Tunable circular dichroism and valley polarization in the modified Haldane model
Vila Tusell, Marc (Universitat Autònoma de Barcelona. Departament de Física)
Hung, Nguyen Tuan (Tohoku University (Japó). Department of Physics)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Saito, Riichiro (Tohoku University (Japó). Department of Physics)

Data:	2019
Resum:	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).
Ajuts:	European Commission 696656
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Device functionality ; Haldane model ; Optical phase ; Polarization dependence ; Pseudospin ; Transition metal dichalcogenides ; Valley current
Publicat a:	Physical review B, Vol. 99, issue 16 (April 2019) , art. 161404, ISSN 2469-9969

DOI: 10.1103/PhysRevB.99.161404

Postprint 7 p, 3.9 MB

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