Events
Physics Colloquium
Imaging quantum materials with scanning SQUID microscopy
Beena Kalisky
Bar-Ilan University
Tue, 29 Nov 2022, 15:15
Ilse Katz Institute for Nanoscale Science & Technology (51), room 015
Abstract: Competition or cooperation between different electronic orders with similar energy scales often gives rise to new or unexpected behaviors. Detecting traces of such orders requires versatile probes, which can probe different aspects of the system, such as conductivity, superconductivity and magnetism. In my talk, I will describe two systems where our local view uncovered surprising mesoscopic effects. In the oxide interface LaAlO3/SrTiO3, we imaged the current flow close to a metal-insulator transition. We found that the critical behavior is controlled by structural domain patterns in the substrate, rather than by universal scaling laws. In the transition metal dichalcogenide 4Hb-TaS2 we show that the superconducting state hosts a spontaneous vortex phase, where vortices appear in the absence of an external field. I will show evidence that this spontaneous vortex phase is caused by unconventional magnetism in the normal state.
*** Refreshments will be served from 15:00 ***
Astrophysics and Cosmology Seminar
Non-linear propagation effects in Fast Radio Bursts
Dr. Emanuele Sobacchi
HUJI
Wed, 30 Nov 2022, 11:10
Sacta-Rashi Building for Physics (54), room 207
Abstract: The discovery of Fast Radio Bursts (FRBs), bright flashes of millisecond duration, has been a major breakthrough in radio astronomy. Sufficiently close to the engine, electrons in the field of the FRB electromagnetic wave oscillate with relativistic velocities. In this regime, the propagation of the FRB wave is subject to non-linear effects, including induced Compton scattering, induced Raman scattering, and modulation/filamentation instabilities. I will focus on modulation/filamentation instabilities, and discuss their imprint on the spectral and temporal properties of FRBs.
Quantum optics seminar
Quantum computing: a modest overview of IBM Quantum's latest and greatest and the IBM Israel group
Mr. Eli Arbel
IBM
Wed, 30 Nov 2022, 15:00
ZOOM only
Abstract: Zoom link: https://us02web.zoom.us/j/88992366466
Abstract:
In 2016 IBM has put the first quantum processor on the cloud, making it available for everyone to access and run experiments on. This milestone required months of cross-team and cross-continent collaboration to realize, pulling together scientists and engineers from various disciplines and backgrounds. Today IBM Quantum offers a full-stack quantum computing ecosystem which includes dozens of quantum processors, open-source SDK to work with and a rich set of tools and utilities to enable running experiments and conducting research on and with the quantum devices.
In this talk I will give an overview of the of the main capabilities IBM Quantum makes available for users and researchers and will describe the focus areas the IBM quantum computing team in Israel is focusing on.
Physics Colloquium
Ramp Reversal Memory – a new kind of memory in correlated Oxides
Amos Sharoni
Bar-Ilan University
Tue, 06 Dec 2022, 15:15
Ilse Katz Institute for Nanoscale Science & Technology (51), room 015
Abstract: The ramp reversal memory (RRM) [1] is a non-volatile memory effect we discovered in correlated oxides with temperature-driven insulator-metal transitions (IMT), such as VO2, V2O3 and NdNiO3. The memory appears as a resistance increase at predefined temperatures that are set or erased by simple heating-cooling (i.e., ramp-reversal) protocols. The characteristics of this memory effect do not coincide with any previously reported history or memory effects in similar systems.
I will review the broad range of experimental features of the RRM, and numerical modelling performed. From these we conclude that the main ingredients for the effect to arise are the spatial phase-separation of metallic and insulating regions during the IMT and the coupling of local strain to the critical temperature of the phase transition, resulting in a localized increase of the transition temperature along phase boundaries [2]. Similar memory effects are predicted to arise in other materials that possess these rather common ingredients.
[1] Adv. Mater. 2017, 29, 1605029
[2] Phys. Rev. B https://journals.aps.org/prb/accepted/ff07cO36G9f1da47d59d10e8c37797349f10b1b59
*** Refreshments will be served from 15:00 ***
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