Results 81 to 90 of about 3,336 (157)

High‐Order Nonlinear Photonic Crystal with Ordered Structures for Giant Enhancement of Frequency Tripling

Advanced Science, Volume 13, Issue 23, 23 April 2026.
A meta‐YAG crystal with artificially order/disorder structures was fabricated to realize the efficient third‐harmonic generation at 343 nm with a conversion efficiency of 4.5×10−3, surpassing six orders of magnitude compared to bulk YAG crystal. Moreover, a wide spectral tunability from 331 to 356 nm was also achieved in the meta‐YAG, indicating its ...
Xiaotian Guo, Qiaoling Han, Fei Liang, Bin Zhang, Dazhi Lu, Haohai Yu, Huaijin Zhang   +6 more
wiley   +1 more source

Generation of Anisotropic Massless Dirac Fermions and Asymmetric Klein Tunneling in Few-Layer Black Phosphorus Superlattices

, 2016
Artificial lattices have been employed in many two-dimensional systems, including those of electrons, atoms and photons, in a quest for massless Dirac particles with flexibility and controllability.
Cao, Ting, Li, Zhenglu, Louie, Steven G., Wu, Meng   +3 more
core   +2 more sources

Emerging single‐element ferroelectrics: From theory to experiment

InfoMat, Volume 8, Issue 4, April 2026.
This review explores recent developments in single‐element ferroelectrics, covering mechanisms of ferroelectric behavior, their crystal structures, key preparation methods, ferroelectric performance characteristics, and promising device applications in field‐effect transistors, photodetectors, and visual perceptrons.
Run Zhao, Yuhang Zhang, Chen‐Min Dai, Fan Li, Jinlei Zhang, Ju Gao, Yucheng Jiang, Cheng‐Wei Qiu   +7 more
wiley   +1 more source

Phase mapping of aging process in InN nanostructures: oxygen incorporation and the role of the zincblende phase

, 2009
Uncapped InN nanostructures undergo a deleterious natural aging process at ambient conditions by oxygen incorporation. The phases involved in this process and their localization is mapped by Transmission Electron Microscopy (TEM) related techniques.
Ackland G J, D González, F M Morales, Inushima T, J G Lozano, M Herrera, O Briot, R García, Read D T, S Ruffenach, Williams D B   +10 more
core   +3 more sources

Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell

Nature Communications
Moiré superlattices of transition metal dichalcogenides offer a unique platform to explore correlated exciton physics with optical spectroscopy. Whereas the spatially modulated potentials evoke that the exciton resonances are distinct depending on a site
Jinjae Kim, Jiwon Park, Hyojin Choi, Taeho Kim, Soonyoung Cha, Yewon Lee, Kenji Watanabe, Takashi Taniguchi, Jonghwan Kim, Moon-Ho Jo, Hyunyong Choi   +10 more
doaj   +1 more source

Raman-scattering study of the phonon dispersion in twisted bi-layer graphene

, 2013
Bi-layer graphene with a twist angle \theta\ between the layers generates a superlattice structure known as Moir\'{e} pattern. This superlattice provides a \theta-dependent q wavevector that activates phonons in the interior of the Brillouin zone.
Achete, C. A., Campos-Delgado, J., Cançado, L. G., Jorio, A., Raskin, J. -P.   +4 more
core   +1 more source

Spin transport of a doped Mott insulator in moiré heterostructures

Nature Communications
Moiré superlattices of semiconducting transition metal dichalcogenide heterobilayers are model systems for investigating strongly correlated electronic phenomena.
Emma C. Regan, Zheyu Lu, Danqing Wang, Yang Zhang, Trithep Devakul, Jacob H. Nie, Zuocheng Zhang, Wenyu Zhao, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Alex Zettl, Liang Fu, Feng Wang   +13 more
doaj   +1 more source

Soliton superlattices in twisted hexagonal boron nitride. [PDF]

, 2019
Properties of atomic van der Waals heterostructures are profoundly influenced by interlayer coupling, which critically depends on stacking of the proximal layers.
Basov, DN, Chen, LX, Du, Y, Fogler, MM, Frenzel, AJ, Goldflam, MD, Jiang, B-Y, Ni, GX, Sun, ZY, Wang, H, Xie, XM   +10 more
core   +1 more source

A New Platform for Twistronics: Perovskite Moiré Superlattices Beyond van der Waals

Small Structures
Moiré superlattices have reshaped condensed‐matter physics by enabling twist‐angle engineering of electronic and excitonic states, traditionally in van der Waals (vdW) systems. This Perspective focuses on perovskites as a transformative non‐van der Waals
Shule Huang, Shukai Chen, Libai Huang, Letian Dou   +3 more
doaj   +1 more source

Electric-Field Switchable Chirality in Rhombohedral Graphene Chern Insulators Stabilized by Tungsten Diselenide

Physical Review X
Chern insulators host topologically protected chiral edge currents with quantized conductance characterized by their Chern number. Switching the chirality of a Chern insulator, namely, the direction of the edge current, is highly challenging due to ...
Jing Ding, Hanxiao Xiang, Jiannan Hua, Wenqiang Zhou, Naitian Liu, Le Zhang, Na Xin, Bing Wu, Kenji Watanabe, Takashi Taniguchi, Zdeněk Sofer, Wei Zhu, Shuigang Xu   +12 more
doaj   +1 more source