Staff directory
Luis Manuel Canonico Armas
Postdoctoral Researcher
JdC-F
luis.canonico(ELIMINAR)@icn2.cat
Theoretical and Computational Nanoscience
- ORCID: 0000-0001-9266-7213
Publications
2023
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Connecting Higher-Order Topology with the Orbital Hall Effect in Monolayers of Transition Metal Dichalcogenides
Costa M; Focassio B; Canonico LM; Cysne TP; Schleder GR; Muniz RB; Fazzio A; Rappoport TG Physical Review Letters; 130 (11): 116204 - 116204. 2023. 10.1103/PhysRevLett.130.116204.
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Orbital magnetoelectric effect in nanoribbons of transition metal dichalcogenides
Cysne, TP; Guimaraes, FSM; Canonico, LM; Costa, M; Rappoport, TG; Muniz, RB Physical Review b; 107 (11): 115402. 2023. 10.1103/PhysRevB.107.115402.
2021
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Cysne et al. Reply: ()
Cysne T.P., Costa M., Canonico L.M., Nardelli M.B., Muniz R.B., Rappoport T.G. Physical Review Letters; 127 (14, 149702) 2021. 10.1103/PhysRevLett.127.149702. IF: 9.161
A Reply to the Comment by Cysne et al. © 2021 American Physical Society
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Disentangling Orbital and Valley Hall Effects in Bilayers of Transition Metal Dichalcogenides
Cysne T.P., Costa M., Canonico L.M., Nardelli M.B., Muniz R.B., Rappoport T.G. Physical Review Letters; 126 (5, 056601) 2021. 10.1103/PhysRevLett.126.056601. IF: 9.161
It has been recently shown that monolayers of transition metal dichalcogenides (TMDs) in the 2H structural phase exhibit relatively large orbital Hall conductivity plateaus within their energy band gaps, where their spin Hall conductivities vanish [Canonico et al., Phys. Rev. B 101, 161409 (2020)PRBMDO2469-995010.1103/PhysRevB.101.161409; Bhowal and Satpathy, Phys. Rev. B 102, 035409 (2020)PRBMDO2469-995010.1103/PhysRevB.102.035409]. However, since the valley Hall effect (VHE) in these systems also generates a transverse flow of orbital angular momentum, it becomes experimentally challenging to distinguish between the two effects in these materials. The VHE requires inversion symmetry breaking to occur, which takes place in the TMD monolayers but not in the bilayers. We show that a bilayer of 2H-MoS2 is an orbital Hall insulator that exhibits a sizeable orbital Hall effect in the absence of both spin and valley Hall effects. This phase can be characterized by an orbital Chern number that assumes the value CL=2 for the 2H-MoS2 bilayer and CL=1 for the monolayer, confirming the topological nature of these orbital-Hall insulator systems. Our results are based on density functional theory and low-energy effective model calculations and strongly suggest that bilayers of TMDs are highly suitable platforms for direct observation of the orbital Hall insulating phase in two-dimensional materials. Implications of our findings for attempts to observe the VHE in TMD bilayers are also discussed. © 2021 American Physical Society.
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Orbital magnetoelectric effect in zigzag nanoribbons of -band systems
Cysne T.P., Guimarães F.S.M., Canonico L.M., Rappoport T.G., Muniz R.B. Physical Review B; 104 (16, 165403) 2021. 10.1103/PhysRevB.104.165403. IF: 4.036
Profiles of the spin and orbital angular momentum accumulations induced by a longitudinally applied electric field are explored in nanoribbons of -band systems with a honeycomb lattice. We show that nanoribbons with zigzag borders can exhibit orbital magnetoelectric effects. More specifically, we have found that purely orbital magnetization oriented perpendicularly to the ribbon may be induced in these systems by means of the external electric field when sublattice symmetry is broken. The effect is rather general and may occur in other multiorbital materials. ©2021 American Physical Society
2018
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Shubnikov-de Haas oscillations in the anomalous Hall conductivity of Chern insulators
Canonico L.M., García J.H., Rappoport T.G., Ferreira A., Muniz R.B. Physical Review B; 98 (8, 085409) 2018. 10.1103/PhysRevB.98.085409. IF: 3.813
The Haldane model on a honeycomb lattice is a paradigmatic example of a system featuring quantized Hall conductivity in the absence of an external magnetic field, that is, a quantum anomalous Hall effect. Recent theoretical work predicted that the anomalous Hall conductivity of massive Dirac fermions can display Shubnikov-de Haas (SdH) oscillations, which could be observed in topological insulators and honeycomb layers with strong spin-orbit coupling. Here, we investigate the electronic transport properties of Chern insulators subject to high magnetic fields by means of accurate spectral expansions of lattice Green's functions. We find that the anomalous component of the Hall conductivity displays visible SdH oscillations at low temperature. The effect is shown to result from the modulation of the next-nearest-neighbor flux accumulation due to the Haldane term, which removes the electron-hole symmetry from the Landau spectrum. To support our numerical findings, we derive a long-wavelength description beyond the linear ("Dirac cone") approximation. Finally, we discuss the dependence of the energy spectra shift for reversed magnetic fields with the topological gap and the lattice bandwidth. © 2018 American Physical Society.