Results 41 to 50 of about 376,171 (129)

Unusual spin and angular momentum of Dyakonov waves at the hyperbolic-material surface

Optics Express, 2020
Three Dyakonov-like polaritons (DLPs) exist at the interface between a hyperbolic material (HM) and a covering medium (CM). Each DLP is a hybridized-polarization surface polariton composed of two evanescent waves on both sides of the interface. We investigated their spin and angular momentum.
Yuqi, Zhang, Xiangguang, Wang, Dezhi, Zhang, Shufang, Fu, Sheng, Zhou, Xuan-Zhang, Wang   +5 more
openaire   +2 more sources

Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis

Advanced Functional Materials, Volume 36, Issue 20, 9 March 2026.
An all‐optical method is presented for quantifying the density of boron vacancy spin defects in hexagonal boron nitride (hBN). By correlating Raman and photoluminescence signals with irradiation fluence, defect‐induced Raman modes are identified and established an relationship linking optical signatures to absolute defect densities. This enables direct
Atanu Patra, Paul Konrad, Andreas Sperlich, Timur Biktagirov, Wolf Gero Schmidt, Lesley Spencer, Igor Aharonovich, Sven Höfling, Vladimir Dyakonov   +8 more
wiley   +1 more source

Direct Observation of Intrinsic Spin–Layer Coupling and Robust Valley Polarization in Bilayer MoS2

Small Science, Volume 5, Issue 11, November 2025.
This study experimentally demonstrates finite and even enhanced circular polarization in bilayer MoS2, despite its centrosymmetric 2H stacking, across all temperatures. The degree of circular polarization exceeds that of monolayers, attributed to spin–layer coupling and suppression of spin‐flip processes.
Yumin Sim, Je‐Ho Lee, Nguyen T. Hoang, No‐Won Park, Sang‐Kwon Lee, Maeng‐Je Seong   +5 more
wiley   +1 more source

Broken Structural Symmetry in Terahertz Detectors: Physical Mechanisms, Device Design, and Recent Advances

Small Structures, Volume 6, Issue 11, November 2025.
Breaking the structural symmetry of devices is a crucial design strategy that endows terahertz (THz) detectors with novel operating mechanisms and unique characteristics. This study provides an in‐depth discussion on symmetry‐breaking‐induced phenomena, novel asymmetric structures, and dominant detection mechanisms.
Hecheng Han, Baoqing Zhang, Peng Guo, Shaocong Lv, Zihao Cheng, Yue Li, Yuxiang Li, Zihao Zhang, Jiawei Zhang   +8 more
wiley   +1 more source

Stone dust in endourology: a systematic review of its definition, management, and clinical impact

BJU International, Volume 136, Issue 2, Page 185-197, August 2025.
Objective To evaluate and synthesise the existing literature on stone dust (DUST) in endourology, focusing on its definition, creation methods, and removal techniques. Methods A comprehensive electronic literature search was conducted using the PubMed/Medline, Web Of Science, and Embase databases to identify reports published until October 2024.
Stefano Moretto, Alberto Quarà, Federico Zorzi, Alejandra Bravo‐Balado, Aideen Madden, Johan Cabrera, Mariela Corrales, Luigi Candela, Steeve Doizi, Frederic Panthier, Olivier Traxer   +10 more
wiley   +1 more source

Resonant Spin Amplification and Accumulation in MAPbI3 Single Crystals

Advanced Science, Volume 12, Issue 27, July 17, 2025.
Carrier spin dynamics are studied in a 20 µm thin MAPbI3 perovskite single crystal using time‐resolved Kerr ellipticity at cryogenic temperatures. Long spin relaxation (30 ns) and dephasing (21 ns) enable spin accumulation. Spin accumulation effects are discussed in detail along with carrier‐nuclear spin interactions.
Erik Kirstein, Dmitri R. Yakovlev, Evgeny A. Zhukov, Nataliia E. Kopteva, Bekir Turedi, Maksym V. Kovalenko, Manfred Bayer   +6 more
wiley   +1 more source

Optimizing Phononic Crystal Waveguides for Enhanced Surface Acoustic Wave Confinement

physica status solidi (b), Volume 262, Issue 7, July 2025.
A phononic crystal consisting of periodic arrays of nanofabricated holes on a surface can form a metamaterial‐like layer with properties different from the host material. Exploiting these surface properties, an optimized waveguide geometry is designed for surface acoustic waves using twofold elliptical cylinder inclusions to create a slow region that ...
Karanpreet Singh, Gabe Willson, James Adam Howard Stotz   +2 more
wiley   +1 more source

Effect of Crystal Symmetry of Lead Halide Perovskites on the Optical Orientation of Excitons

Advanced Science, Volume 12, Issue 15, April 17, 2025.
Lead halide perovskite semiconductors provide a platform for studying crystal symmetry effects on spin‐dependent properties via optical orientation of exciton and carrier spins. This study examines exciton spin polarization at 1.6 K in nearly cubic and orthorhombic perovskites.
Nataliia E. Kopteva, Dmitri R. Yakovlev, Eyüp Yalcin, Ina V. Kalitukha, Ilya A. Akimov, Mikhail O. Nestoklon, Bekir Turedi, Oleh Hordiichuk, Dmitry N. Dirin, Maksym V. Kovalenko, Manfred Bayer   +10 more
wiley   +1 more source

Determination of dissipative Dyakonov surface waves using a finite element method based eigenvalue algorithm.

Optics Express, 2017
A full-vectorial finite element method is developed to analyze the surface waves propagating at the interface between two media which could be dissipative particularly.
Pi-Kuei Shih, H. Hsiao, Hung-chun Chang
semanticscholar   +1 more source

Enhanced Cherenkov radiation in twisted hyperbolic Van der Waals crystals

InfoScience, Volume 2, Issue 1, March 2025.
Efficient Cherenkov radiation over a wide range of momenta is highly demanded for many applications but still remains a challenging task. Here, we demonstrated that twisted hyperbolic Van der Waals crystals enable enhancement of Cherenkov radiation in a broad range of wave vectors.
Hao Hu, Xiao Lin, Guangwei Hu, Francisco J. Garcia‐Vidal, Yu Luo   +4 more
wiley   +1 more source