Events
Condensed Matter Seminar
A self-consistent theory of localisation in quasiperiodic chains
Dr. Alexander James Duthie
BGU
Mon, 23 May 2022, 11:30
Sacta-Rashi Building for Physics (54), room 207
Abstract: We introduce a self-consistent theory of mobility edges in nearest-neighbour tight-binding chains with quasiperiodic potentials. Demarcating boundaries between localised and extended states in the space of system parameters and energy, mobility edges are generic in quasiperiodic systems which lack the energy-independent self-duality of the commonly studied Aubry-André-Harper model. The potentials in such systems are strongly and infinite-range correlated, reflecting their deterministic nature and rendering the problem distinct from that of disordered systems. Importantly, the underlying theoretical framework introduced is model-independent, thus allowing analytical extraction of mobility edge trajectories for arbitrary quasiperiodic systems.
Particles and Fields Seminar
The FASER experiment at the LHC
Enrique Kajomovitz
Technion
Mon, 23 May 2022, 14:00
Sacta-Rashi Building for Physics (54), room 207
Abstract: The FASER experiment at the LHC, is a small experiment aiming at new (BSM) feebly interacting long lived particles. The experiment's detector is located at approximately 500mts in line of sight of the ATLAS interaction point. It is designed to take advantage of the enormous flux of light hadrons in the direction of the LHC beam produced at the LHC collisions. In the talk I will discuss the physics case and the status of the experiment (which will begin collecting LHC Run-3 in a few months)
Physics Colloquium
Quantum gas in a box
Zoran Hadzibabic
Cambridge University
Mon, 23 May 2022, 16:00
Zoom
Abstract: For nearly three decades ultracold atomic gases have been used with great success to study fundamental many-body phenomena such as Bose-Einstein condensation and superfluidity. While traditionally they were produced in harmonic electromagnetic traps and thus had inhomogeneous densities, it is now also possible to create homogeneous samples in the uniform potential of an optical box trap [1]. Box trapping simplifies the interpretation of experimental results, provides more direct connections with theory and, in some cases, allows qualitatively new, hitherto impossible experiments [2]. I will give an overview of our recent experiments with box-trapped three- and two-dimensional Bose gases, focusing on a series of related experiments on non-equilibrium phenomena, including phase-transition dynamics [3], turbulence [4-7], and equilibration of closed quantum systems [8].
[1] Bose-Einstein condensation of atoms in a uniform potential, A. L. Gaunt et al., Phys. Rev. Lett. 110, 200406 (2013).
[2] Quantum gases in optical boxes (review), N. Navon, R. P. Smith, and Z. Hadzibabic, Nat. Phys. 17, 1334 (2021).
[3] Critical dynamics of spontaneous symmetry breaking in a homogeneous Bose gas, N. Navon, A. L. Gaunt, R. P. Smith, and Z. Hadzibabic, Science 347, 167 (2015).
[4] Emergence of a turbulent cascade in a quantum gas, N. Navon, A. L. Gaunt, R. P. Smith, and Z. Hadzibabic, Nature 539, 72 (2016).
[5] Synthetic dissipation and cascade fluxes in a turbulent quantum gas, N. Navon et al., Science 366, 382 (2019).
[6] Emergence of isotropy and dynamic scaling in two-dimensional turbulence, M. Galka et al., arXiv:2203.09514 (2022).
[7] Equation of state for a turbulent quantum gas, L. H. Dogra et al., in preparation (2022).
[8] Bidirectional dynamic scaling in an isolated Bose gas far from equilibrium, J. A. P. Glidden et al., Nat. Phys. 17, 457 (2021).
*** The Zoom link will be sent to all the department members on the day of the event. ***
*** This colloquium is joint with all the universities in Israel. We invite you to log in at 16:00 for socializing. The talk itself will start at 16:10. ***
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