DMRG Study of the Striped Phase in the 2D t-J model

TL;DR

This paper uses DMRG to investigate the 2D t-J model, revealing a striped phase at specific doping levels that aligns with experimental observations, and suggests stripe fluctuations due to near-degenerate energies.

Contribution

It demonstrates the presence of stripe phases in the 2D t-J model using large-scale DMRG calculations, highlighting the near degeneracy of bond-centered and site-centered stripes.

Findings

Stripe phase consistent with neutron scattering

Bond-centered and site-centered stripes nearly degenerate

Stripe domain walls can fluctuate without pinning effects

Abstract

Using the density matrix renormalization group (DMRG), we study the 2D t-J model at a hole doping of x=1/8 on clusters as large as 19x8. We find a striped phase which is consistent with recent neutron scattering experiments. We find that bond-centered and site-centered stripes have nearly the same energy, suggesting that in the absence of pinning effects the domain walls can fluctuate.