Berlin 2015 – wissenschaftliches Programm
TT 71.27: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
The phase diagram of the XXZ model on the anisotropic triangular lattice — •Shijie Hu1, Jize Zhao2,3, Xuefeng Zhang1, and Sebastian Eggert1 — 1Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Institute of Applied Physics and Computational Mathematics, Beijing 100088, China — 3Beijing Computational Science Research Center, Beijing 100084, China
We use the density-matrix renormalization group (DMRG) in two dimensions to systematically study the full phase diagram of a general antiferromagnetic XXZ model on the anisotropic triangular lattice (called Jz-Jx-J′z-J′x model). In the strong-coupling limit of large Jz/Jx, we find a broad incommensurate supersolid phase in between the 1/2 filled Néel phase and 1D-decoupled-chain phase as a function of anisotropy. The incommensurate vector of this coplanar phase is related to the quantized density of domain walls along the vertical axis. In the other limit of large Jx/Jz, we find an incommensurate superfluid phase (cone phase). The transition region from supersolid phase to superfluid phase for intermediate coupling strength Jz/Jx, shows a rich physical behavior and provides a hint about the existence of a gapped ’spin-liquid’ phase proposed by P. W. Anderson several decades ago.