Condensed Matter Physics

Name	Category	Phone	Office
Bettelheim Eldad	Faculty	02 6585 148	Danciger B 204
Biham Ofer	Faculty	02 6584 363	Danciger B 210
Brada Yohanan	Emeriti		Danciger B
Caplan Yosef	Graduate Students	02 6586 707	Danciger B 225
Davidov Dan	Emeriti	02 6584 637	Danciger B 106
Dimanstein Noya	Graduate Students		Popick Bldg.
Dvir Tom	Graduate Students	02 6594 031	Kaplun Bldg.
Engelberg Eli	Graduate Students		Popick Bldg.
Farfurnik Demitry	Graduate Students	02 6584 441	Bergman Bldg.
Felner Israel	Emeriti	02 6585 752	Kaplun 22

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Upcoming Events

Tomorrow

Physics Colloquium : "Deep Learning: Some Perspectives from Physics"
- Start time: 12:00pm
- End date: Monday, January 20th
- End time: 01:30pm
- Lecturer: Zohar Ringler, HUJIAbstract:Though no match to practical breakthroughs, our theoretical grasp of deep learning has steadily widened during the last decade. This talk will review the past misconceptions and recent new conceptions that have formed, taking a physics standpoint. In particular, I will describe some concrete links to entropy, order by disorder, field theory, and renormalization. I will also discuss the paradoxical nature of trying to understand models meant to solve problems we cannot solve analytically, and ways around this.
- View this event in Google Calendar

Tuesday, January 21st

Astrolunch: Amiel Sternberg
- Start time: 12:30pm
- End date: Tuesday, January 21st
- End time: 01:30pm
- Speaker: Amiel Sternberg (Tel Aviv University, Israel. Flatiron Institute, USA)
  
  Title: Thermal Sunyaev-Zeldovich Effect in the Circumgalactic Medium of L* Galaxies
  
  Abstract: I will describe our recent paper Oren+ 2024 ApJ 974 291 in which we analyze recent
  observations of the the thermal Sunyaev-Zeldovich (tSZ) effect arising in the circumgalactic medium (CGM)
  of L* galaxies. We make use of analytic models and simulations. The observations imply steep radial electron
  pressure profiles, with baryon fractions exceeding half the cosmic values expected for the dark-matter halos.
  An isentropic equation of state is favored over an isothermal CGM gas distribution. The tSZ signals are
  broadly consistent with hot-gas high-ionization metal absorbers such as OVI. The Illustris TNG100 simulation
  underpredicts the observed tSZ strengths suggesting that the simulation is ejecting too much gas from
  the galaxy halos.
  
  Contact: Zhaozhou Li
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Wednesday, January 22nd

Nonlinear Physics seminar: "Hall effect and Manning-Oosawa-like condensation in flowing electrolytes in magnetic fields"
- Start time: 12:00pm
- End date: Wednesday, January 22nd
- End time: 01:30pm
- Lecturer: Prof. Yoav Tsori, Ben-Gurion University in the Negev Abstract:The Hall effect in flowing electrolytes had been speculated and tested just a few years after the discovery of the original effect in 1879. The initial attempts were unsuccessful or controversial. In 1897, Donnan calculated the weak Hall voltage for an electrolyte in uniform magnetic field whose charge carriers are driven by an electric field. In the following decades, theoretical works missed important terms or incorrectly calculated the electric field distribution. Here, we describe the stronger ``Hall effects'' in laminar, one-dimensional, and incompressible flows of electrolytes driven by pressure gradients or moving surfaces. In a steady state, the hydrodynamic stress and Lorentz and entropic forces add to give a vanishing ionic flux. The electrical charge, ion densities, and conductivity are subsequently found from solution of a nonlinear eigenvalue Poisson-Boltzmann equation with an external ``force'' that depends on the hydrodynamic flow profile and magnetic field. For Poiseuille flow in a channel, Hall voltage and other quantities depend continuously the magnetic field. For a fluid in Taylor-Couette flow between coaxial cylinders rotating parallel to a magnetic field, we calculate the electric field and ion distribution and find Manning-Oosawa-like counterion condensation with a renormalized Manning parameter. We then examine a simple Couette flow of a fluid sheared by a charged moving surface in a perpendicular magnetic field. The nonlinear eigenvalue equation has a position-dependent term. Surprisingly, this one-dimensional system has counterion run-off in the limit of infinite width even though the classical Manning-Oosawa condensation occurs only in two dimensions.
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Condensed Matter Physics

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