In:
Nature, Springer Science and Business Media LLC, Vol. 620, No. 7975 ( 2023-08-24), p. 756-761
Abstract:
Van der Waals assembly enables the design of electronic states in two-dimensional (2D) materials, often by superimposing a long-wavelength periodic potential on a crystal lattice using moiré superlattices 1–9 . This twistronics approach has resulted in numerous previously undescribed physics, including strong correlations and superconductivity in twisted bilayer graphene 10–12 , resonant excitons, charge ordering and Wigner crystallization in transition-metal chalcogenide moiré structures 13–18 and Hofstadter’s butterfly spectra and Brown–Zak quantum oscillations in graphene superlattices 19–22 . Moreover, twistronics has been used to modify near-surface states at the interface between van der Waals crystals 23,24 . Here we show that electronic states in three-dimensional (3D) crystals such as graphite can be tuned by a superlattice potential occurring at the interface with another crystal—namely, crystallographically aligned hexagonal boron nitride. This alignment results in several Lifshitz transitions and Brown–Zak oscillations arising from near-surface states, whereas, in high magnetic fields, fractal states of Hofstadter’s butterfly draw deep into the bulk of graphite. Our work shows a way in which 3D spectra can be controlled using the approach of 2D twistronics.
Type of Medium:
Online Resource
ISSN:
0028-0836
,
1476-4687
DOI:
10.1038/s41586-023-06264-5
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
120714-3
detail.hit.zdb_id:
1413423-8
SSG:
11
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