University of Toronto
Physics Department
Quantum Optics and Condensed Matter
SPECIAL SEMINAR

Speaker :	DR. ROBERT KONIK Department of Physics University of Virginia Charlottesville
Topic :	TRANSPORT IN HALDANE-GAP SPIN CHAINS AT FINITE TEMPERATURE AND FINITE MAGNETIC FIELDS
Time :	Tuesday, March 20, 2001 at 10:00 a.m.
Place :	Room MP134, Burton Tower, 60 St. George Street / 255 Huron Street

PLEASE NOTE:  NON-STANDARD DAY, TIME AND ROOM

Abstract:

I study the dynamic properties of gapped one dimensional Heisenberg anti-ferromagnetic spin chains at finite temperature and finite applied magnetic field through an analysis of the O(3) non-linear sigma model.  I will demonstrate how the exact solvability of this model can be exploited in a novel way to extract the relevant physics.  One question which I am then able to address is the presence or absence of spin diffusion in Haldane-gap spin chains, a question of current controversy.  Another question I consider is the behaviour of these chains in the presence of an applied magnetic field exceeding the gap.  In this case, the spin chain sees an emergent Luttinger liquid behaviour which can be described precisely.
 
 

Local Host: Professor Allan Griffin   (416-978-5199)

See   http://www.physics.utoronto.ca/~qocmp
 
 
 

CANDIDATE FOR FACULTY POSITION IN THEORETICAL CONDENSED MATTER PHYSICS