Realising Type II Weyl Points in an Optical Lattice

Abstract

The recent discovery of the Lorentz symmetry-violating 'Type II' Weyl semimetal phase has renewed interest in the study of Weyl physics in condensed matter systems. However, tuning the exceptional properties of this novel state has remained a challenge. Optical lattices, created using standing laser beams, provide a convenient platform to tune tunnelling parameters continuously in time. In this paper, we propose a generalised two level system exhibiting type II Weyl points that can be realised using ultra-cold atoms in an optical lattice. The system is engineered using a three-dimensional lattice with complex $\pi$ phase tunnelling amplitudes. Various unique properties of the type II Weyl semimetal such as open Fermi surface, anomalous chirality and topological Fermi arcs can be probed using the proposed optical lattice scheme.

arXiv comment5 pages, 4 figures

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Cited by in corpus (9)

• Topological quantum matter with cold atoms
• Type-II Dirac photons at the metasurfaces
• Exploring topological double-Weyl semimetals with cold atoms in optical lattices
• Dissipation-induced topological transitions in continuous Weyl materials
• Chiral magnetic effect in three-dimensional optical lattices
• Generalized Hofstadter model on a cubic optical lattice: From nodal bands to the three-dimensional quantum Hall effect
• Topological metal bands with double-triple-point fermions in optical lattices
• Observation of Single Pair of Type-III Weyl Points in Sonic Crystals
• Topological van Hove singularities at phase transitions in Weyl metals