Mott-moiré excitons DOI
T. S. Huang, Yang-Zhi Chou, Christopher L. Baldwin

et al.

Physical review. B./Physical review. B, Journal Year: 2023, Volume and Issue: 107(19)

Published: May 26, 2023

We develop a systematic theory for excitons subject to Fermi-Hubbard physics in moir\'e twisted transition metal dichalcogenides (TMDs). Specifically, we consider from two bands with Mott-insulating valence band sustaining ${120}^{\ensuremath{\circ}}$ spin order. These ``Mott-moir\'e excitons,'' which are achievable TMD heterobilayers, bound states of magnetic polaron the and free electron conduction band. find significantly narrower exciton bandwidths presence Hubbard physics, serving as potential experimental signature strong correlations. also demonstrate high tunability Mott-moir\'e through dependence their binding energies, diameters, on period. In addition, study between charges outside strongly correlated that these well exhibit signatures correlation. Our work provides guidelines future exploration triangular systems such heterobilayers.

Language: Английский

Moiré photonics and optoelectronics DOI
Luojun Du, Maciej R. Molas,

Zhiheng Huang

et al.

Science, Journal Year: 2023, Volume and Issue: 379(6639)

Published: March 31, 2023

Moiré superlattices, the artificial quantum materials, have provided a wide range of possibilities for exploration completely new physics and device architectures. In this Review, we focus on recent progress emerging moiré photonics optoelectronics, including but not limited to excitons, trions, polaritons; resonantly hybridized excitons; reconstructed collective excitations; strong mid- far-infrared photoresponses; terahertz single-photon detection; symmetry-breaking optoelectronics. We also discuss future opportunities research directions in field, such as developing advanced techniques probe emergent optoelectronics an individual supercell; exploring ferroelectric, magnetic, multiferroic systems; using external degrees freedom engineer properties exciting potential technological innovations.

Language: Английский

Citations

115
Correlated insulator of excitons in WSe 2 /WS 2 moiré superlattices DOI Open Access
Richen Xiong,

Jacob H. Nie,

Samuel L. Brantly

et al.

Science, Journal Year: 2023, Volume and Issue: 380(6647), P. 860 - 864

Published: May 11, 2023

A panoply of unconventional electronic states has been observed in moiré superlattices. Engineering similar bosonic phases remains, however, largely unexplored. We report the observation a correlated insulator tungsten diselenide/tungsten disulfide (WSe2/WS2) superlattices composed excitons, that is, tightly bound electron-hole pairs. develop pump probe spectroscopy method we use to observe an exciton incompressible state at filling νex = 1 and charge neutrality, indicating excitons. With varying density, continuously transitions into electron νe 1, suggesting mixed insulating between two limits. Our studies establish semiconducting as intriguing platform for engineering phases.

Language: Английский

Citations

61
Dipole ladders with large Hubbard interaction in a moiré exciton lattice DOI
Heonjoon Park,

Jiayi Zhu,

Xi Wang

et al.

Nature Physics, Journal Year: 2023, Volume and Issue: 19(9), P. 1286 - 1292

Published: June 1, 2023

Language: Английский

Citations

57
Engineering interlayer hybridization in van der Waals bilayers DOI
Elyse Barré, Medha Dandu, S. Kundu

et al.

Nature Reviews Materials, Journal Year: 2024, Volume and Issue: 9(7), P. 499 - 508

Published: April 8, 2024

Language: Английский

Citations

22
Moiré superlattices in twisted two-dimensional halide perovskites DOI
Shuchen Zhang, Linrui Jin,

Yuan Lu

et al.

Nature Materials, Journal Year: 2024, Volume and Issue: 23(9), P. 1222 - 1229

Published: June 21, 2024

Language: Английский

Citations

21
Two-Dimensional Transition Metal Dichalcogenides: A Theory and Simulation Perspective DOI
Sunny Gupta, Junjie Zhang, Jincheng Lei

et al.

Chemical Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Two-dimensional transition metal dichalcogenides (2D TMDs) are a promising class of functional materials for fundamental physics explorations and applications in next-generation electronics, catalysis, quantum technologies, energy-related fields. Theory simulations have played pivotal role recent advancements, from understanding physical properties discovering new to elucidating synthesis processes designing novel devices. The key has been developments ab initio theory, deep learning, molecular dynamics, high-throughput computations, multiscale methods. This review focuses on how theory contributed progress 2D TMDs research, particularly twisted moiré-based TMDs, predicting exotic phases TMD monolayers heterostructures, nucleation growth synthesis, comprehending electron transport characteristics different contacts potential devices based heterostructures. notable achievements provided by highlighted, along with the challenges that need be addressed. Although demonstrated prototype created, we conclude highlighting research areas demand most attention simulation might address them aid attaining true toward commercial device realizations.

Language: Английский

Citations

4
Hyperspectral imaging of exciton confinement within a moiré unit cell with a subnanometer electron probe DOI Open Access
Sandhya Susarla, Mit H. Naik, Daria D. Blach

et al.

Science, Journal Year: 2022, Volume and Issue: 378(6625), P. 1235 - 1239

Published: Dec. 15, 2022

Electronic and optical excitations in two-dimensional moir\'e systems are uniquely sensitive to local atomic registries, leading materials- twist-angle specific correlated electronic ground states with varied degree of localization. However, there has been no direct experimental correlation between the sub-nanometer structure emergent excitonic transitions, comprising tightly-bound pairs photoexcited electrons holes. Here, we use cryogenic transmission electron microscopy spectroscopy simultaneously image structural reconstruction associated localization lowest-energy intralayer exciton a rotationally aligned heterostructure WS2 WSe2 monolayers. In conjunction ab initio calculations, determine that center-of-mass wavefunction is strongly modulated space, confined radius ~ 2 nm around highest-energy stacking site unit-cell, forming triangular lattice. Our results provide evidence reconstructions lead confining potentials engineering strain at nanoscale will enable new types lattices.

Language: Английский

Citations

52
Rotational and dilational reconstruction in transition metal dichalcogenide moiré bilayers DOI Creative Commons
Madeline Van Winkle, Isaac M. Craig, Stephen Carr

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 24, 2023

Lattice reconstruction and corresponding strain accumulation play a key role in defining the electronic structure of two-dimensional moir\'e superlattices, including those transition metal dichalcogenides (TMDs). Imaging TMD moir\'es has so far provided qualitative understanding this relaxation process terms interlayer stacking energy, while models underlying deformation mechanisms have relied on simulations. Here, we use interferometric four-dimensional scanning transmission electron microscopy to quantitatively map mechanical deformations through which occurs small-angle twisted bilayer MoS2 WSe2/MoS2 heterobilayers. We provide direct evidence that local rotations govern for homobilayers, dilations are prominent heterobilayers possessing sufficiently large lattice mismatch. Encapsulation layers hBN further localizes enhances these in-plane pathways, suppressing out-of-plane corrugation. also find extrinsic uniaxial heterostrain, introduces constant difference leads redistribution strain, demonstrating another route modify potential.

Language: Английский

Citations

33
Stacking Order Engineering of Two-Dimensional Materials and Device Applications DOI
Carter Fox,

Yulu Mao,

Xiang Zhang

et al.

Chemical Reviews, Journal Year: 2023, Volume and Issue: 124(4), P. 1862 - 1898

Published: Dec. 27, 2023

Stacking orders in 2D van der Waals (vdW) materials dictate the relative sliding (lateral displacement) and twisting (rotation) between atomically thin layers. By altering stacking order, many new ferroic, strongly correlated topological orderings emerge with exotic electrical, optical magnetic properties. Thanks to weak vdW interlayer bonding, such highly flexible energy-efficient order engineering has transformed design of quantum properties materials, unleashing potential for miniaturized high-performance device applications electronics, spintronics, photonics, surface chemistry. This Review provides a comprehensive overview their applications, ranging from typical fabrication characterization methods novel physical emergent slidetronics twistronics prototyping. The main emphasis is on critical role affecting charge transfer, orbital coupling flat band formation innovative on-demand potentials. demonstrating correlation configurations functionality, we highlight implications next-generation electronic, photonic chemical energy conversion devices. We conclude our perspective this exciting field including challenges opportunities future research.

Language: Английский

Citations

31
Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices DOI Creative Commons

Haihong Zheng,

Biao Wu, Shaofei Li

et al.

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: May 12, 2023

The stacking of twisted two-dimensional (2D) layered materials has led to the creation moiré superlattices, which have become a new platform for study quantum optics. strong coupling superlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states, including unconventional superconductivity, Mott insulating excitons. However, impact adjusting localizing excitons Van der Waals heterostructures yet be explored experimentally. Here, we present experimental evidence localization-enhanced WSe2/WS2/WSe2 heterotrilayer with type-II band alignments. At low temperatures, observed multiple splitting heterotrilayer, is manifested as sharp emission lines, stark contrast excitonic behavior WSe2/WS2 heterobilayer (which linewidth 4 times wider). This due enhancement two potentials enabling highly localized at interface. confinement effect potential on further demonstrated by changes temperature, laser power, valley polarization. Our findings offer approach twist-angle heterostructures, development coherent light emitters.

Language: Английский

Citations

29