Online Seminars

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The workshop continues...





Date : 15th of April, 17:00 CET

Link :

Speaker : Carlos Hoyos (University of Oviedo)

Title: Geometry, duality and odd transport in flatland


AbstractEffective theories are very useful to extract transport properties at long wavelengths, which can be done by studying the response to external sources and geometric deformations. In two dimensions one can also take advantage of particle-vortex duality which allows a similar description for Quantum Hall states and superfluids/superconductors using statistical gauge fields. I will discuss the effective theory description of two-dimensional states with broken parity and time-reversal invariance and the relation between odd transport and symmetry and topological properties of the state.



Date : 22nd of April, 17:00 CET

Link : coming soon

Speaker : Jan Zaanen (Instituut-Lorentz and University of Leiden)


Title: Holography in the lab: are the killer aps around the corner?


AbstractDealing with nature, being on the right track may have the effect that out of the blue surprises starts raining down in the laboratory. AdS/CMT may be in such a state. How ARPES disqualified the cuprate quantum critical point proving the presence of holography style strange metal phases. How graphene style nano-transport devices appear to pick up hydrodynamical electron flow in such a strange metal, seemingly implying the governance of the minimal viscosity. How transport properties in the cuprate spin stripes in very large magnetic fields reveal the fingerprints of the “second” quantum critical sector. When time- and co-authors permit, how the same stuff lingers on in the overdoped regime co-existing with an unreasonable Fermi-liquid.



Date : 30th of April, 17:00 CET

Link : coming soon

Speaker : Luca Delacretaz (University of Chicago)


Title: Hydrodynamic Fluctuations


Abstract: TBA





Date : TBA

Link : coming soon

Speaker : Martin Ammon (University of Jena)

Title: Anomalous hydrodynamics and strong external magnetic fields


Abstract: TBA




Date : TBA

Link : coming soon

Speaker : Blaise Goutéraux (École Polytechnique Paris)


Title: Overview and recent developments in the effective field theory description of superfluids


AbstractSuperfluids are one of the hallmarks of 20th century physics. Superfluid phases of matter are typically described at low energies and nonzero temperatures by an effective theory, the Landau-Tisza two-fluid model, which assumes the co-existence of a superfluid, dissipationless flow and a normal, dissipative flow. At zero temperature, the flow becomes entirely superfluid. In this case, a (relativistic) quantum effective action for the Goldstone has been written, and further works have studied finite temperature corrections. Holographic superfluids have also been shown to be described by the Landau-Tisza model, for the most part. I will then move on to explain how holographic superfluids with a Lifshitz-invariant quantum critical IR geometry lead to a non-vanishing normal component at zero temperature, suggesting that these are not described by the universal relativistic quantum effective action mentioned above. I will also explain how this could be relevant for recent measurements of the superfluid density and ac conductivity at low temperatures in overdoped high Tc superconductors.



Date : TBA

Link : coming soon

Speaker : Sebastian Grieninger (University of Jena)


Title: TBA


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