Tunable Circular Dichroism and Valley Polarization in the Modified Haldane Model

Abstract

We study the polarization dependence of optical absorption for the modified Haldane model, which exhibits antichiral edge modes in presence of sample boundaries and has been argued to be realizable in transition metal dichalcogenides or Weyl semimetals. A rich optical phase diagram is unveiled, in which the correlations between perfect circular dichroism, pseudospin and valley polarization can be tuned independently upon varying the Fermi energy. Importantly, perfect circular dichroism and valley polarization are achieved simultaneously. This unprecedented combination of optical properties suggests some interesting novel photonic device functionality (e.g. light polarizer) which could be combined with valleytronics applications (e.g. generation of valley currents).

arXiv commentPublished in Phys. Rev. B 99, 161404(R)

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Cited by in corpus (9)

• Optical properties of massive anisotropic tilted Dirac systems
• Anti-chiral edge states in Heisenberg ferromagnet on a honeycomb lattice
• Optical manifestations and bounds of topological Euler class
• Antichiral states in twisted graphene multilayers
• Strain tuned topology in the Haldane and the modified Haldane models
• The influence of anti-chiral edge states on Andreev reflection in graphene-superconductor junction
• Bulk-edge correspondence in two-dimensional topological semimetals: A transfer matrix study of antichiral edge modes
• Valley Gapless Semiconductor: Models and Applications
• Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions