Confined Trions and Mott-Wigner States in a Purely Electrostatic Moiré Potential

Physical Review X, Journal Year: 2025, Volume and Issue: 15(1)

Published: March 5, 2025

Moiré heterostructures consisting of transition metal dichalcogenide (TMD) heterobilayers and homobilayers have emerged as a promising material platform to study correlated electronic states. Optical signatures strong correlations in the form Mott-Wigner states fractional Chern insulators already been observed TMD monolayers their twisted bilayers. In this work, we use moiré substrate containing hexagonal boron nitride (h-BN) interface externally generate superlattice potential for layer: The periodic structure ferroelectric domains h-BN creates purely electrostatic charge carriers. We find direct evidence induced emergence new excitonic resonances at integer fillings our observation an enhancement trion binding energy by ≃3 meV. A theoretical model exciton-electron interactions allows us directly determine modulation 30±5 meV from measured shift. obtain order linked filling factors ν=1/3 ν=2/3 through associated exciton umklapp resonances. Published American Physical Society 2025

Language: Английский

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Magnetic Bloch states at integer flux quanta induced by super-moiré potential in graphene aligned with twisted boron nitride

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 21, 2025

Two-dimensional electron systems in both magnetic fields and periodic potentials are described by the Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré provide powerful method to realize this type spectrum, previous experiments have been limited fractional flux quanta regime, due difficulty building ~ 50 nm modulations. Here, we demonstrate super-moiré strategy overcome challenge. By aligning monolayer graphene (G) with 1.0° twisted hexagonal boron nitride (t-hBN), 63.2 bichromatic G/t-hBN is constructed, made possible exploiting electrostatic nature t-hBN potential. Under field $$B$$ , Bloch states at $$\phi /{\phi }_{0}=1-9$$ achieved observed as integer Brown-Zak oscillations, expanding from fractions integers. Theoretical analysis reproduces these experimental findings. This work opens promising avenues study unexplored explore emergent topological order engineer long-wavelength Twisted van der Waals structures shown many emerging physical properties, but uniform wavelengths usually < structural relaxation. authors report fabrication based on graphene/twisted nitride, showing homogeneous wavelength up resulting oscillations quanta.

Language: Английский

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Substrate contribution to van der Waals interaction on surface of monolayer boron nitride

Applied Surface Science, Journal Year: 2025, Volume and Issue: unknown, P. 163261 - 163261

Published: April 1, 2025

Language: Английский

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Moiré Potential Independent of Moiré Size Down to a Few Nanometers in Sliding Ferroelectrics

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Sliding ferroelectricity represents a way to realize atomically thin ferroelectric materials. Due the moiré pattern formed during stacking process, alternating domain network provides an attractive superlattice of electrostatic potential modulate electronic structures another material sitting on it. The relationship between magnitude and size, however, has been controversial in literature. In addition, how strong remains for sizes down 10 nm range is unclear. this study, we use contact-mode scanning tunneling microscopy with high spatial energy resolution show that independent size ranging from hundreds several nanometers. We also determined solely by specific materials used fabricate stack. This study important information sliding ferroelectrics can foster their application modulating other

Language: Английский

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