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Engineering topological flat bands in -valley moiré systems with Ising-type SOC: twisted 1T-ZrS and 1T-SnSe
Hanqi Pi, Yves H. Kwan, Haoyu Hu +8
Twisted moiré superlattices hosting topological flat bands provide a platform to explore the interplay between topology and correlations. Here we investigate topological band struc…
Tuning exciton emission via ferroelectric polarization at a heterogeneous interface between a monolayer transition metal dichalcogenide and a perovskite oxide membrane
Jaehong Choi, Kevin J. Crust, Lizhong Li +9
We demonstrate the integration of a thin BaTiO (BTO) membrane with monolayer MoSe in a dual gate device that enables in-situ manipulation of the BTO ferroelectric polarizat…
Frustrated magnetic interactions in a Wigner-Mott insulator
Yanhao Tang, Kaixiang Su, Lizhong Li +9
Two-dimensional semiconductor moiré materials have emerged as a highly controllable platform to simulate and explore quantum condensed matter. Compared to real solids, electrons in…
Strongly correlated excitonic insulator in atomic double layers
Liguo Ma, Phuong X. Nguyen, Zefang Wang +6
Excitonic insulators (EI) arise from the formation of bound electron-hole pairs (excitons) in semiconductors and provide a solid-state platform for quantum many-boson physics. Stro…
Creation of moiré bands in a monolayer semiconductor by spatially periodic dielectric screening
Yang Xu, Connor Horn, Jiacheng Zhu +9
Moiré superlattices of two-dimensional van der Waals materials have emerged as a powerful platform for designing electronic band structures and discovering emergent physical phenom…
Spatially mixed moiré excitons in two-dimensional van der Waals superlattices
Yanhao Tang, Jie Gu, Song Liu +5
Moiré superlattices open an unprecedented opportunity for tailoring interactions between quantum particles and their coupling to electromagnetic fields. Strong superlattice potenti…
WSe2/WS2 moiré superlattices: a new Hubbard model simulator
Yanhao Tang, Lizhong Li, Tingxin Li +8
The Hubbard model, first formulated by physicist John Hubbard in the 1960s, is a simple theoretical model of interacting quantum particles in a lattice. The model is thought to cap…
Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
Hyun Ho Kim, Bowen Yang, Siwen Li +16
We conduct a comprehensive study of three different magnetic semiconductors, CrI, CrBr, and CrCl, by incorporating both few- and bi-layer samples in van der Waals tunne…
Electrical tuning of layer-polarized exciton gases in WSe2 bilayers
Zefang Wang, Yi-Hsin Chiu, Kevin Honz +2
Van der Waals heterostructures formed by stacking two-dimensional atomic crystals are a unique platform for exploring new phenomena and functionalities. Interlayer excitons, bound…
Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides
Dinh Van Tuan, Benedikt Scharf, Zefang Wang +4
Many-body interactions in monolayer transition-metal dichalcogenides are strongly affected by their unique band structure. We study these interactions by measuring the energy shift…
Strongly enhanced charge-density-wave order in monolayer NbSe
Xiaoxiang Xi, Liang Zhao, Zefang Wang +4
Two-dimensional (2D) atomic materials possess very different properties from their bulk counterparts. While changes in the single-particle electronic properties have been extensive…
Tightly bound excitons in monolayer WSe2
Keliang He, Nardeep Kumar, Liang Zhao +4
Exciton binding energy and excited states in monolayers of tungsten diselenide (WSe2) are investigated using the combined linear absorption and two-photon photoluminescence excitat…