Tunable circular dichroism and valley polarization in the modified Haldane model
Journal
Physical Review B
Journal Volume
99
Journal Issue
16
Start Page
161404
ISSN
24699950
24699969
Date Issued
2019
Author(s)
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).
Subjects
Landforms
Light Absorption
Photonic Devices
Polarization
Transition Metals
Device Functionality
Haldane Model
Optical Phase
Polarization Dependence
Pseudospin
Transition Metal Dichalcogenides
Valley Current
Dichroism
Publisher
American Physical Society revtex@aps.org
Type
journal article