Next week's seminar

[CM ICTP - Trieste]

CONDENSED MATTER AND STATISTICAL PHYSICS SECTION
	
INFORMAL SEMINAR on  Disorder and strong electron correlations




Thursday, 23 November    -    11:00 a.m.



Lecture Room 'C',  Main Bldg.- terrace level




M. PUSTILNIK   ( Georgia Institute of Technology, Atlanta )



"One-dimensional fermions beyond the Luttinger liquid paradigm"


Abstract

In this presentation I will review our recent work on dynamic 
correlations in a system of one-dimensional fermions with a nonlinear 
dispersion.  It turns out that in the presence of interactions the 
nonlinear dispersion results in new universal features in the frequency 
and the wave vector dependence of the dynamic structure factor 
(density-density correlation function). These features are similar in 
origin to the well-known Fermi-edge singularities in the X-ray 
absorption spectra of metals.  Besides being of interest for its own 
sake,  detailed understanding of the structure factor is crucial for 
the description of a variety of transport phenomena that owe their 
existence to the particle-hole asymmetry, such as Coulomb drag, 
thermopower, and photovoltaic effect, as well as for the description of 
inelastic neutron scattering off antiferromagnetic spin chains.