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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:11/0  |  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.


  
Frequency-Dependent P Wave Polarization and Its Subwavelength Near-Surface Depth Sensitivity 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019
作者:  Park, Sunyoung;  Tsai, Victor C.;  Ishii, Miaki
收藏  |  浏览/下载:8/0  |  提交时间:2020/02/17
body-wave polarization  depth sensitivity  near-surface structure  site characterization  seismic hazard assessment  Japan  
Stormquakes 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (22) : 12909-12918
作者:  Fan, Wenyuan;  McGuire, Jeffrey J.;  de Groot-Hedlin, Catherine D.;  Hedlin, Michael A. H.;  Coats, Sloan;  Fiedler, Julia W.
收藏  |  浏览/下载:8/0  |  提交时间:2020/02/17
stormquake  surface wave  USArray  hurriance  Nor'  Easter  ambient noise  
Effects of western Pacific intraseasonal convection on surface air temperature anomalies over North America 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019
作者:  Yang, Ying;  Zhu, Zhiwei;  Li, Tim;  Yao, Mengying
收藏  |  浏览/下载:13/0  |  提交时间:2020/02/17
convection  mid-to-high latitude Rossby wave train  North American surface air temperature  western Pacific intraseasonal oscillation  
Intraseasonal responses of sea surface and deep oceanic temperature anomalies in the northern Indian Ocean-western Pacific to the 30-60-day boreal summer atmospheric intraseasonal oscillation 期刊论文
CLIMATE DYNAMICS, 2019, 53: 4539-4552
作者:  Mao, Jiangyu;  Wang, Ming
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
Atmospheric intraseasonal oscillation  Northern Indian Ocean-western Pacific  Sea surface temperature  Deep oceanic temperature anomalies  Oceanic Kelvin wave  
ENSO influence on summer temperature over Arabian Peninsula: role of mid-latitude circulation 期刊论文
CLIMATE DYNAMICS, 2019, 53: 5047-5062
作者:  Almazroui, Mansour;  Rashid, Irfan Ur;  Saeed, Sajjad;  Islam, M. Nazrul
收藏  |  浏览/下载:8/0  |  提交时间:2019/11/27
Surface air temperature  Circumglobal wave train pattern  ENSO  Arabian Peninsula  
Wave climate projections along the Indian coast 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019, 39 (11) : 4531-4542
作者:  Chowdhury, Piyali;  Behera, Manasa Ranjan;  Reeve, Dominic E.
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/27
climate change  coastal vulnerability  dynamical projections  Indian coast  surface ocean waves  wave climate variability  
Influence of December snow cover over North America on January surface air temperature over the midlatitude Asia 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2019
作者:  Li, Jingyi;  Li, Fei;  He, Shengping;  Wang, Huijun;  Orsolini, Yvan J.
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/27
eddy-mean flow interaction  midlatitude Asia surface air temperature  North American snow cover  Rossby wave train  
Future projections of heat waves over India from CMIP5 models 期刊论文
CLIMATE DYNAMICS, 2019, 53: 975-988
作者:  Rohini, P.;  Rajeevan, M.;  Mukhopadhay, P.
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/27
Heat wave  CMIP5  Geopotential height  Land surface processes  El Nino  
Scaling of Drag Coefficients Under Five Tropical Cyclones 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (6) : 3349-3358
作者:  Hsu, Je-Yuan;  39;Asaro, Eric A.
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/26
new parameterization of drag coefficient  surface wave effect  storm-induced momentum  crosswind surface wind stress