at ANU (Australia National University), Canberra, Australia, December 11th

at Melbourne University, Melbourne, Australia, December 17th

at Monash University, Melbourne, Australia, December 19th

Abstract: In this talk, I will present an argument as well as numerical evidence that the 4-state Potts antiferromagnet has a finite-temperature phase transition on any Eulerian plane triangulation in which one sublattice consists of vertices of degree 4, and exhibit infinite families of two-dimensional lattices on which the q-state Potts antiferromagnet has a finite-temperature phase transition at arbitrarily large values of q. Moreover, we find that the 3-state Potts antiferromagnet has a zero-temperature critical point on a quadrangulation of self-dual type and has a finite-temperature phase transition on a quadrangulation of non-self-dual type.

at Inaugural ANZAMP (Australian and New Zealand Association of Mathematical Physics) Annual Meeting 2012, Lorne, Australia, December 4th

at KITPC program "Critical behavior of lattice models in atomic and molecular, condensed matter and particle", Beijing, China, August 8th

Abstract: I will discuss the general scheme of the diagrammatic Monte Carlo method for correlated fermion system, and then discuss its application to the Fermi-Hubbard model.

invited talk at "The 17th national meeting on condensed matter theory and statistical physics (第17届全国凝聚态理论与统计物理学术会议)", Lanzhou, China, July 24th

Abstract: The lecture will introduce recent progresses on statistical-mechanical models with antiferromagnetic interaction on the union-jack lattice, including the q-state Potts model, the XY antiferromagnet, and the hard-core Bose-Hubbard model. In comparison with the triangular lattice, the combined effect of geometric frustration and non-equivalence of sublattices yields rich phase diagrams and interesting low-temperature properties, including entropy-driven and recursive phase transitions as well as the coexistence of quasi-long-range spin order and chiral order etc. Some exact transformations will be also mentioned.

at Shanghai Jiao-Tong Univ. (致远学院), Shanghai, China, March 22nd

Abstract: In this talk, I will describe the worm Monte Carlo algorithm in the framework of the Ising model. Then, I will briefly introduce how the worm algorithm can be applied to quantum bosonic and spin systems. Last but not least, the idea of diagrammatic Monte Carlo method based on worm-types updates is mentioned.