For distribution - tks

[CM ICTP - Trieste]

SEMINAR on  Disorder and strong electron correlations




Thursday, 26 April   -    4:00 p.m.



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



V. PELLEGRINI  (NEST INFM-CNR and Scuola Normale Superiore, Pisa )



" Shining light on correlated electrons in low-dimensional 
semiconductors"


Abstract

	The low-dimensional electron systems that reside in artificial 
semiconductor heterostructures of great perfection are a contemporary 
materials base for explorations of collective phenomena and quantum 
phase transitions.  Studies of low-lying elementary excitations by 
inelastic light scattering offer insights on properties such energetic, 
interactions and spin magnetization.  We review here recent light 
scattering results obtained from two-dimensional (2D) quantum fluids in 
semiconductor heterostructures under extreme conditions of low 
temperature and large magnetic field, where the quantum Hall phases are 
archetypes of novel behaviors.  We also consider recent light 
scattering experiments that have probed the excitation spectra of 
few-electron states in semiconductor quantum dots.