Tunable circular dichroism and valley polarization in the modified Haldane model

Marc Vila, Nguyen Tuan Hung, Stephan Roche, Riichiro Saito

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We study the polarization dependence of optical absorption for a modified Haldane model, which exhibits antichiral edge modes in the 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 andvalley polarization can be tuned independently upon varying the Fermi energy. In particular, perfect circular dichroism and valley polarization are achieved simultaneously. This combination of optical properties suggests some interesting photonic device functionality (e.g., light polarizer) which could be combined with valleytronics applications (e.g., generation of valley currents).

Original languageEnglish
Article number161404
JournalPhysical Review B
Volume99
Issue number16
DOIs
Publication statusPublished - 2019 Apr 16

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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