Electronic structure of a Si-containing topological Dirac semimetal CaAl2Si2
arXiv:2006.09633 · doi:10.1103/PhysRevB.102.045106
Abstract
There has been an upsurge in the discovery of topological quantum materials, where various topological insulators and semimetals have been theoretically predicted and experimentally observed. However, only very few of them contains silicon, the most widely used element in electronic industry. Recently, ternary compound CaAl2Si2 has been predicted to be a topological Dirac semimetal, hosting Lorentz-symmetry-violating quasiparticles with a strongly tilted conical band dispersion. In this work, by using high-resolution angle-resolved photoemission spectroscopy (ARPES), we investigated the comprehensive electronic structure of CaAl2Si2. A pair of topological Dirac crossings is observed along the kz direction, in good agreement with the ab initio calculations, confirming the topological Dirac semimetal nature of the compound. Our study expands the topological material family on Si-containing compounds, which have great application potential in realizing low-cost, nontoxic electronic device with topological quantum states.
arXiv commentTo be published in PRB
References in corpus (31)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Topological Insulators with Inversion Symmetry
- A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
- Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
- WannierTools: An open-source software package for novel topological materials
- Topological invariants of time-reversal-invariant band structures
- Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
- Maximally-localized Wannier functions for entangled energy bands
- Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
- Experimental discovery of Weyl semimetal TaAs
- Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
- Observation of Weyl nodes in TaAs
- Discovery of a Weyl Fermion semimetal state in NbAs
- Catalogue of Topological Electronic Materials
- Evidence for Majorana bound state in an iron-based superconductor
- Bulk Fermi surface coexistence with Dirac surface state in BiSe: a comparison of photoemission and Shubnikov-de Haas measurements
- Discovery of topological chiral crystals with helicoid arc states
- New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
- Experimental Realization of Type-II Dirac Fermions in PdTe Superconductor
- A precise method for visualizing dispersive features in image plots
- Multiple topological states in iron-based superconductors
- Experimental evidence of type-II Dirac fermions in PtSe2
- Nontrivial Berry phase and type II Dirac transport in layered material PdTe2
- Observation of half-integer level shift of vortex bound states in an iron-based superconductor
- Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides
- Dirac Line-nodes and Effect of Spin-orbit Coupling in Non-symmorphic Critical Semimetal MSiS (M=Hf, Zr)
- Tunability of the topological nodal-line semimetal phase in ZrSiX-type materials
- Observation of Fermi arc spin texture in TaAs
- Manipulation of type-I and type-II Dirac points in PdTe2 superconductor by external pressure
- Topological Lifshitz Transitions and Fermi Arc Manipulation in Weyl Semimetal NbAs
- Magnetotransport properties of the layered CaAl2Si2 semimetal hosting multiple nontrivial topological states