Next week's seminars

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION
	
Joint ICTP/Democritos

INFORMAL SEMINAR on Chemical Physics




Tuesday, 16 May   -    2:00 p.m.




Room 239  Main Bldg.- II floor



M. KRISCH   ( European Synchrotron Radiation Facility, Grenoble )



" Inelastic X-ray scattering from phonons at high pressure "


Abstract

Since the first pioneering experiments in the late 1980’s, inelastic 
X-ray scattering (IXS) with meV energy resolution has evolved rapidly 
into a valuable spectroscopic tool to study phonon dispersion in a 
large variety of materials.  IXS is particularly well suited for 
disordered systems, samples only available in small quantities, or 
materials studied under very high pressure.  Thanks to the outstanding 
brilliance of third generation synchrotron sources and performing 
focusing X-ray optics, phonon studies to 50 GPa and beyond are nowadays 
routinely performed.  The present capabilities of IXS shall be 
illustrated by selected examples of high-pressure work.

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CONDENSED MATTER AND STATISTICAL PHYSICS SECTION
	
INFORMAL SEMINAR on

Disorder and strong electron correlations






Thursday, 18 May    -    11:00 a.m.




Room 239,  Main Bldg.- II floor




M. KISELEV   ( University of Würzburg )




"The interplay of spin and charge channels in zero dimensional system"


Abstract


We consider the interplay of the charge and spin zero-mode interactions 
in quantum dots.  The non-perturbative effects of zero-mode interaction 
are described in terms of the propagation of gauge bosons associated 
with charge (U(1)) and spin  (SU(2)) fluctuations in the dot.  The 
Coulomb and longitudinal spin components are accounted for exactly, 
while transverse spin fluctuations are studied perturbatively (with  
the easy-axis anisotropy).  These fluctuations become important as one 
approaches the Stoner instability.  We study the influence of spin on 
the differential conductance as well as the dynamic spin 
susceptibility.