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Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene | | Tobias M. R. Wolf
; Oded Zilberberg
; Gianni Blatter
; Jose L. Lado
; | | Date: |
14 Aug 2020 | | Abstract: | Van der Waals heterostructures provide a rich platform for emergent physics
due to their tunable hybridization of electronic orbital- and spin-degrees of
freedom. Here, we show that a heterostructure formed by twisted bilayer
graphene sandwiched between ferromagnetic insulators develops flat bands
stemming from the interplay between twist, exchange proximity and spin-orbit
coupling. We demonstrate that in this flat-band regime, the spin degree of
freedom is hybridized, giving rise to an effective triangular superlattice with
valley as a degenerate pseudospin degree of freedom. Incorporating electronic
interactions at half-filling leads to a spontaneous valley-mixed state, i.e., a
correlated state in the valley sector with geometric frustration of the valley
spinor. We show that an electric interlayer bias generates an artificial
valley-orbit coupling in the effective model, controlling both the valley
anisotropy and the microscopic details of the correlated state, with both
phenomena understood in terms of a valley-Heisenberg model with easy-plane
anisotropic exchange. Our results put forward twisted graphene encapsulated
between magnetic van der Waals heterostructures as platforms to explore purely
valley-correlated states in graphene. | | Source: | arXiv, 2008.06441 | | Services: | Forum | Review | PDF | Favorites | |
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