Robustness of spin-polarized edge states in a two-dimensional topological semimetal without inversion symmetry
arXiv:2107.12956 · doi:10.1103/PhysRevB.105.075403
Abstract
Three-dimensional topological gapless phases have attracted significant attention due to their unique electronic properties. A flagship example are Weyl semimetals, which require breaking time-reversal or inversion symmetry. In two dimensions, the dimensionality reduction requires imposing an additional symmetry, thereby weakening the phase. Like its three-dimensional counterpart, these two-dimensional Weyl semimetals present edge states directly related to Weyl nodes. The direct comparison with the edge states in zigzag-like terminated graphene ribbons is unavoidable, offering the question of how robust these states are and their differences. Here we benchmark the robustness of the edge states in two-dimensional Weyl semimetals without inversion symmetry with those present in zigzag graphene ribbons. Our results show that, despite having a similar electronic band structure, the edge states of two-dimensional Weyl semimetal are more robust against vacancies than graphene ribbons. We attribute this enhanced robustness to a crucial role of the spin degree of freedom in the former case
arXiv comment8 pages, 6 figures
References in corpus (37)
- Topological Insulators
- Topological insulators and superconductors
- Quantum Spin Hall Effect in Graphene
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Topological Order and the Quantum Spin Hall Effect
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
- 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
- Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
- Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
- Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal CdAs
- Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
- Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
- Kwant: a software package for quantum transport
- Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
- Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
- Observation of Weyl nodes in TaAs
- Discovery of a Weyl Fermion semimetal state in NbAs
- Dirac Semimetals in Two Dimensions
- Engineering of robust topological quantum phases in graphene nanoribbons
- The Zak phase and the existence of edge states in graphene
- Direct optical detection of Weyl fermion chirality in a topological semimetal
- Colossal Bulk Photovoltaic Effect in a Weyl Semimetal
- Berry Curvature Enhanced Nonlinear Photogalvanic Response of Type-II Weyl Cone
- Gate-Tunable Negative Longitudinal Magnetoresistance in the Predicted Type-II Weyl Semimetal WTe2
- Topological surface Fermi arcs in the magnetic Weyl semimetal CoSnS
- Observation of Fermi arc spin texture in TaAs
- Emergence of Two-Dimensional Massless Dirac Fermions, Chiral Pseudospins, and Berry's Phase in Potassium Doped Few-Layer Black Phosphorus
- Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus
- Spin-valley locking, bulk quantum Hall effect and chiral surface state in a noncentrosymmetric Dirac semimetal BaMnSb
- Unconventional topological phase transition in two-dimensional systems with space-time inversion symmetry
- Two-dimensional Dirac Semimetals without Inversion Symmetry
- Determine the chirality of Weyl fermions from the circular dichroism spectra of time-dependent ARPES
- Classification of accidental band crossings and emergent semimetals in two-dimensional noncentrosymmetric systems
- Two-dimensional Topological Semimetals Protected by Symmorphic Symmetries
- Edge states in a two-dimensional non-symmorphic semimetal