Emergent bosons in the fermionic two-leg flux ladder
Abstract
We study the emergence of bosonic pairs in a system of two coupled one-dimensional fermionic chains subject to a gauge flux (two-leg flux ladder), with both attractive and repulsive interaction. In the presence of strong attractive nearest-neighbor interaction and repulsive next-to-nearest-neighbor interaction, the system crosses into a regime in which fermions form tightly bound pairs, which behave as bosonic entities. By means of numerical simulations based on the density-matrix-renormalization-group (DMRG) method, we show in particular that in the strongly paired regime, the gauge flux induces a quantum phase transition of the Ising type from vortex density wave (VDW) to a charge density wave (CDW), characteristic of bosonic systems.
Cite
@article{arxiv.1908.02495,
title = {Emergent bosons in the fermionic two-leg flux ladder},
author = {Marcello Calvanese Strinati and Richard Berkovits and Efrat Shimshoni},
journal= {arXiv preprint arXiv:1908.02495},
year = {2020}
}
Comments
9 pages, 16 figures. Updated version after publication in Phys. Rev. B