Electronic properties of strained double-Weyl systems

Abstract

The effects of strains on the low-energy electronic properties of double-Weyl phases are studied in solids and cold-atom optical lattices. The principal finding is that deformations do not couple, in general, to the low-energy effective Hamiltonian as a pseudoelectromagnetic gauge potential. The response of an optical lattice to strains is simpler, but still only one of several strain-induced terms in the corresponding low-energy Hamiltonian can be interpreted as a gauge potential. Most interestingly, the strains can induce a nematic order parameter that splits a double-Weyl node into a pair of Weyl nodes with the unit topological charges. The effects of deformations on the motion of wavepackets in the double-Weyl optical lattice model are studied. It is found that, even in the undeformed lattices, the wavepackets with opposite topological charges can be spatially split. Strains, however, modify their velocities in a very different way and lead to a spin polarization of the wavepackets.

16 pages, 5 multi-panel figures; published version with minor corrections

References in corpus (19)

• The electronic properties of bilayer graphene
• Degenerate Quantum Gases with Spin-Orbit Coupling
• Discovery of Weyl fermion semimetals and topological Fermi arc states
• Manipulating Topological Edge Spins in One-Dimensional Optical Lattice
• Quantum Transport in Topological Semimetals under Magnetic Fields
• Strain induced Chiral Magnetic Effect in Weyl semimetals
• Topologically Protected Zero Modes in Twisted Bilayer Graphene
• Strained bilayer graphene: Band structure topology and Landau level spectrum
• Rotational strain in Weyl semimetals: A continuum approach
• Quantum oscillations without magnetic field
• Constructing a Weyl semimetal by stacking one dimensional topological phases
• Type-II Weyl Points in Three-Dimensional Cold Atom Optical Lattices
• Anomalous transport properties of Dirac and Weyl semimetals
• Exotic topological density waves in cold atomic Rydberg fermions
• Emergent gravity and chiral anomaly in Dirac semimetals in the presence of dislocations
• Tunable axial gauge fields in engineered Weyl semimetals: Semiclassical analysis and optical lattice implementations
• Exploring topological double-Weyl semimetals with cold atoms in optical lattices
• Electronic transport in torsional strained Weyl semimetals
• Coexistence and competition of nematic and gapped states in bilayer graphene

Cited by in corpus (7)

• Pseudo-electromagnetic fields in topological semimetals
• Topological carbon materials: a new perspective
• Generation of strain-induced pseudo-magnetic field in a doped type-II Weyl semimetal
• Influence of interactions on the anomalous quantum Hall effect
• A Note on Bloch theorem
• Inter-node superconductivity in strained Weyl semimetals
• Geometric transport signatures of strained multi-Weyl semimetals