Giant Modulation of Interlayer Coupling in Twisted Bilayer ReS2

Giant Modulation of Interlayer Coupling in Twisted Bilayer ReS2

Abstract Stacking monolayers of two‐dimensional (2D) transition metal dichalcogenides with different twist angles can provide a way to tune their quantum optical and electronic characteristics. This study demonstrates that the bandgap energy and interlayer coupling strength of twisted bilayer (tBL)...

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Main Authors: Krishna P. Dhakal, Trang Thu Tran, Taegeon Lee, Wooseon Choi, Sean F. Peterson, Juan M. Marmolejo‐Tejada, Jaeuk Bahng, Daekwon Lee, Vu Khac Dat, Ji‐Hee Kim, Seong Chu Lim, Martín A. Mosquera, Young‐Min Kim, Heesuk Rho, Jeongyong Kim
Format: Article
Language:English
Published: Wiley 2025-06-01
Series:Advanced Science
Subjects:
excitons
interlayer coupling
ReS2, twistronics
Online Access:https://doi.org/10.1002/advs.202500411
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Summary:Abstract Stacking monolayers of two‐dimensional (2D) transition metal dichalcogenides with different twist angles can provide a way to tune their quantum optical and electronic characteristics. This study demonstrates that the bandgap energy and interlayer coupling strength of twisted bilayer (tBL) ReS2 can be continuously modulated by the twist angle. By controlling the twist angle between 0° and 10°, the exciton energy of tBL ReS2 is tuned over a range of 40 meV, which is comparable to the difference between the exciton energies of intrinsic monolayer and bilayer ReS2. Such a wide modulation range for the interlayer coupling strength of tBL ReS2, which significantly affects the band structure, is also shown by the systematic shift in the low‐and high‐frequency Raman modes and results of a strain study using scanning transmission electron microscopy imaging. Density functional theory calculations on moiré superlattice tBL ReS2 structures confirm a consistent increase in the bandgap with the twist angle. The strong modulation of interlayer coupling by the twist angle in tBL ReS2 is attributed to the low symmetry of the 1T' structure and in‐plane anisotropy of the ReS2 lattice. These findings demonstrate the enhanced tunability of twist‐controlled electronic structure in anisotropic 2D materials, offering new pathways for designing reconfigurable quantum materials.
ISSN:2198-3844

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