Moiré patterns in van der Waals heterostructures

Ster, Maxime Le; Maerkl, Tobias; Kowalczyk, P.J.; Brown, Simon

doi:10.1103/physrevb.99.075422

Cited by 29 publications

(36 citation statements)

References 82 publications

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“…The lattice constant of hexagonal Bi(111) on HfTe2 template was found 4.55Å in good agreement with the lattice reported for thicker Bi(111) films on Si(111)-(7x7) [12][13][14]. The thickness of 12 Å corresponds to 3 BLs of Bi(111) which is also verified by STM measurements (Fig.…”

Section: Structural Characterizationsupporting

confidence: 88%

“…Among Bi allotropes two are the most stable: the so-called hexagonal Bi (111) (hex) and Bi pseudocubic (110) (PC) phases [12][13][14]. The hexagonal (111) structure on the distorted A7 phase, is the honeycomb hexagonal lattice of Bi and exists as a single bilayer [12][13][14][15][16][17]. The successful experimental growth of a hexagonal single bilayer Bi honeycomb lattice (i.e bismuthene) has been reported and a large band-gap 2D TI behavior has been assigned to this material [18].…”

Section: Introductionmentioning

confidence: 99%

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Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

Xenogiannopoulou¹,

Tsoutsou²,

Tsipas³

et al. 2021

Nanotechnology

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Among ultrathin Monoelemental 2D Materials (ME2DMs), bismuthene, the single layer of heavier group-VΑ element bismuth (Bi), has been predicted to have large nontrivial gap. Here, we demonstrate the growth of 3BL thin Bi(111) films by molecular beam epitaxy (MBE) on 2D-HfTe2 template. The electronic band structure of 3BL Bi(111) films was measured by Angle-Resolved Photoemission Spectroscopy (ARPES) showing very good matching with the theoretical DFT calculated band structure of the respective free standings Bi(111) layers. After capping with protective Al2O3 layer, the 3BL thin Bi(111) films on 2D-HfTe2 template were found to be stable under ambient conditions, which is required for practical applications and devices fabrications.

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Section: Structural Characterizationsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

Xenogiannopoulou¹,

Tsoutsou²,

Tsipas³

et al. 2021

Nanotechnology

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“…Recently, moiré superlattices have attracted extensive investigation because of the unconventional superconductivity observed at the “magic” angle in twisted bilayer graphene. , The twisted angle plays a crucial role in formation of moiré superlattices and engineering the properties of two-dimensional (2D) layered materials . Hence, considerable research efforts have been made to induce such a unique angle and to explore the moiré superlattice effects on twisted bilayer graphene.…”

mentioning

confidence: 99%

“…1,2 The twisted angle plays a crucial role in formation of moirésuperlattices and engineering the properties of two-dimensional (2D) layered materials. 3 Hence, considerable research efforts have been made to induce such a unique angle and to explore the moirésuperlattice effects on twisted bilayer graphene. For instance, a surge of fascinating phenomena, such as ferromagnetic hysteresis, 4 photonic crystals for nanolight, 5 a ferromagnetic Mott state, 6 and zero energy resonance 7 have been found in bilayer graphene moireś uperlattices.…”

mentioning

confidence: 99%

MoS₂ Moiré Superlattice for Hydrogen Evolution Reaction

et al. 2019

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A MoS2 moiré superlattice with a twisted angle of θ ≈ 7.3° via a facile method instead of a conventional mechanical stacking method is successfully fabricated. With reduced interlayer potential barriers demonstrated by first-principles calculations and ultralow frequency Raman spectra, electrons can transfer easily from a conductive substrate to active sites in this MoS2 superlattice, thus leading to good hydrogen evolution reaction (HER) activities. By using an electrochemical microcell technique, improved catalytic performance in the MoS2 moiré superlattice is validated, with a current density of −10 mA/cm2 at an overpotential of −153 mV and a Tafel slope of 73 mV/dec. A strategy to boost the electrocatalytic performance by reducing the interlayer potential barriers is successfully achieved by employing a MoS2 moiré superlattice. The work paves a new pathway to break the bottleneck for further improvement of HER performance and also opens interesting possibilities for implementing moiré superlattices in catalysis, energy storage, and 2D functional devices.

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“…This allowed them to explain the moiré pattern formed by mixed stacking sequences without relying on commensuration of the layered structures. [ 197 ] Their study is a first of its kind for interpreting the moiré patterns of any pair of 2D layered stacks. However, this also shows the vast opportunities that remain undeveloped owing to the dearth of explorations and the unavailability of comprehensive knowledge of this class of moiré patterns.…”

Section: Beyond Graphenementioning

confidence: 99%

Recent Advances in Twisted Structures of Flatland Materials and Crafting Moiré Superlattices

Abbas

Wang

et al. 2020

Adv Funct Materials

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The past decade has witnessed the occurrence of novel 2D moiré patterns in nanoflatland materials. These visually beautiful moiré superlattices have become a playground on which exotic quantum phenomena can be observed. The state‐of‐the‐art experimental techniques that have been developed for crafting moiré superlattices of flatland materials are reviewed. Graphene and its heterostructure with boron nitride have now sparked new interlayer twists as a new degree of freedom for tuning several angle‐dependent physical properties, e.g., the appearance of van Hove singularities, tunable Mott insulator states, and the Hofstadter butterfly pattern. Moreover, the interplay of correlated insulating states and superconductivity is recently observed for a so‐called magic‐angle twisted bilayer graphene. Furthermore, beyond graphene, other 2D materials, such as silicene, phosphorene, and the recent black phosphorus /MoS2 heterojunctions, which are 2D allotropes of bismuth and antimony grown on highly ordered pyrolytic graphite and MoS2, are considered. Finally, the optically important exciton phenomenon, which depends on the moiré potential and has been observed for a moiré superlattice of transition metal dichalcogenides, is discussed. This overview aims to cover all the fascinating prospects that depend on the moiré superlattice, ranging from electronic structure to optical exotics among flatland materials.

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Moiré patterns in van der Waals heterostructures

Cited by 29 publications

References 82 publications

Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

MoS₂ Moiré Superlattice for Hydrogen Evolution Reaction

Recent Advances in Twisted Structures of Flatland Materials and Crafting Moiré Superlattices

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Moiré patterns in van der Waals heterostructures

Cited by 29 publications

References 82 publications

Ultrathin epitaxial Bi film growth on 2D HfTe2 template

Ultrathin epitaxial Bi film growth on 2D HfTe2 template

MoS2 Moiré Superlattice for Hydrogen Evolution Reaction

Recent Advances in Twisted Structures of Flatland Materials and Crafting Moiré Superlattices

Contact Info

Product

Resources

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Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

Ultrathin epitaxial Bi film growth on 2D HfTe₂ template

MoS₂ Moiré Superlattice for Hydrogen Evolution Reaction