Kundu, S and Naik, MH and Krishnamurthy, HR and Jain, M (2022) Moiré induced topology and flat bands in twisted bilayer WSe2: A first-principles study. In: Physical Review B, 105 (8).
|
PDF
phy_rev_B_105-8_2022 .pdf - Published Version Download (2MB) | Preview |
Abstract
We study the influence of strong spin-orbit interaction on the formation of flat bands in relaxed twisted bilayer WSe2. Flat bands, well separated in energy, emerge at the band edges for twist angles ? near 0° and 60°. For ? near 0°, the interlayer hybridization together with a moiré potential determines the electronic structure. The bands near the valence band edge have nontrivial topology, with Chern numbers equal to +1 or -1. We propose that the nontrivial topology of the first band can be probed experimentally for twist angles less than a critical angle of 3.5°. For ? near 60°, the flattening of the bands arising from the K point of the unit cell Brillouin zone is a result of atomic rearrangements in the individual layers. Our findings on the flat bands and the localization of their wave functions for both ranges of ? match well with recent experimental observations.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review B |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Electronic structure; Wave functions, Bands edges; Electronic.structure; Energy; First-principle study; Flat band; Hybridisation; Nontrivial topology; Spin-orbit interaction; Twist angles; Twisted bilayers, Topology |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 29 Jun 2022 07:16 |
| Last Modified: | 29 Jun 2022 07:16 |
| URI: | https://eprints.iisc.ac.in/id/eprint/73858 |
Actions (login required)
 |
View Item |
