Related papers: Emergence of moiré superlattice potential in graphene by twisted-hBN layers

Emergence of moiré superlattice potential in graphene by twisted-hBN layers

URL: http://arxiv.org/abs/2405.10079v1
Date: Thu, 16 May 2024 13:22:04 GMT
Title: Emergence of moiré superlattice potential in graphene by twisted-hBN layers
Authors: Tianyu Zhang, Chengxin Xiao, Hongxia Xue, Wang Yao, Dong-Keun Ki,
Abstract summary: We present a novel approach to realize an atomically flat substrate with a periodic moir'e pattern. By constructing a twisted hBN (thBN) moir'e substrate at an angle of about 1$circ$, we show that the graphene on top, aligned around 15$circ$ with the neighboring hBN layers, exhibits typical transport properties. All features point to the existence of the moir'e potential in graphene formed by thBN with $sim$1$circ$ twist angle.
Score: 8.46876904184933
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Moir\'e superlattices formed in stacks of two or more 2D crystals with similar lattice structures have recently become excellent platforms to reveal new physics in low-dimensional systems. They are, however, highly sensitive to the angle and lattice constant differences between the associated crystals, limiting the range of the material choice and the possible moir\'e patterns for a given 2D crystal. Here, we present a novel approach to realize an atomically flat substrate with a periodic moir\'e pattern that can induce the moir\'e potential on the material on top by van der Waals (vdW) interactions, without suffering from the lattice and angle mismatch. By constructing a twisted hBN (thBN) moir\'e substrate at an angle of about 1$^\circ$, we show that the graphene on top, aligned around 15$^\circ$ with the neighboring hBN layers, exhibits typical transport properties under a hexagonal moir\'e potential, including multiple satellite Dirac points (DPs), Hofstadter butterfly effect, and Brown-Zak oscillations. All features point to the existence of the moir\'e potential in graphene formed by thBN with $\sim$1$^\circ$ twist angle. Further statistical study shows that the twist from a parallel interface between the hBN layers is critical to induce the moir\'e potential. Our study demonstrates that the thBN moir\'e substrate can be used to investigate moir\'e physics in arbitrary materials without being constrained by their lattice constants.

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