تقرير
Kekul\'e spirals and charge transfer cascades in twisted symmetric trilayer graphene
| العنوان: | Kekul\'e spirals and charge transfer cascades in twisted symmetric trilayer graphene |
|---|---|
| المؤلفون: | Wang, Ziwei, Kwan, Yves H., Wagner, Glenn, Bultinck, Nick, Simon, Steven H., Parameswaran, S. A. |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | We study the phase diagram of magic-angle twisted symmetric trilayer graphene in the presence of uniaxial heterostrain and interlayer displacement field. For experimentally reasonable strain, our mean-field analysis finds robust Kekul\'e spiral order whose doping-dependent ordering vector is incommensurate with the moir\'e superlattice, consistent with recent scanning tunneling microscopy experiments, and paralleling the behaviour of closely-related twisted bilayer graphene (TBG) systems. Strikingly, we identify a new possibility absent in TBG: the existence of $\textit{commensurate}$ Kekul\'e spiral order even at zero strain for experimentally realistic values of the interlayer potential in a trilayer. Our studies also reveal a complex pattern of charge transfer between weakly- and strongly-dispersive bands in strained trilayer samples as the density is tuned by electrostatic gating, that can be understood intuitively in terms of the `cascades' in the compressibility of magic-angle TBG. Comment: 5 + 7 pages; we are informed of an erroneous convention in the preprint version of an experimental paper by private communication from the authors, conclusion unchanged |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2310.16094 |
| رقم الأكسشن: | edsarx.2310.16094 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |