Crystal growth and quantum oscillations in the topological chiral semimetal CoSi

Abstract

We survey the electrical transport properties of the single-crystalline, topological chiral semimetal CoSi which was grown via different methods. High-quality CoSi single crystals were found in the growth from tellurium solution. The sample's high carrier mobility enables us to observe, for the first time, quantum oscillations (QOs) in its thermoelectrical signals. Our analysis of QOs reveals two spherical Fermi surfaces around the R point in the Brillouin zone corner. The extracted Berry phases of these electron orbits are consistent with the -2 chiral charge as reported in DFT calculations. Detailed analysis on the QOs reveals that the spin-orbit coupling induced band-splitting is less than 2 meV near the Fermi level, one order of magnitude smaller than our DFT calculation result. We also report the phonon-drag induced large Nernst effect in CoSi at intermediate temperatures.

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• Quantum oscillations revealing topological band in kagome metal ScV6Sn6
• Chirality locking charge density waves in a chiral crystal
• Spin Hall effect in a spin-1 chiral semimetal
• Quantum Oscillations of the Quasiparticle Lifetime in a Metal
• Chiral Dirac fermion in a collinear antiferromagnet
• Hierarchy of quasi-symmetries and degeneracies in chiral crystal materials CoSi
• Quantum oscillations and electronic structures in large Chern number semimetal RhSn
• Magnetoresistance and Kohler rule in the topological chiral semimetals CoSi
• Theoretical study of topological properties of ferromagnetic pyrite CoS${}_2$
• Strain-induced topological charge control in multifold fermion systems
• Chiral Floquet Engineering on Topological Fermions in Chiral Crystals
• Shubnikov-de Haas and de Haas-van Alphen oscillation in Czochralski grown CoSi single crystal
• Fermi surface of the chiral topological semimetal CoSi
• Quantum oscillations and weak anisotropic resistivity in the chiral Fermion semimetal PdGa
• Electrical conductivity and screening effect of spin-1 chiral fermions scattered by charged impurities
• Band Curvature Effects on Quantum Transport of Spin-1 Chiral Fermion Systems
• Physical properties of RhGe and CoGe single crystals synthesized under high pressure
• Design Principles for Topological Thermoelectrics