What are the theoretical foundations for the existence of Weyl semimetal phases in materials?
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The theoretical foundations for the existence of Weyl semimetal phases in materials lie in the breaking of either time-reversal or inversion symmetry, leading to unique electronic structures. Various materials like MoTe, RuO2, CeAlSi, and porous Ge and SiGe structures exhibit Weyl semimetal states based on first-principles calculations and experimental verifications. MoTe, for instance, transitions from nodal loop states to Weyl points under the influence of spin-orbit coupling and strain, showcasing tunable topological properties . RuO2 is predicted to host Weyl points and nodal loops due to its collinear antiferromagnetic nature, offering a platform for studying Weyl semimetal states in antiferromagnets . Additionally, noncentrosymmetric 2D structures like porous Ge and SiGe are identified as Weyl semimetals with unique topological features, expanding the family of Weyl materials in condensed matter physics . These diverse examples highlight the rich theoretical underpinnings supporting the emergence of Weyl semimetal phases in various materials.
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24 Aug 2022 | Theoretical foundations for Weyl semimetals include breaking time-reversal or inversion symmetry, leading to non-trivial band crossings near the Fermi level, as seen in InMnTi2. |
| Theoretical foundations for Weyl semimetals lie in breaking inversion or time-reversal symmetry, leading to emergent Weyl fermions. Magnetic Weyl semimetals offer insight into magnetism-topology interplay. | |
| Theoretical foundations for Weyl semimetal phases include collinear antiferromagnetic structures, small magnetocrystalline anisotropy energy, and the ability to transform between Weyl points and nodal loops. | |
| Theoretical foundations for Weyl semimetal phases include breaking time-reversal or inversion symmetry, leading to gapless electronic excitation in non-centrosymmetric materials like MoTe demonstrated in this study. | |
| Theoretical foundations for Weyl semimetals in materials include noncentrosymmetric structures with broken inversion symmetry, resulting in nontrivial topological phases, protected by specific symmetries, and featuring edge Fermi-arcs. |
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