Academic Journal
The nature of correlations in the insulating states of twisted bilayer graphene
| العنوان: | The nature of correlations in the insulating states of twisted bilayer graphene |
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| المؤلفون: | Pizarro, José María, Calderón, M.J., Bascones, Elena |
| المساهمون: | Ministerio de Economía, Industria y Competitividad (España), Fundación Ramón Areces |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2019 |
| المجموعة: | Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| مصطلحات موضوعية: | Mott insulator, Correlations, Moiré, Twisted bilayer graphene |
| الوصف: | [EN] The recently observed superconductivity in twisted bilayer graphene emerges from insulating states believed to arise from electronic correlations. While there have been many proposals to explain the insulating behaviour, the commensurability at which these states appear suggests that they are Mott insulators. Here we focus on the insulating states with ±2 electrons or holes with respect to the charge neutrality point. We show that the theoretical expectations for the Mott insulating states are not compatible with the experimentally observed dependence on temperature and magnetic field if, as frequently assumed, only the correlations between electrons on the same site are included. We argue that the inclusion of non-local (inter-site) correlations in the treatment of the Hubbard model can bring the predictions for the magnetic and temperature dependencies of the Mott transition to an agreement with experiments and have consequences for the critical interactions, the size of the gap, and possible pseudogap physics. The importance of the inter-site correlations to explain the experimental observations indicates that the observed insulating gap is not the one between the Hubbard bands and that antiferromagnetic-like correlations play a key role in the Mott transition. ; Funding from Ministerio de Economía, Industria y Competitividad (Spain) and FEDER funds via grants No. FIS2014-53218-P and FIS2015-64654-P, and from Fundación Ramón Areces is gratefully acknowledged. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| Relation: | #PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2014-53218-P; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2015-64654-P; Publisher's version; https://doi.org/10.1088/2399-6528/ab0fa9; Sí; e-issn: 2399-6528; Journal of Physics Communications 3: 035024 (2019); http://hdl.handle.net/10261/210519; http://dx.doi.org/10.13039/501100010198; http://dx.doi.org/10.13039/100008054 |
| DOI: | 10.1088/2399-6528/ab0fa9 |
| DOI: | 10.13039/501100010198 |
| DOI: | 10.13039/100008054 |
| الاتاحة: | http://hdl.handle.net/10261/210519 https://doi.org/10.1088/2399-6528/ab0fa9 https://doi.org/10.13039/501100010198 https://doi.org/10.13039/100008054 |
| Rights: | open |
| رقم الانضمام: | edsbas.C5DC7F6B |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/2399-6528/ab0fa9 |
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