CMSP seminars coming up today 11:30 a.m. and thursday

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Contents:

    1. CMSP seminars  coming up today and thursday
       (Cond.Matt. & Stat.Mech.Section)


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From: "Cond.Matt. & Stat.Mech.Section" <cm at ictp.it>
Subject: CMSP seminars  coming up tomorrow and thursday



JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR

   Tuesday, 28 May   -   11:30 a.m.


Giambiagi Lecture Hall, Adriatico Guesthouse - lower level


Silvio FRANZ   ( LPTMS - Orsay )



"Boltzmann pseudodynamics for  spin glasses and liquids"



Abstract

  More than 10 years ago, it was realized that mean field glassy 
dynamics, with the emergence of aging and effective temperatures, can be 
understood as quasi-equilibrium exploration of configuration space. The 
formalization of this notion, only recently proposed, defines a Markov 
chain where short times are coarse grained, and subsequent 
configurations are chosen according to a constrained Boltzmann distribution.

In mean field spin glasses, this pseudodynamic rule admits, in the long 
time limit, a description leading to glassy solutions identical to the 
ones corresponding to real (Langevin) dynamics. The treatment of the 
pseudodynamics through replicas unveils a longly suspected relation 
between replicas and the supersymmetry of the Langevin equation.

The application of the formalism to liquids avoids the difficulties 
related to short time conservation laws, and allows to use equilibrium 
approximation schemes of liquid theory to study long time dynamics. The 
scheme is applied to a closure scheme of hierarchical equations recently 
proposed by Szamel and to liquids in the hypernetted chain (HNC) 
approximation. It is shown that the former case leads to the standard 
Mode Coupling Theory (MCT) equations of G?tze, thus giving an 
interpretation of it. The second case also gives rise to MCT-like 
equations, but in a framework where, differently from MCT that requires 
the input of equilibrium structure factors, static equilibrium and 
dynamical quantities are computed in a unified consistent framework.

Refs. SF and G. Parisi, JSTAT P02003 (2013), SF, G. Parisi and P. 
Urbani, arXiv:1212.4291



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SEMINAR on    Disorder and strong electron correlations


Thursday, 30 May  -  11:30 a.m.


Luigi Stasi Seminar Room,  Leonardo Building - first floor


Michael SCHUETT    (Karlsruhe Institute of Technology)



"Hall-drag and magneto-drag in  graphene via kinetic equation approach"


Abstract

  Recently, Coulomb drag measurements have been performed in graphene, 
usually in the presence of magnetic fields as well.  In this work we 
calculate the magneto-drag and the Hall-drag resistivity at finite 
temperature for two graphene monolayers by solving the quantum kinetic 
equation.  The presented theory is valid in the hydrodynamic regime, 
which is dominated by inelastic scattering. The microscopic formulation 
supports a phenomenological Drude-like picture which for large 
concentrations equals the usual Drude form, and for small concentration 
an effective two-band-Drude equation.  Our theory allows for a 
qualitative description for arbitrary chemical potentials.  An emphasis 
is put on the Hall-drag which is absent when derived from the standard 
Drude equation.  We show that the Hall-drag vanishes along the line of 
opposite carrier concentration in the layers, but we also identify non 
trivial concentrations at which the Hall-drag vanishes.