recently, FeRh thin films have attracted extensive attention, due to the diversity of their possible applications [[i]]. Their near room temperature metamagnetic transition from antiferromagnetic (AF) to ferromagnetic (FM) order [[ii],] and the interoperability between FM and paramagnetic (PM) states provide an excellent base for energy-saving spintronic devices [[iii]]. Moreover, the...
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György Vankó (Wigner RCP)19/09/2023, 14:50
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Gernot Alber (Technical University of Darmstadt)19/09/2023, 15:40
Detection of genuine quantum correlations, such as entanglement or steerability, by local quantum measurements, which can possibly be performed by far distant observers, are of particular interest for applications in quantum key distribution and quantum communication.
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In this context the natural question arises how does the effectiveness of detecting such genuine quantum correlations depend... -
Tamás Kiss (Wigner RCP)19/09/2023, 16:20
Nonlinear evolution is not a usual phenomenon in quantum physics. It is possible to define a time-evolution for an ensemble of equally prepared systems in a somewhat unusual way: take N systems, apply an entangling unitary transformation, measure all but one of the systems and, depending on the measurement results, keep or throw away the remaining system. This procedure applied to the whole...
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Adrián Solymos (Wigner RCP)19/09/2023, 16:40
Symmetries play a fundamental role in physics: from conservation laws and the unification of different theories to the simplification of complex problems to tractable ones. They are an indispensable tool and continue to be a driving force in research. This talk explores two topics from Quantum Information Science that places symmetry, and
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therefore group theory, in the spotlight. First, the... -
Zhandos Moldabekov (Center for Advanced Systems Understanding at Helmholtz-Zentrum Dresden-Rossendorf)19/09/2023, 17:00
A linear response of quantum electrons is well studied and for that well developed theoretical and computational methods computing the linear response properties are available. However, recent introduction of THz lasers and the novel seeding technique to reach high intensities [1] allow us to generate nonlinear response of quantum electrons in extended systems. Therefore, in this talk the...
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Katalin Kamarás (Wigner RCP)20/09/2023, 09:40
Scattering near-field optical microscopy (s-SNOM), based on the combination of atomic
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force microscopy and frequency-dependent light scattering, is an emerging method that combines high spatial resolution with high sensitivity even at long illuminating wavelengths.
I will present results in the infrared frequency range obtained on various aspects of carbon nanostructures. The most... -
Őrs Legeza (Wigner RCP)20/09/2023, 10:00
Tensor network states algorithms have proven to be a powerful tool for simulating strongly correlated spin and fermionic models. In this contribution, we overview recent developments that can be used for the treatment of high-dimensional optimization tasks used in many-body quantum physics with long range interactions, ab initio quantum chemistry and nuclear structure theory. We will also...
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Géza Erdős (Wigner RCP)20/09/2023, 11:20
The ELKH Institute of Geophysics and Space Science and the ELKH Wigner Physics Research Centre jointly built a zero magnetic field laboratory in the Széchenyi István Geophysical Observatory, near Nagycenk. The construction of the research infrastructure was completed in the summer of 2023, the commissioning is in progress. The primary purpose of the facility is to build and calibrate...
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Zsófia Bebesi (Wigner RCP)20/09/2023, 11:40
Our department is currently participating in several leading international space research projects to study and analyze in situ measurements taken in the solar wind and in the vicinity of various solar system objects. Our expertise reaches back to the 1980's, when our collaboration with the international space agencies first began. Ever since then we have been active in the scientific data...
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Herwig Ott (Technical University of Kaiserslautern)20/09/2023, 13:50
Driven-dissipative systems are characterized by the appearance of steady-states. Upon parameter change, they can undergo dissipative phase transitions between different types of steady-states. One of the paradigmatic examples for a first order dissipative phase transition is the driven nonlinear single-mode optical resonator. I will report on the corresponding realization within an ultracold...
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András Vukics (Wigner RCP)20/09/2023, 14:30
I present the relatively recent concept of first-order dissipative phase transitions that can occur in meso- and even microscopic quantum systems. One of the first examples of this phenomenology was the photon-blockade breakdown (PBB) effect, that occurs most simply in a coupled system of a bosonic mode and a qubit. For PBB, an abstract thermodynamic limit has been identified [1], where the...
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Anton Pershin (University of Oxford)20/09/2023, 14:50
Nitrogen-vacancy (NV) centers in diamond enable a variety of sensing applications ranging from measuring basic properties, such as temperature, pressure, strain, and external fields, down to detecting single cells, single molecules, or even single nuclear spins. Here, we present new opportunities for quantum sensing with shallow NV centers, i.e. located within 10 nm from the surface. First, we...
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Tamás Bíró (Wigner RCP)20/09/2023, 15:40
The recent revolution of lasers with increased power and shorter pulse length opens new possibilities for fusion energy research. The existence of detonations with time-like normal on space-time hyper-surfaces [1] combined with absorption adjustment using nanoantennas, allows for igniting the target in an opposing laser beam setup [2,3], avoiding instabilities. We describe both theoretical...
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Antal Jakovác (Wigner RCP)20/09/2023, 16:20
Although artificial intelligence (AI) methods are developing rapidly, there are fields, where the improvement seems to be less dynamic. It is crucial to understand the reason of this difference, and try to work out methods which can help to overcome the obstacles. To achieve this goal we shall use the approach of the generalized scientific method, in particular which is used in understanding...
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Gergő Orbán (Wigner RCP)20/09/2023, 16:40
Recently, ambitious goals have been phrased on how technology can boost or heal brain function, focussing on concerted hardware developments. In this talk I will present how developments in Artificial Intelligence research enables us to gain deeper insight into how neurons contribute to cognitive functions.
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Konstantinos Spyrou (University of Ioannina)
Here we report an extended study for the creation of smart porous nanomaterials, including all three porosity regimes (micro-meso and macro porosity) via 3 distinct (and tunable) templating strategies. The idea is to synthesize a novel multi-modal porous scaffold with high surface areas where the hierarchical porosity would provide a vascular and open network of porosity. To achieve this we...
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Gleb Arutyunov (University of Hamburg)
Some problems of integrable Quantum Field Theories
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