Stripes, topological order, and deconfinement in a planar t-Jz model

Details Stripes, topological order, and deconfinement in a planar t-Jz model Stripes, topological order, and deconfinement in a planar t-Jz model

2003-09-10

arxiv.org/abs/cond-mat/0309249v2

Phys. Rev. Lett. 93, 067201 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures (2 in color). Final version

Scientific paper

10.1103/PhysRevLett.93.067201

We determine the quantum phase diagram of a two-dimensional bosonic t-Jz model as a function of the lattice anisotropy gamma, using a quantum Monte Carlo loop algorithm. We show analytically that the low-energy sectors of the bosonic and the fermionic t-Jz models become equivalent in the limit of small gamma. In this limit, the ground state represents a static stripe phase characterized by a non-zero value of a topological order parameter. This phase remains up to intermediate values of gamma, where there is a quantum phase transition to a phase-segregated state or a homogeneous superfluid with dynamic stripe fluctuations depending on the ratio Jz/t.

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