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Probing valley phenomena with gate-defined valley splitters
by Juan Daniel Torres Luna, Kostas Vilkelis, Antonio L. R. Manesco
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Antonio Manesco · Juan Daniel Torres Luna |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2405.00538v2 (pdf) |
| Code repository: | https://zenodo.org/records/11091444 |
| Data repository: | https://zenodo.org/records/11091444 |
| Date accepted: | Feb. 5, 2025 |
| Date submitted: | Dec. 4, 2024, 12:32 p.m. |
| Submitted by: | Manesco, Antonio |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
Despite many reports of valley-related phenomena in graphene and its multilayers, current transport experiments cannot probe valley phenomena without the application of external fields. Here we propose a gate-defined valley splitter as a direct transport probe for valley phenomenon in graphene multilayers. First, we show how the device works, its magnetotransport response, and its robustness against fabrication errors. Secondly, we present two applications for valley splitters: (i) resonant tunneling of quantum dots probed by a valley splitter shows the valley polarization of dot levels; (ii) a combination of two valley splitters resolves the nature of order parameters in mesoscopic samples.
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
The summary of the main revisions is in the list of changes below.
List of changes
- Added schematics of the gate layout for all the devices simulated in the text.
- Added an appendix discussing scaling and demonstrating its validity within the range of parameters of our transport calculations.
- Added an appendix showing the insensitivity of transport in the device to the angles between the arms.
- Added references to more experimental works showing valley filtering.
- Provided a more detailed description of the figures in the main text.
- Expanded on the meaning of intervalley coherence and the motivation to study it in the text.
Published as SciPost Phys. 18, 062 (2025)
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