DOAJ Open Access 2022

Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario

Dmitry V. Chichinadze Laura Classen Yuxuan Wang Andrey V. Chubukov

Abstrak

Abstract Motivated by measurements of compressibility and STM spectra in twisted bilayer graphene, we analyze the pattern of symmetry breaking for itinerant fermions near a van Hove singularity. Making use of an approximate SU(4) symmetry of the Landau functional, we show that the structure of the spin/isospin order parameter changes with increasing filling via a cascade of transitions. We compute the feedback from different spin/isospin orders on fermions and argue that each order splits the initially 4-fold degenerate van Hove peak in a particular fashion, consistent with the STM data and compressibility measurements, providing a unified interpretation of the cascade of transitions in twisted bilayer graphene. Our results follow from a generic analysis of an SU(4)-symmetric Landau functional and are valid beyond a specific underlying fermionic model. We argue that an analogous van Hove scenario explains the cascade of phase transitions in non-twisted Bernal bilayer and rhombohedral trilayer graphene.

Topik & Kata Kunci

Materials of engineering and construction. Mechanics of materials Atomic physics. Constitution and properties of matter

Penulis (4)

Dmitry V. Chichinadze

Laura Classen

Yuxuan Wang

Andrey V. Chubukov

Format Sitasi

APA MLA BibTeX

Chichinadze, D.V., Classen, L., Wang, Y., Chubukov, A.V. (2022). Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario. https://doi.org/10.1038/s41535-022-00520-z

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Informasi Jurnal

Tahun Terbit: 2022
Sumber Database: DOAJ
DOI: 10.1038/s41535-022-00520-z
Akses: Open Access ✓