Strain-induced topological charge control in multifold fermion systems

Abstract

Multifold fermion systems feature free fermionic excitations, which have no counterparts in high-energy physics, and exhibit several unconventional properties. Using first-principles calculations, we predict that strain engineering can be used to control the distribution of topological charges in transition metal silicide candidate CoSi, hosting multifold fermions. We demonstrate that breaking the rotational symmetry of the system, by choosing a suitable strain, destroys the multifold fermions, and at the same time results in the creation of Weyl points. We introduce a low energy effective model to complement the results obtained from density functional calculations. Our findings suggest that strain-engineering is a useful approach to tune topological properties of multifold fermions.

23 pages, 8 figures

References in corpus (22)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• The electronic properties of graphene
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Topological Semimetals
• Multiple types of topological fermions in transition metal silicides
• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Double-Weyl phonons in transition-metal monosilicides
• Double crystallographic groups and their representations on the Bilbao Crystallographic Server
• Crystal growth and quantum oscillations in the topological chiral semimetal CoSi
• Quasiparticle Interference Evidence of the Topological Fermi Arc States in Chiral Fermionic Semimetal CoSi
• Topological tuning in three-dimensional Dirac semimetals
• Breakdown of Three-dimensional Dirac Semimetal State in pressurized Cd3As2
• Observation of multiple types of topological fermions in PdBiSe
• Strain-induced quantum topological phase transitions in Na3Bi
• Direct observation of handedness-dependent quasiparticle interference in the two enantiomers of topological chiral semimetal PdGa
• Strain induced ${\mathbb{Z}}_2$ topological insulating state of $\beta$-As${}_2$Te${}_3$
• Control of superconducting pairing symmetries in monolayer black phosphorus
• Quantum oscillations and electronic structures in large Chern number semimetal RhSn
• Transport evidence of triply degenerate nodal semimetal YRh6Ge4