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Valleytronics in 2D Materials Roadmap
Kyle L. Seyler, Giancarlo Soavi, Bent Weber +30
Valleytronics exploits non-equivalent energy extrema in the electronic band structure of crystalline solids -- the valley degree of freedom -- to encode, manipulate, and read out i…
Gate-tunable antiferromagnetic Chern insulator in twisted bilayer transition metal dichalcogenides
Xiaoyu Liu, Chong Wang, Xiao-Wei Zhang +2
A series of recent experimental works on twisted MoTe homobilayers have unveiled an abundance of exotic states in this system. Valley-polarized quantum anomalous Hall states ha…
Observation of Fractionally Quantized Anomalous Hall Effect
Heonjoon Park, Jiaqi Cai, Eric Anderson +17
The integer quantum anomalous Hall (QAH) effect is a lattice analog of the quantum Hall effect at zero magnetic field. This striking transport phenomenon occurs in electronic syste…
A Quantized Interband Topological Index in Two-Dimensional Systems
Tharindu Fernando, Ting Cao
We introduce a novel gauge-invariant, quantized interband index in two-dimensional (2D) multiband systems. It provides a bulk topological classification of a submanifold of paramet…
Signatures of Fractional Quantum Anomalous Hall States in Twisted MoTe2 Bilayer
Jiaqi Cai, Eric Anderson, Chong Wang +13
The interplay between spontaneous symmetry breaking and topology can result in exotic quantum states of matter. A celebrated example is the quantum anomalous Hall (QAH) state, whic…
Kekulé Moiré Superlattices
Yusen Ye, Jimin Qian, Xiao-Wei Zhang +3
Moiré superlattices from stacks of van der Waals materials offer an exciting arena in the fields of condensed matter physics and materials science. Typically, these moiré superlatt…
Strain-programmable van der Waals magnetic tunnel junctions
John Cenker, Dmitry Ovchinnikov, Harvey Yang +12
The magnetic tunnel junction (MTJ) is a backbone device for spintronics. Realizing next generation energy efficient MTJs will require operating mechanisms beyond the standard means…
Mixed-dimensional moiré systems of graphitic thin films with a twisted interface
Dacen Waters, Ellis Thompson, Esmeralda Arreguin-Martinez +7
Moiré patterns formed by stacking atomically-thin van der Waals crystals with a relative twist angle can give rise to dramatic new physical properties. The study of moiré materials…
Tunable Exciton-Hybridized Magnon Interactions in a Layered Semiconductor
Geoffrey M. Diederich, John Cenker, Yafei Ren +8
The interaction between distinct excitations in solids is of both fundamental interest and technological importance. One example of such interactions is coupling between an exciton…
Intercell Moiré Exciton Complexes in Electron Lattices
Xi Wang, Xiaowei Zhang, Jiayi Zhu +12
Excitons, Coulomb-bound electron-hole pairs, play a fundamental role in both optical excitation and correlated phenomena in solids. When an exciton interacts with other quasi-parti…
Long-range transport of 2D excitons with acoustic waves
Ruoming Peng, Adina Ripin, Yusen Ye +9
Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum p…
Interlayer Electronic Coupling on Demand in a 2D Magnetic Semiconductor
Nathan P. Wilson, Kihong Lee, John Cenker +10
When monolayers of two-dimensional (2D) materials are stacked into van der Waals structures, interlayer electronic coupling can introduce entirely new properties, as exemplified by…
Spin Photovoltaic Effect in Magnetic van der Waals Heterostructures
Tiancheng Song, Eric Anderson, Matisse Wei-Yuan Tu +9
The development of van der Waals (vdW) crystals and their heterostructures has created a fascinating platform for exploring optoelectronic properties in the two-dimensional (2D) li…
Electric Field Tunable Topological Phases in Graphene Nanoribbons
Fangzhou Zhao, Ting Cao, Steven G. Louie
Graphene nanoribbons (GNRs) possess distinct symmetry-protected topological phases. We show, through first-principles calculations, that by applying an experimentally accessible tr…
Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
Zhipeng Li, Tianmeng Wang, Chenhao Jin +13
Inversion symmetry breaking and three-fold rotation symmetry grant the valley degree of freedom to the robust exciton in monolayer transition metal dichalcogenides (TMDCs), which c…
Switching 2D Magnetic States via Pressure Tuning of Layer Stacking
Tiancheng Song, Zaiyao Fei, Matthew Yankowitz +15
The physical properties of two-dimensional van der Waals (2D vdW) crystals depend sensitively on the interlayer coupling, which is intimately connected to the stacking arrangement…
Emerging Photoluminescence from the Dark-Exciton Phonon Replica in Monolayer WSe2
Zhipeng Li, Tianmeng Wang, Chenhao Jin +13
Tungsten-based monolayer transition metal dichalcogenides host a long-lived dark exciton, an electron-hole pair in a spin-triplet configuration. The long lifetime and unique spin p…
Giant and nonreciprocal second harmonic generation from layered antiferromagnetism in bilayer CrI3
Zeyuan Sun, Yangfan Yi, Tiancheng Song +14
Layered antiferromagnetism is the spatial arrangement of ferromagnetic layers with antiferromagnetic interlayer coupling. Recently, the van der Waals magnet, chromium triiodide (Cr…
Valley-dependent Exciton Fine Structure and Autler-Townes Doublets from Berry Phases in Monolayer Molybdenum Diselenide
Chaw-Keong Yong, M. Iqbal Bakti Utama, Chin Shen Ong +12
The Berry phase of Bloch states can have profound effects on electron dynamics lead to novel transport phenomena, such as the anomalous Hall effect and the valley Hall effect. Rece…
Topological Band Engineering of Graphene Nanoribbons
Daniel J. Rizzo, Gregory Veber, Ting Cao +6
Topological insulators (TIs) are an emerging class of materials that host highly robust in-gap surface/interface states while maintaining an insulating bulk. While most notable sci…
Ultrasensitive Tunability of the Direct Bandgap of Two-dimensional InSe Flakes via Strain Engineering
Yang Li§, Tianmeng Wang§, Meng Wu§ +9
InSe, a member of the layered materials family, is a superior electronic and optical material which retains a direct bandgap feature from the bulk to atomically thin few-layers and…
Band Topology, Orbital Phase Winding, and Selection Rules in Excitonic Physics in Two Dimensions
Ting Cao, Meng Wu, Steven G. Louie
We show that band topology can dramatically change the photophysics of two-dimensional (2D) semiconductors. For systems in which states near the band extrema are of multiple orbita…
Topological Phases in Graphene Nanoribbons: Junction States, Spin Centers and Quantum Spin Chains
Ting Cao, Fangzhou Zhao, Steven G. Louie
Knowledge of the topology of the electronic ground state of materials has led to deep insights to novel phenomena such as the integer quantum Hall effect and fermion-number fractio…
Magnetic brightening and control of dark excitons in monolayer WSe2
Xiao-Xiao Zhang, Ting Cao, Zhengguang Lu +9
Monolayer transition metal dichalcogenide (TMDC) crystals, as direct-gap materials with unusually strong light-matter interaction, have attracted much recent attention. In contrast…