Seminars

• Special seminar

  Exploring New Horizons in Complex Oxide Quantum Heterostructures through Stacking and Twisting

  Nini Pryds, Department of Energy Conversion and Storage, Technical University of Denmark

  30 Oct 2025, 11:00 Ilse Katz Institute for Nanoscale Science & Technology (51), room 015

Astrophysics and Cosmology

Space Weather

Michael Gedalin

The Sun governs the life of the Earth. Solar-terrestrial relations occur not only via radiation coming to the Earth but also via time-varying plasma flow. This solar wind is decelerated and diverted by the bow shock forming at the distance of about 10 Earth radii toward the Sun. The diverted plasma flows around the Earth, shaping a magnetosphere with a long tail and a current sheet where the so called "magnetic reconnection" (see movie) occurs, causing magnetic substorms. We study the basic processes in this interaction.

Condensed Matter Experimental

Noise in strongly correlated systems

Grzegorz Jung

Normalized spectral density and R(T) for distinct resistivity states

To many physicist the subject of fluctuations appears esoteric and even pointless; spontaneous fluctuations seem nothing but an unwanted evil which only an unwise experimenter would encounter. In reality, noise enables a deep insight into physics of the system. Recently, we have employed noise to discriminate various resistivity states in the ferromagnetic insulating manganite La0.86Ca0.14MnO3. Different states arise due to transitions between local minima of the electronic glass potential landscape. Remarkably, freezing into the glass state is marked by the onset of non-Gaussian noise.

Seminars

• Special seminar

  Exploring New Horizons in Complex Oxide Quantum Heterostructures through Stacking and Twisting

  Nini Pryds, Department of Energy Conversion and Storage, Technical University of Denmark

  30 Oct 2025, 11:00 Ilse Katz Institute for Nanoscale Science & Technology (51), room 015

Biological and Soft Matter Physics

Soft Matter Physics and Renewable Energy

Arik Yochelis

Most renewable energy devices exploit nano-scale morphologies that are paramount to large surface area, required to increase activity. However, electrical effects are often strong enough to influence the structure of active layers of those materials leading to a notorious decrease in performance. To date, theoretical studies have dealt almost exclusively with uncoupled models of self-assembly and electrokinetics. We develop novel and computationally amenable mean-field frameworks that do unify them. Our expectations are to advance devices, such as batteries, supercapacitors, and solar cells.

Atomic, Molecular and Optical Physics

Quantum Cheshire Cat

Daniel Rohrlich

If D1 clicks, then intermediate measurements find the Cat (photon) in |L> while its grin (polarization) is nonzero only in |R>.

Y. Aharonov, S. Popescu, D. Rohrlich and P. Skrzypczyk, "Quantum Cheshire Cats", New J. Phys. 15 (2013) 113015. We present a quantum Cheshire Cat. Weak measurements on a pre- and post-selected ensemble find the Cat in one place and its grin in another. The Cat could be a photon, with circular polarization as its quantum "grin" state. But see T. Denkmayr et al., "Observation of a quantum Cheshire Cat in a matter-wave interferometer experiment", Nat. Comm. 5, 4492 (2014); they send neutrons through a silicon crystal interferometer, while weakly probing their locations and magnetic moments. The results suggest that the neutrons go along one beam path while magnetic moments go along the other.

Seminars

• Special seminar

  Exploring New Horizons in Complex Oxide Quantum Heterostructures through Stacking and Twisting

  Nini Pryds, Department of Energy Conversion and Storage, Technical University of Denmark

  30 Oct 2025, 11:00 Ilse Katz Institute for Nanoscale Science & Technology (51), room 015

High-Energy Physics

QCD at High Energies

Michael Lublinsky

Different resolution of the proton structure as probed by virtual photons in ep collisions.

We have entered the fascinating era of the Large Hadron Collider. The microscopic theory describing the structure of protons and nuclei is the theory of strong interactions, known as Quantum ChromoDynamics (QCD). Even though the fundamental theory is known, it is extremely difficult to deduce results of collision processes from first principle QCD calculations. This is due to complexity of the theory involving mutual interactions between gluons, the "photons" of strong interactions.

Condensed Matter Theory

Spin related mesoscopics

Amnon Aharony

*** Quantum mechanics of nanometer sized devices: using electron wave interference to manipulate electron motion. *** Spintronics: taking advantage of the electron’s magnetic moment (spin), and not only of its charge, to store and read information. Possible applications in quantum computers. *** Multiferroic materials are both magnetic and ferroelectric, and therefore can be manipulated by both electric and magnetic fields.