SciPost Submission Page
Screening and effective RPA-like charge susceptibility in the extended Hubbard model
by Aiman Al-Eryani, Sarah Heinzelmann, Kilian Fraboulet, Friedrich Krien, Sabine Andergassen
Submission summary
| Authors (as registered SciPost users): | Aiman Al-Eryani · Sabine Andergassen |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2412.07323v1 (pdf) |
| Date submitted: | 2024-12-13 17:35 |
| Submitted by: | Al-Eryani, Aiman |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
|
| Approaches: | Theoretical, Computational |
Abstract
We generalize the recently introduced single-boson exchange formalism to nonlocal interactions. In the functional renormalization group application to the extended Hubbard model in two dimensions, we show that the flow of the rest function can be neglected up to moderate interaction strengths. We explore the physics arising from the interplay between onsite and nearest-neighbor interactions in various parameter regimes by performing a fluctuation diagnostics. Differently from the magnetic and superconducting susceptibilities, the charge susceptibility appears to be described by the random phase approximation (RPA). We show that this behavior can be traced back to cancellations in the renormalization of the density fermion-boson coupling.
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
Current status:
In refereeing