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Plasmons in Holographic Graphene
by Ulf Gran, Marcus Tornsö, Tobias Zingg
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Submission summary
| Authors (as registered SciPost users): | Ulf Gran · Marcus Tornsö · Tobias Zingg |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/1804.02284v4 (pdf) |
| Date submitted: | 2019-07-09 02:00 |
| Submitted by: | Gran, Ulf |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
We demonstrate how self-sourced collective modes - of which the plasmon is a prominent example due to its relevance in modern technological applications - are identified in strongly correlated systems described by holographic Maxwell theories. The characteristic $\omega \propto \sqrt{k}$ plasmon dispersion for 2D materials, such as graphene, naturally emerges from this formalism. We also demonstrate this by constructing the first holographic model containing this feature. This provides new insight into modeling such systems from a holographic point of view, bottom-up and top-down alike. Beyond that, this method provides a general framework to compute the dynamical charge response of strange metals, which has recently become experimentally accessible due to the novel technique of momentum-resolved electron energy-loss spectroscopy~(M-EELS). This framework therefore opens up the exciting possibility of testing holographic models for strange metals against actual experimental data.
Current status:
Reports on this Submission
Report #1 by Anonymous (Referee 2) on 2020-3-27 (Invited Report)
- Cite as: Anonymous, Report on arXiv:1804.02284v4, delivered 2020-03-27, doi: 10.21468/SciPost.Report.1595
Strengths
1) I find the question of plasmons in holography very interesting.
2) The introduction is well written and motivates the rest of the paper.
Weaknesses
1) The main weakness of the paper is the lack of clarity for the technical details on the actual computation in the bulk spacetime.
2) I would like to see aspects of holographic renormalisation to be discussed somewhere in the paper.
Report
I find the question the authors try to answer very interesting. However, at this stage, the draft seems to be unclear in terms of the technical details of the computation. To reach a satisfactory level of clarity, the authors need to state what equations they are solving in the bulk and with what boundary conditions. They only seem to kind of focus on the latter but it is not done in a very direct way.