Flat 
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 Moiré Bands in Twisted Bilayer 
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Gatti, G.; Issing, J.; Rademaker, Louk; Margot, Florian; Jong, Tobias A. de; Molen, Sense Jan van der; Teyssier, J.; Kim, T. K.; Watson, M. D.; Cacho, Céphise; Dudin, Pavel; Ávila, J.; Cordero‐Edwards, Kumara; Paruch, Patrycja; Ubrig, Nicolas; Gutiérrez-Lezama, Ignacio; Morpurgo, Alberto F.; Tamai, Anna; Baumberger, F.

doi:10.1103/physrevlett.131.046401

Cited by 15 publications

(3 citation statements)

References 49 publications

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“…We note that the resolution here (∼200 meV) is limited by sample quality and not instrument resolution. Our measurements do not preclude the existence of moiré bands around Γ , as previously observed in twisted bilayer WSe 2 . Under no conditions did we see replicas associated with moiré wavevectors of the graphene/WS 2 interface where the large lattice mismatch should make moiré modulations very small.…”

supporting

confidence: 76%

“…Our measurements do not preclude the existence of moirébands around Γ, as previously observed in twisted bilayer WSe 2 . 50 Under no conditions did we see replicas associated with moireẃ avevectors of the graphene/WS 2 interface where the large lattice mismatch should make moirémodulations very small. This argues in favor of a role for scattering from the moireṕ otential.…”

mentioning

confidence: 89%

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Conduction Band Replicas in a 2D Moiré Semiconductor Heterobilayer

Graham,

Park,

Nguyen

et al. 2024

Nano Lett.

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Stacking monolayer semiconductors creates moireṕ atterns, leading to correlated and topological electronic phenomena, but measurements of the electronic structure underpinning these phenomena are scarce. Here, we investigate the properties of the conduction band in moiréheterobilayers of WS 2 /WSe 2 using submicrometer angle-resolved photoemission spectroscopy with electrostatic gating. We find that at all twist angles the conduction band edge is the K-point valley of the WS 2 , with a band gap of 1.58 ± 0.03 eV. From the resolved conduction band dispersion, we deduce an effective mass of 0.15 ± 0.02 m e . Additionally, we observe replicas of the conduction band displaced by reciprocal lattice vectors of the moirésuperlattice. We argue that the replicas result from the moirépotential modifying the conduction band states rather than final-state diffraction. Interestingly, the replicas display an intensity pattern with reduced 3-fold symmetry, which we show implicates the pseudo vector potential associated with in-plane strain in moiréband formation.

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supporting

confidence: 76%

mentioning

confidence: 89%

Conduction Band Replicas in a 2D Moiré Semiconductor Heterobilayer

Graham,

Park,

Nguyen

et al. 2024

Nano Lett.

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“…This could be formed either by twisting layers of the same material at an appropriate angle or by aligning two different materials with a small lattice difference. In the momentum space, the superlattice defines another Brillouin zone with a smaller reciprocal lattice, which folds the parabolic band structure defined by the atomic lattice into a sequence of new bands characterized by remarkably narrow bandwidths, commonly referred to as moiré flat bands. − Similar to their graphene counterparts, these TMD moiré superlattices have undergone extensive investigation in both theoretical studies and experiments primarily because of the diverse quantum phenomena they facilitate.…”

Section: Introductionmentioning

confidence: 99%

Spotlight: Visualization of Moiré Quantum Phenomena in Transition Metal Dichalcogenide with Scanning Tunneling Microscopy

Zhou,

Liang,

et al. 2024

ACS Appl. Electron. Mater.

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Transition metal dichalcogenide (TMD) moirésuperlattices have emerged as a significant area of study in condensed matter physics. Thanks to their superior optical properties, tunable electronic band structure, strong Coulomb interactions, and quenched electron kinetic energy, they offer exciting avenues to explore correlated quantum phenomena, topological properties, and light−matter interactions. In recent years, scanning tunneling microscopy (STM) has made significant impacts on the study of these fields by enabling intrinsic surface visualization and spectroscopic measurements with unprecedented atomic scale detail. Here, we spotlight the key findings and innovative developments in imaging and characterization of TMD heterostructures via STM, from its initial implementation on the in situ grown sample to the latest photocurrent tunneling microscopy. The evolution in sample design, progressing from a conductive to an insulating substrate, has not only expanded our control over TMD moirésuperlattices but also promoted an understanding of their structures and strongly correlated properties, such as the structural reconstruction and formation of generalized two-dimensional Wigner crystal states. In addition to highlighting recent advancements, we outline upcoming challenges, suggest the direction of future research, and advocate for the versatile use of STM to further comprehend and manipulate the quantum dynamics in TMD moirésuperlattices.

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