English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We generalize a proposal by Sorensen et al. [Phys. Rev. Lett. 94, 086803(2005)] for creating an artificial magnetic field in a cold atom system on asquare optical lattice. This leads us to an effective lattice model withtunable spatially periodic modulation of the artificial magnetic field and thehopping amplitude. When there is an average flux of half a flux quantum perplaquette the spectrum of low-energy excitations can be described by masslessDirac fermions in which the usually doubly degenerate Dirac cones split intocones with different "speeds of light" which can be tuned to give a singleDirac cone and a flat band. These gapless birefringent Dirac fermions arisebecause of broken chiral symmetry in the kinetic energy term of the effectivelow energy Hamiltonian. We characterize the effects of various perturbations tothe low-energy spectrum, including staggered potentials, interactions, anddomain wall topological defects.

Birefringent break up of Dirac fermions in a square optical lattice