Magnetic, transport and topological properties of Co-based shandite thin films
arXiv:2212.09026 · doi:10.1038/s42005-024-01534-8
Abstract
The kagome ferromagnet, Co-based shandite Co3Sn2S2, shows a large anomalous Hall effect (AHE) associated with the Weyl nodes. A thin film with a Co kagome monolayer was predicted to exhibit the quantum AHE, which awaits the experimental realisation. However, it is challenging to precisely predict how the Weyl nodes reside in thin films where the lattice and electronic structures are in general different from the bulk. Here we report comprehensive ab initio results for thin films of Co3Sn2S2 with one, two and three Co layers with Sn or S surface terminations. We find that all the Sn-end films stabilise a ferromagnetic state similar to the bulk, and retain the large AHE down to the monolayer limit where the AHE is quantised, while the magnetic and topological properties drastically change with the number of Co layers in the S-end films. Our results would stimulate further experimental exploration of thin Weyl materials.
arXiv comment13 pages, 8 figures
References in corpus (32)
- Van der Waals heterostructures
- Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
- Maximally-localized generalized Wannier functions for composite energy bands
- Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
- Weyl and Dirac Semimetals in Three Dimensional Solids
- Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
- Type-II Weyl Semimetals
- Maximally-localized Wannier functions for entangled energy bands
- Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
- Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
- Chern Numbers in Discretized Brillouin Zone: Efficient Method of Computing (Spin) Hall Conductances
- Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
- Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
- Magnetic Weyl Semimetal Phase in a Kagome Crystal
- Signatures of the Adler-Bell-Jackiw chiral anomaly in a Weyl Fermion semimetal
- Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
- Berry phase effect in anomalous thermoelectric transport
- Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
- Direct optical detection of Weyl fermion chirality in a topological semimetal
- Chiral anomaly and transport in Weyl metals
- Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
- Topological surface Fermi arcs in the magnetic Weyl semimetal CoSnS
- Surface states in bulk single crystal of topological semimetal CoSnS towards water oxidation
- Giant anomalous Nernst effect in the magnetic Weyl semimetal Co3Sn2S2
- Direct Observation of Nonequivalent Fermi-Arc States of Opposite Surfaces in Noncentrosymmetric Weyl Semimetal NbP
- Spin Texture in Type-II Weyl Semimetal WTe2
- Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2
- Emerging chiral edge states from the confinement of a magnetic Weyl semimetal in CoSnS
- Maximally localized Wannier function within linear combination of pseudo-atomic orbital method: Implementation and applications to transition-metal-benzene complex
- Enhancement of transverse thermoelectric conductivity originating from stationary points in nodal line
- First-principles investigation of magnetic and transport properties in hole-doped shandite compounds CoInSnS
- Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films