Speaker: Dr. WEI Bobo（Department of Physics, The Chinese University of Hong Kong）

Time: 4:00pm, Thursday, May 9, 2013

Venue: Conference Hall 104, Science Building, Tsinghua University

Abstract:

Utilizing the brilliant solution by Onsager and Kaufman of the two-dimensional (2D) Ising model, a lattice gas model was constructed by Lee and Yang in 1952 for which the two phase region in its p-V diagram is analytically known. In the present work, we construct duplex models which have three phases, not just two, and for which the phase boundary in p-T diagrams and in p-V diagrams can both be exactly calculated. These models have two sublattices, and long range order form separately in the sublattices, creating a kind of partial order.