SciPost Submission Page
Pseudogap metal and magnetization plateau from doping moiré Mott insulator
by Yang Zhang, Liang Fu
Submission summary
| Authors (as registered SciPost users): | Liang Fu |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202302_00017v1 (pdf) |
| Date accepted: | March 23, 2023 |
| Date submitted: | Feb. 9, 2023, 2:14 a.m. |
| Submitted by: | Liang Fu |
| Submitted to: | SciPost Physics Core |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
The problem of doping Mott insulators is of fundamental importance and long-standing interest in the study of strongly correlated electron systems. The advent of semiconductor based moire materials opens a new ground for simulating the Hubbard model on the triangular lattice and exploring its rich phase diagram as a function of doping and external magnetic field. Based on our recent identification of spin polaron quasiparticle in Mott insulator, in this work we predict the emergence of a pseudogap metal phase at small doping below half filling and an intermediate range of fields, which exhibits a single-particle gap and a doping-dependent magnetization plateau.
Published as SciPost Phys. Core 6, 038 (2023)
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2023-3-12 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202302_00017v1, delivered 2023-03-12, doi: 10.21468/SciPost.Report.6885
Report
Following their original study [ref. 1], the authors have calculated the magnetic response of the spin polaron phase in a hole-doped triangular Mott insulator. They found magnetization plateaus at intermediate magnetic fields (in between J and t) as a unique signature of the spin polaron phase. They have further calculated the Fermi surface and the energy dispersion of the spin polaron metal, and pointed out the presence of a single particle or spin gap in this novel metallic state, i.e. a pseudo-gap metal.
The study is timely and highly relevant to ongoing experimental studies of the triangular Hubbard physics in semiconductor moiré materials. Compared to their original study [ref. 1], the authors have predicted specific experimental observables that can be immediately tested by experiments. In this sense, the study is important and suitable for publication in SciPost. I only have a few minor comments that I would like the authors to address.
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The labels (N and N_h) in figure 1c are not defined in the main text or in the captions. I would recommend to label the curves in the doping levels delta.
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I recommend the authors to specify the value of delta in the caption of figure 2a.
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Can the authors comment on the Hall coefficient and its connection to the change in Fermi surface when the spin polaron metal is changed to a spin polarized metal with magnetic field? The authors have mentioned quantum oscillations as a probe of the Fermiology but the Hall effect could be a more realistic experimental probe in the near future.