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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.


  
Time Matters: The Carbon Footprint of Everyday Activities in Austria 期刊论文
ECOLOGICAL ECONOMICS, 2019, 164
作者:  Smetschka, Barbara;  Wiedenhofer, Dominik;  Egger, Claudine;  Haselsteiner, Edeltraud;  Moran, Daniel;  Gaube, Veronika
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
Time use  Sustainable consumption  Carbon footprints  Low carbon activities  Quality of life  Climate change  
The Neighbourhood in Pieces: The Fragmentation of Local Public Space in a Swedish Housing Area 期刊论文
INTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, 2019, 43 (5) : 870-887
作者:  Karrholm, Mattias;  Wirdelov, Johan
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
densification  territorial stigmatization  housing areas  local public space  
Experiences of Urban Militarism: Spatial Stigma, Ruins and Everyday Life 期刊论文
INTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, 2019, 43 (5) : 848-869
作者:  Pasquetti, Silvia
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/27
everyday life  Palestinians in urban Israel  ruination  spatial stigma  urban marginality  urban militarism  Lydda-Lod  Israel  
Bacteria-in-paper, a versatile platform to study bacterial ecology 期刊论文
ECOLOGY LETTERS, 2019, 22 (8) : 1316-1323
作者:  Hol, Felix J. H.;  Whitesides, George M.;  Dekker, Cees
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
Bacteria  colonisation  dendritic networks  experimental tools  habitat structure  microfabrication  paper  population dynamics  range expansion  spatial structure  
Muslim Hoedowns, Tenuous Language and the Uncertain Lives of an Urban Majority 期刊论文
INTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, 2019, 43 (6) : 1193-1208
作者:  Simone, Abdoumaliq
收藏  |  浏览/下载:0/0  |  提交时间:2019/11/27
Urban majority  Islamic ethos  peripheralization  collective life  
The restorative potential of a university campus: Objective greenness and student perceptions in Turkey and the United States 期刊论文
LANDSCAPE AND URBAN PLANNING, 2019, 187: 36-46
作者:  Gulwadi, Gowri Betrabet;  Mishchenko, Evrim Demir;  Hallowell, George;  Alves, Susana;  Kennedy, Megan
收藏  |  浏览/下载:7/0  |  提交时间:2019/11/27
Campus green space  Quality of life  Perceived restorativeness  Restorative environmental affordance  Undergraduate campuses  
From governing behaviour to transformative change: A typology of household energy initiatives in Switzerland 期刊论文
ENERGY POLICY, 2019, 129: 1261-1270
作者:  Sahakian, Marlyne;  Dobigny, Laure
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/26
Energy transition  Sufficiency  Households  Switzerland  
Spatially-explicit mapping of forest benefits and analysis of motivations for everyday-life's visitors on forest pathways in urban and rural contexts 期刊论文
LANDSCAPE AND URBAN PLANNING, 2019, 185: 83-95
作者:  Meyer, Markus A.;  Rathmann, Joachim;  Schulz, Christoph
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/26
Recreation  Human benefit  Visitor preferences  Forest function  Forest management  Ecosystem service  
Irregular Connections: Everyday Energy Politics in Catalonia 期刊论文
INTERNATIONAL JOURNAL OF URBAN AND REGIONAL RESEARCH, 2019, 43 (2) : 337-353
作者:  Angel, James
收藏  |  浏览/下载:7/0  |  提交时间:2019/04/09
Energy  infrastructure  social reproduction  everyday life  urban social movements  Catalonia  Barcelona