GSTDTAP

浏览/检索结果: 共25条,第1-10条 帮助

已选(0)清除 条数/页:   排序方式:
Localization and delocalization of light in photonic moire lattices 期刊论文
NATURE, 2020, 577 (7788) : 42-+
作者:  Wang, Peng;  Zheng, Yuanlin;  Chen, Xianfeng;  Huang, Changming;  Kartashov, Yaroslav V.;  Torner, Lluis;  Konotop, Vladimir V.;  Ye, Fangwei
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/03

Moire lattices consist of two superimposed identical periodic structures with a relative rotation angle. Moire lattices have several applications in everyday life, including artistic design, the textile industry, architecture, image processing, metrology and interferometry. For scientific studies, they have been produced using coupled graphene-hexagonal boron nitride monolayers(1,2), graphene-graphene layers(3,4) and graphene quasicrystals on a silicon carbide surface(5). The recent surge of interest in moire lattices arises from the possibility of exploring many salient physical phenomena in such systems  examples include commensurable-incommensurable transitions and topological defects(2), the emergence of insulating states owing to band flattening(3,6), unconventional superconductivity(4) controlled by the rotation angle(7,8), the quantum Hall effect(9), the realization of non-Abelian gauge potentials(10) and the appearance of quasicrystals at special rotation angles(11). A fundamental question that remains unexplored concerns the evolution of waves in the potentials defined by moire lattices. Here we experimentally create two-dimensional photonic moire lattices, which-unlike their material counterparts-have readily controllable parameters and symmetry, allowing us to explore transitions between structures with fundamentally different geometries (periodic, general aperiodic and quasicrystal). We observe localization of light in deterministic linear lattices that is based on flatband physics(6), in contrast to previous schemes based on light diffusion in optical quasicrystals(12), where disorder is required(13) for the onset of Anderson localization(14) (that is, wave localization in random media). Using commensurable and incommensurable moire patterns, we experimentally demonstrate the twodimensional localization-delocalization transition of light. Moire lattices may feature an almost arbitrary geometry that is consistent with the crystallographic symmetry groups of the sublattices, and therefore afford a powerful tool for controlling the properties of light patterns and exploring the physics of periodic-aperiodic phase transitions and two-dimensional wavepacket phenomena relevant to several areas of science, including optics, acoustics, condensed matter and atomic physics.


  
Quantifying snowfall from orographic cloud seeding 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (10) : 5190-5195
作者:  Friedrich, Katja;  Ikeda, Kyoko;  Tessendorf, Sarah A.;  French, Jeffrey R.;  Rauber, Robert M.;  Geerts, Bart;  Xue, Lulin;  Rasmussen, Roy M.;  Blestrud, Derek R.;  Kunkel, Melvin L.;  Dawson, Nicholas;  Parkinson, Shaun
收藏  |  浏览/下载:10/0  |  提交时间:2020/05/13
clouds  precipitation  cloud seeding  radar observations  gauge observations  
Adjustment of Radar-Gauge Rainfall Discrepancy Due to Raindrop Drift and Evaporation Using the Weather Research and Forecasting Model and Dual-Polarization Radar 期刊论文
WATER RESOURCES RESEARCH, 2019
作者:  Dai, Qiang;  Yang, Qiqi;  Han, Dawei;  Rico-Ramirez, Miguel A.;  Zhang, Shuliang
收藏  |  浏览/下载:11/0  |  提交时间:2020/02/16
radar rainfall  wind drift  dual-polarization radar  radar-gauge rainfall discrepancies  WRF  
Assessing Gauge Undercatch Correction in Arctic Basins in Light of GRACE Observations 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019
作者:  Behrangi, Ali;  Singh, Alka;  Song, Yang;  Panahi, Milad
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/27
precipitation  high latitude  gauge undercatch  GRACE  
Rainfall Estimation From Ground Radar and TRMM Precipitation Radar Using Hybrid Deep Neural Networks 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019
作者:  Chen, Haonan;  Chandrasekar, V;  Tan, Haiming;  Cifelli, Robert
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
rain gauge  ground radar  TRMM PR  neural network  hybrid system  rainfall estimation  
Identifying changing precipitation extremes in Sub-Saharan Africa with gauge and satellite products 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2019, 14 (8)
作者:  Harrison, Laura;  Funk, Chris;  Peterson, Pete
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
Africa  extreme  satellite data  gauge data  climate change  precipitation  trends  
A simple equation to study changes in rainfall statistics 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2019, 14 (8)
作者:  Benestad, Rasmus E.;  Parding, Kajsa M.;  Erlandsen, Helene B.;  Mezghani, Abdelkader
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
heavy rainfall  probability  rain gauge data  trend  wet-day frequency  wet-day mean precipitation  rainfall statistics  
A Review of Radar-Rain Gauge Data Merging Methods and Their Potential for Urban Hydrological Applications 期刊论文
WATER RESOURCES RESEARCH, 2019, 55 (8) : 6356-6391
作者:  Ochoa-Rodriguez, S.;  Wang, L. -P.;  Willems, P.;  Onof, C.
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27
weather radar  radar-rain gauge merging  urban hydrology  kriging  bias adjustment  Bayesian data combination  
Evaluation of the GSMaP_Gauge products using rain gauge observations and SWAT model in the Upper Hanjiang River Basin 期刊论文
ATMOSPHERIC RESEARCH, 2019, 219: 153-165
作者:  Deng, Pengxin;  Zhang, Mingyue;  Bing, Jianping;  Jia, Jianwei;  Zhang, Dongdong
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/26
GSMaP_Gauge  Rainfall  Precipitation correction  SWAT  Hanjiang River Basin  
Rainfall monitoring network design using conditioned Latin hypercube sampling and satellite precipitation estimates: An application in the ungauged Ecuadorian Amazon 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019, 39 (4) : 2209-2226
作者:  Contreras, Juan;  Ballari, Daniela;  de Bruin, Sytze;  Samaniego, Esteban
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/26
conditioned Latin hypercube sampling  Ecuadorian Amazon  poorly accessible areas  rain gauge network  satellite precipitation data  spatio-temporal monitoring  ungauged areas