SciPost Submission Page
Fragility of the antichiral edge states under disorder
by Marwa Mannaï, Eduardo Filipe Vieira de Castro, Sonia Haddad
Submission summary
| Authors (as registered SciPost users): | Sonia Haddad |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202406_00054v4 (pdf) |
| Date submitted: | 2025-04-20 18:58 |
| Submitted by: | Haddad, Sonia |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
Chiral edge states are the fingerprint of the bulk-edge correspondence in a Chern insulator. Co-propagating edge modes, known as antichiral edge states, have been predicted to occur in the so-called modified Haldane model describing a two-dimensional semi-metal with broken time reversal symmetry. These counterintuitive edge modes are argued to be immune to backscattering and extremely robust against disorder. Here, we investigate the robustness of the antichiral edge states in the presence of Anderson disorder. By computing different localization parameters, we show that these edge states are relatively fragile against disorder compared to the chiral modes. We confirm this fragility by calculating the backscattering localization length of the antichiral edge states. Our work provides insights to improve the transport efficiency in the burgeoning fields of antichiral topological photonics and acoustics.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
Author comments upon resubmission
List of changes
1/ We changed the sentences in the conclusion and the introduction as proposed by the Referees
2/ We changed the different panels in figure 7 as suggested by the Referee to clearly show the scaling behavior of the localization length.
3/ We added a figure (Fig. 8) showing the localization length Lambda_M/M, computed by TMM for a nanoribbon width M=32, as a function of the complex phase Phi which governs the Dirac point energy offset.