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Spectral Broadening of NWC Transmitter Signals in the Ionosphere 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Xia, Zhiyang;  Chen, Lunjin;  Zhima, Zeren;  Parrot, Michel
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/01
VLF transmitter  plasma instability  spectral broadening  lower hybrid wave  ionospheric disturbances  DEMETER satellite  
Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of omega(pe)/omega(ce)and Wave Frequency Dependence on Geomagnetic Activity 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Agapitov, O.;  Mourenas, D.;  Artemyev, A.;  Claudepierre, S. G.;  Hospodarsky, G.;  Bonnell, J. W.
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/01
electron lifetimes  plasmasphere  hiss waves  wave-particle interactions  
Lagrangian-based Simulations of Hypervelocity Impact Experiments on Mars Regolith Proxy 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Froment, M.;  Rougier, E.;  Larmat, C.;  Lei, Z.;  Euser, B.;  Kedar, S.;  Richardson, J. E.;  Kawamura, T.;  Lognonne, P.
收藏  |  浏览/下载:13/0  |  提交时间:2020/05/25
Parametric study  Lagrangian numerical model  Shock wave  granular media  Mars regolith  Impact  
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.


  
The Photoelectron-Driven Upper Hybrid Instability as the Cause of 150-km Echoes 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (8)
作者:  Longley, William J.;  Oppenheim, Meers M.;  Pedatella, Nick M.;  Dimant, Yakov S.
收藏  |  浏览/下载:4/0  |  提交时间:2020/07/02
150 km echoes  radar  valley region  ionosphere  plasma  instability  
Noninvasive 2D and 3D Mapping of Root Zone Soil Moisture Through the Detection of Coarse Roots With Ground-Penetrating Radar 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (5)
作者:  Liu, X.;  Chen, J.;  Butnor, J. R.;  Qin, G.;  Cui, X.;  Fan, B.;  Lin, H.;  Guo, L.
收藏  |  浏览/下载:13/0  |  提交时间:2020/05/13
ecohydrology  in situ  near-surface geophysics  soil mapping  soil-plant-water relationships  subsoil  
Resistance Formulations in Shallow Overland Flow Along a Hillslope Covered With Patchy Vegetation 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (5)
作者:  Crompton, Octavia;  Katul, Gabriel G.;  Thompson, Sally
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
surface roughness  overland flow  hydraulic resistance  hillslope hydrology  friction coefficients  
Performance of Radiative Transfer Models in the Microwave Region 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (6)
作者:  Moradi, Isaac;  Goldberg, Mitchell;  Brath, Manfred;  Ferraro, Ralph;  Buehler, Stefan A.;  Saunders, Roger;  Sun, Ninghai
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Elastic Impact Consequences for High-Frequency Earthquake Ground Motion 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (5)
作者:  Tsai, Victor C.;  Hirth, Greg
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
High-Frequency Waves Driven by Agyrotropic Electrons Near the Electron Diffusion Region 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (5)
作者:  Dokgo, Kyunghwan;  Hwang, Kyoung-Joo;  Burch, James L.;  Yoon, Peter H.;  Graham, Daniel B.;  Li, Wenya
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02