A theoretical analysis of the Peltier effect in two-dimensional quantum poi
nt contacts, in field-free conditions and under the influence of applied ma
gnetic fields, is presented. It is shown that in the nonlinear regime (fini
te applied voltage) new peaks in the Peltier coefficient appear leading to
violation of Onsager's relation. Oscillations of the Peltier coefficient in
a magnetic field are demonstrated. (C) 1998 Published by Elsevier Science
Ltd. All rights reserved.