Higherorder obstructed atomic insulator phase inpentagonal monolayer PdSe2
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Date
2024Author
Nuñez V
Bravo S
Correa J.D
Chico L
Pacheco M.
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We investigate a pentagonal monolayer of palladium diselenide, a stable twodimensional system, as a material realization of a crystalline phase with nontrivial topological electronic properties. We find that its electronic structure involves an atomic obstructed insulator related to higherorder topology, which is a consequence of the seleniumselenium bond dimerization along with inversion and timereversal symmetry). By means of firstprinciples calculations and the analysis of symmetry indicators and topological invariants, we also characterize the electronic corner states associated with the atomic obstruction and compute the corresponding corner charge for a finite geometry, which is found to be not quantized but still inversionprotected. Applying tensile strain to the finite geometry we verify the robustness of the corner states and also achieve a straincontrolled variation of the corner charge magnitude. © 2023 IOP Publishing Ltd.
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