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Quasi-particle functional Renormalisation Group calculations in the two-dimensional t-t'-Hubbard model
by Daniel Rohe
Submission summary
| Authors (as registered SciPost users): | Daniel Rohe |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2304.09001v2 (pdf) |
| Date accepted: | Aug. 28, 2023 |
| Date submitted: | July 31, 2023, 7:55 a.m. |
| Submitted by: | Daniel Rohe |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
We extend and apply a recently introduced quasi-particle functional renormalisation group scheme to the two-dimensional Hubbard model with next-nearest-neighbour hopping and away from half filling. We confirm the generation of superconducting correlations in some regions of the phase diagram, but also find that the inclusion of self-energy feedback by means of a decreasing quasi-particle weight can suppress superconducting tendencies more than anti-ferromagnetic correlations by which they are generated. As a supplement, we provide sample results for the self-energy in second-order perturbation theory and address some conceptual matters.
List of changes
Addressed comments by referees, including:
- added a new section 3 on remarks and limitations
- added section 5.2 on caveats
- rearranged former appendix A.3 into main body
- various smaller updates
Published as SciPost Phys. 15, 192 (2023)
Reports on this Submission
Report #2 by Andrey Katanin (Referee 2) on 2023-8-15 (Invited Report)
Strengths
Weaknesses
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Requested changes
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Report #1 by Anonymous (Referee 1) on 2023-8-9 (Invited Report)
- Cite as: Anonymous, Report on arXiv:2304.09001v2, delivered 2023-08-09, doi: 10.21468/SciPost.Report.7629
Report
The drastic differences that result from the inclusion of self-energy feedback is an interesting observation. I hope this can be explored further, although I agree with the author that identifying a fully rigorous benchmarking model is a challenge in itself.
Since the changes made in the resubmission address my concerns to my satisfaction, I recommend publication of the manuscript.