Dynamic band-structure tuning of graphene moiré superlattices with pressure

Nature
Matthew YankowitzCory R Dean

Abstract

Heterostructures can be assembled from atomically thin materials by combining a wide range of available van der Waals crystals, providing exciting possibilities for designer electronics 1 . In many cases, beyond simply realizing new material combinations, interlayer interactions lead to emergent electronic properties that are fundamentally distinct from those of the constituent layers 2 . A critical parameter in these structures is the interlayer coupling strength, but this is often not easy to determine and is typically considered to be a fixed property of the system. Here we demonstrate that we can controllably tune the interlayer separation in van der Waals heterostructures using hydrostatic pressure, providing a dynamic way to modify their electronic properties. In devices in which graphene is encapsulated in boron nitride and aligned with one of the encapsulating layers, we observe that increasing pressure produces a superlinear increase in the moiré-superlattice-induced bandgap-nearly doubling within the studied range-together with an increase in the capacitive gate coupling to the active channel by as much as 25 per cent. Comparison to theoretical modelling highlights the role of atomic-scale structural deformations and ...Continue Reading

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Citations

Feb 27, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Chen DaiBo Zhang
Oct 30, 2019·Nature Materials·Tiancheng SongXiaodong Xu
Aug 8, 2018·Physical Review Letters·Fengcheng WuA H MacDonald
Jan 27, 2019·Science·Matthew YankowitzCory R Dean
Mar 9, 2019·Science·Benjamin E Feldman
Jun 6, 2019·Nature Communications·Shenyang HuangHugen Yan
Nov 7, 2018·Nature Nanotechnology·Kin Fai Mak, Jie Shan
Jan 17, 2019·Advanced Materials·Zhaohe DaiZhong Zhang
Oct 30, 2019·Nature Materials·Tingxin LiJie Shan
Feb 18, 2020·Science Advances·Zihao WangC R Woods
Dec 7, 2019·Physical Review Letters·Michał Papaj, Liang Fu
Apr 8, 2020·Science Advances·Hiroki IsobeLiang Fu
Sep 26, 2020·Physical Review Letters·Ziyan ZhuEfthimios Kaxiras
May 10, 2020·Physical Review Letters·Nick BultinckMichael P Zaletel
Dec 7, 2019·Physical Review Letters·Moon Jip ParkSungBin Lee
May 27, 2020·Nature Materials·Mauro Brotons-GisbertBrian D Gerardot
May 18, 2020·Scientific Reports·Ramiro Marcelo Dos SantosLuiz Antonio Ribeiro
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Jan 30, 2020·Nature Communications·Zhaoli GaoA T Charlie Johnson
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Jan 22, 2020·Nano Letters·Miša AnđelkovićFrançois M Peeters
Aug 18, 2021·Nature Nanotechnology·Xin-Rui MaoRen-Min Ma

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