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- W4361270010 abstract "Semi-Dirac fermions (SDFs) in two-dimensional (2D) systems, which simultaneously exhibit linear and quadratic dispersion around them, are a bridge linking linear and quadratic Dirac cones. However, the so-called SDFs in the reported 2D materials are doubly degenerate (namely semi-Weyl fermions), and are vulnerable against spin-orbital coupling (SOC). Here, we propose a 2D SOC-robust SDF which arises from nonsymmorphic symmetries. Unlike the known 2D SDFs, due to the presence of inversion and time reversal symmetries ($mathcal{I}mathcal{T}$), each crossing band is doubly degenerate, making the SDF of fourfold degeneracy. By high throughput screening, we find that 26 candidate 2D materials (such as ${mathrm{CuCN}}_{2}$, ${mathrm{CaI}}_{2}$, TlF) can hold SDFs, which belong to layer groups 40 ($pmam$), 43 ($pbaa$), and 45 ($pbma$), respectively. Furthermore, the symmetry protection mechanism, associated Fermi arc edge states, the catalytic performance, and the topological phase transitions under symmetry breaking of SDFs are revealed, providing a way for understanding 2D SOC-robust SDFs. Overall, our work proposes a class of topological phases, and provides a platform to study their fascinating physical effects." @default.
- W4361270010 created "2023-03-31" @default.
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- W4361270010 date "2023-03-30" @default.
- W4361270010 modified "2023-09-27" @default.
- W4361270010 title "Nonsymmorphic symmetry protected spin-orbit semi-Dirac fermions in two dimensions" @default.
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- W4361270010 doi "https://doi.org/10.1103/physrevb.107.115167" @default.
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