4 papers
Criticality around the Spinodal Point of First-Order Quantum Phase Transitions
Fan Zhang, Chiao Wang, H. T. Quan
Universality and scaling are hallmarks of second-order phase transitions but are generally unexpected in first-order quantum phase transitions (FOQPTs). We present a microscopic th…
Phase diagrams of S=1/2 bilayer Models of SU(2) symmetric antiferromagnets
Fan Zhang, Nisheeta Desai, Wenan Guo +1
We study the phase diagrams of models of bilayers of square lattices antiferromagnets with SU(2) Heisenberg symmetry that have 2, 4, and 6 spin exchanges. We study tw…
First-order Néel-VBS transition in antiferromagnets
Fan Zhang, Wenan Guo, Ribhu K. Kaul
We study the transition between Néel and columnar valence-bond solid ordering in two-dimensional square lattice quantum antiferromagnets with SO(3) symmetry. According to t…
Phase diagram of a square lattice model of XY Spins with direction-dependent interactions
Fan Zhang, Wenan Guo, Ribhu K. Kaul
We study a generalization of the well-known classical two-dimensional square lattice compass model of XY spins (sometimes referred to as the 90 compass model), which interp…