Canted antiferromagnetism and excitonic order in gated double-layer graphene
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911227643428864 |
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| author | Apinyan, V. Kopeć, T. K. |
| author_facet | Apinyan, V. Kopeć, T. K. |
| contents | We study the effects of the electron-electron interactions on the excitonic properties and charge-density modulations in the AB stacked double-layer (DL) graphene, placed in the external gate-potential $V$. The coexistence of the canted antiferromagnetic order and excitonic pairing gap has been studied with the help of the generalized Hubbard model. We calculate the chemical potential $μ$, the average charge density difference between the layers $δ{\bar{n}}$, the antiferromagnetic gap-function $Δ_{\rm AFM}$ and the excitonic order parameters $Δ_σ$ in the zero temperature limit. We found that the excitonic pairing order parameter has a larger energy scale than the canted antiferromagnetic gap-function. The charge neutrality, in the DL graphene system, occurs only in the absence of the external gate-potential $V$. Moreover, we have shown that the values of the antiferromagnetic gap-function $Δ_{\rm AFM}$ and excitonic order parameter $Δ_σ$ are always increasing at the large values of inter-layer Coulomb interaction, while they are decreasing for large values of the applied gate-potential $V$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_19881 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Canted antiferromagnetism and excitonic order in gated double-layer graphene Apinyan, V. Kopeć, T. K. Strongly Correlated Electrons We study the effects of the electron-electron interactions on the excitonic properties and charge-density modulations in the AB stacked double-layer (DL) graphene, placed in the external gate-potential $V$. The coexistence of the canted antiferromagnetic order and excitonic pairing gap has been studied with the help of the generalized Hubbard model. We calculate the chemical potential $μ$, the average charge density difference between the layers $δ{\bar{n}}$, the antiferromagnetic gap-function $Δ_{\rm AFM}$ and the excitonic order parameters $Δ_σ$ in the zero temperature limit. We found that the excitonic pairing order parameter has a larger energy scale than the canted antiferromagnetic gap-function. The charge neutrality, in the DL graphene system, occurs only in the absence of the external gate-potential $V$. Moreover, we have shown that the values of the antiferromagnetic gap-function $Δ_{\rm AFM}$ and excitonic order parameter $Δ_σ$ are always increasing at the large values of inter-layer Coulomb interaction, while they are decreasing for large values of the applied gate-potential $V$. |
| title | Canted antiferromagnetism and excitonic order in gated double-layer graphene |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.19881 |