Leiden University
Colloquium Ehrenfestii 2017


COLLOQUIUM EHRENFESTII 2017

initiated by Paul Ehrenfest in 1912
currently organized by Ana Achúcarro & Luca Giomi (read about its history)


Meal reservation form

13 December

Jörg Schmalian (Karlsruhe)

Hydrodynamics in isotropic and anisotropic Dirac systems

Hydrodynamics describes a great variety of phenomena around and inside us, including, e.g., the flow of water in rivers, seas, and oceans, the atmospheric phenomena, the motion of aircrafts, the flow of petroleum in pipelines, or the blood flow through human vessels. It has been realized a long ago that a current of electrons in a conductor should, under certain circumstances, also obey laws of hydrodynamics and that electrons can show a Poiseuille-type flow analogous to that of liquids in pipes. Recently several experiments made significant progress to demonstrate the corresponding power-law increase of conductivity with the transverse cross-section of a sample. In this talk we will discuss the hydrodynamic behavior that is unique to Dirac systems. First, we will discuss graphene as example and focus on the distinction between information scrambling and thermalization on the one hand and hydrodynamics on the other hand. In addition, we will discuss anisotropic Dirac systems. Here we find a strong violation of the bound, conjectured for the ratio of the viscosity and entropy ratio. We demonstrate that such systems give rise to anisotropic thermal Poiseuille flow and offer a generalization of the above bund for anisotropic systems.


The Colloquium Ehrenfestii takes place Wednesday evenings starting at 19:30 hours in the main auditorium of the Oort building. Before the Colloquium, there is a common dinner in the canteen located on the ground floor of the Oort building. This dinner starts at 18:00 hours sharp and is free of charge, under the condition that one attends the colloquium and that one has made a reservation before noon on the Tuesday preceding the colloquium. [Registration may close earlier, when 80 persons have signed up]

Colloquium Ehrenfestii 2017

1 Feb

Leo Radzihovsky (Boulder)

Chiral symmetry breaking, emergent Higgs mechanism, and critical matter

15 Feb

Yossi Avron (Technion)

The geometry of non-dissipative transport: From conductance to viscosity

1 Mar

Oleg Lavrentovich (Kent State)

Dynamics of colloids in liquid crystals

8 Mar

Anne Davis (Cambridge)

The accelerating Universe

5 Apr

Jacques Prost (Curie Institute)

Long-time tissue dynamics and multicellular spheroids

19 Apr

Cristina Marchetti (Syracuse)

Active Matter: from colloids to living cells

10 May

Michael Berry (Bristol)

Variations on a theme of Aharonov and Bohm

31 May

Julia Yeomans (Oxford)

Topology in biology

14 Jun

Renata Kallosh (Lorentz Professor)

From Planck to Escher

27 Sep

Sriram Ramaswamy (Indian Institute of Science, Bangalore)

Living and Driven Matter

15 Nov

Frank Jülicher (Max Planck Inst., Dresden)

Symmetry breaking of biological cells

29 Nov

Jeroen van den Brink (IFW Dresden)

The axion electromagnetic response of topological insulators

13 Dec

Jörg Schmalian (Karlsruhe)

Hydrodynamics in isotropic and anisotropic Dirac systems

17 Jan

Dirk Morr (Chicago)

TBA

7 Feb

Ed Copeland (Nottingham)

TBA

18 Apr

Stefan Maier (Imperial College, London)

TBA

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