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arXiv 2023年

作者： Xing, Zhaohui Jin, Guangrong Du, Qing Pang, Peiyuan Liu, Tanghao Shen, Yang Zhang, Dengliang Yu, Bufan Liang, Yue Yang, Dezhi Tang, Jianxin Wang, Lei Xing, Guichuang Chen, Jiangshan Ma, Dongge Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou510640 China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Macau999078 China Faculty of Innovation Engineering Macau University of Science and Technology Macau Taipa999078 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China

Metal halide perovskites, a class of cost-effective semiconductor materials, are of great interest for modern and upcoming display technologies that prioritize the light-emitting diodes (LEDs) with high efficiency and excellent color purity. The prevailing approach to achieving efficient luminescence from pervoskites is enhancing exciton binding effect and confining carriers by reducing their dimensionality or grain size. However, splitting pervoskite lattice into smaller ones generates abundant boundaries in solid films and results in more surface trap states, needing exact passivation to suppress trap-assisted nonradiative losses. Here, an ions-induced heteroepitaxial growth method is employed to assembe perovskite lattices with different structures into large-sized grains to produce lattice-anchored nanocomposites for efficient LEDs with high color purity. This approach enables the nanocomposite thin films, composed of three-dimensional (3D) CsPbBr3 and its variant of zero-dimensional (0D) Cs4PbBr6, to feature significant low trap-assisted nonradiative recombination, enhanced light out-coupling with a corrugated surface, and well-balanced charge carrier transport. Based on the resultant 3D/0D perovskite nanocomposites, we demonstrate the perovskite LEDs achieving an remarkable external quantum efficiency of 31.0% at the emission peak of 521 nm with a narrow full width at half-maximum of only 18 nm. This research introduces a novel approach to the development of well-assembled nanocomposites for perovskite LEDs, demonstrating high efficiency comparable to that of state-of-the-art organic LEDs. Copyright © 2023, The Authors. All rights reserved.

关键词： Perovskite

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Optimal demonstration of generalized quantum contextuality

arXiv

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arXiv 2024年

作者： Hazra, Soumyabrata Saha, Debashis Chaturvedi, Anubhav Bera, Subhankar Majumdar, A.S. International Institute of Information Technology Gachibowli Hyderabad500032 India School of Physics Indian Institute of Science Education and Research Kerala Thiruvananthapuram695551 India Faculty of Applied Physics and Mathematics Gdańsk University of Technology Gabriela Narutowicza 11/12 Gdańsk80-233 Poland University of Gdańsk Gdańsk80-308 Poland S. N. Bose National Centre for Basic Sciences Block JD Sector III Salt Lake Kolkata700106 India

Finding a set of empirical criteria fulfilled by any theory that satisfies the generalized notion of noncontextuality is a challenging task of both operational and foundational importance. The conventional approach of deriving facet inequalities from the relevant noncontextual polytope is computationally demanding. Specifically, the noncontextual polytope is a product of two polytopes, one for preparations and the other for measurements, and the dimension of the former typically increases polynomially with the number of measurements. This work presents an alternative methodology for constructing a polytope that encompasses the actual noncontextual polytope while ensuring that the dimension of the polytope associated with the preparations remains constant regardless of the number of measurements and their outcome size. In particular, the facet inequalities of this polytope serve as necessary conditions for noncontextuality. To demonstrate the efficacy of our methodology, we apply it to nine distinct contextuality scenarios involving four to nine preparations and two to three measurements to obtain the respective sets of facet inequalities. Additionally, we retrieve the maximum quantum violations of these inequalities. Our investigation uncovers many novel non-trivial noncontextuality inequalities and reveals intriguing aspects and applications of quantum contextual correlations. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum theory

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Optical and Morphological Properties of Highly Photoluminescent 2,4,5-Triphenyl Imidazole: An Experimental and Theoretical Study

SSRN

引用

SSRN 2023年

作者： Ouedghiri-Idrissi, Ismail El Sofiani, Zouhair Laouid, Amina Talbi, Abdelali Tarbi, Amal Kouari, Youssef El Zawadzka, Anna Laboratory of Materials Energy and Systems Control Faculty of Sciences and Technology Hassan II University of Casablanca B.P 146 Mohammedia Morocco Center for Modern Interdisciplinary Technologies Nicolaus Copernicus University in Toruń Wilenska 4 TorunPL 87-100 Poland Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University in Torun Grudziadzka 5 TorunPL 87-100 Poland National School of Applied Sciences Engineering Science for Energy Laboratory Chouaib Doukkali University of El Jadida El Jadida Morocco Laboratory of Materials Physics and Subatomics Department of Physics Faculty of Science Ibn Tofail University BP. 242 Kénitra14000 Morocco

The 2,4,5-Triphenyl Imidazole (TPI) were deposited as thin film by means of the physical vapor deposition (PVD) on glass and silicon substrates. On the other hand, three solutions were prepared with different concentrations using Dimethyl Sulfoxide (DMSO) solvent. The physical properties of all samples were investigated using different techniques. For this purpose, the morphology of the thin film was analysed with the atomic force microscopy (AFM) and showed a highly rough surface. The optical properties of the thin film and the solutions were investigated via transmittance, and absorbance, which helped determine a band gap of 3.45 eV. Photoluminescence and thermal photoluminescence spectroscopy showed the high emission of the material in its different aspects. While theoretical simulations of the HOMO-LUMO gap and electronic absorption spectra were acquired using the Density Functional Theory (DFT) approach. © 2023, The Authors. All rights reserved.

关键词： Thin films

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Terrain prickliness: Theoretical grounds for high complexity viewsheds 11

Terrain prickliness: Theoretical grounds for high complexity...

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11th International Conference on Geographic Information science - Part II, GIscience 2021

作者： Acharyya, Ankush Jallu, Ramesh K. Löffler, Maarten Meijer, Gert G.T. Saumell, Maria Silveira, Rodrigo I. Staals, Frank Czech Academy of Sciences Institute of Computer Science Prague Czech Republic Deptartment of Information and Computing Sciences Utrecht University Netherlands Academy of ICT and Creative Technologies NHL Stenden University of Applied Sciences Netherlands Department of Theoretical Computer Science Faculty of Information Technology Czech Technical University in Prague Czech Republic Department of Mathematics Universitat Politècnica de Catalunya Barcelona Spain Department of Information and Computing Sciences Utrecht University Netherlands

ISBN: (纸本)9783959772082

An important task in terrain analysis is computing viewsheds. A viewshed is the union of all the parts of the terrain that are visible from a given viewpoint or set of viewpoints. The complexity of a viewshed can vary significantly depending on the terrain topography and the viewpoint position. In this work we study a new topographic attribute, the prickliness, that measures the number of local maxima in a terrain from all possible angles of view. We show that the prickliness effectively captures the potential of terrains to have high complexity viewsheds. We present near-optimal algorithms to compute it for TIN terrains, and efficient approximate algorithms for raster DEMs. We validate the usefulness of the prickliness attribute with experiments in a large set of real terrains. © Ankush Acharyya, Ramesh K. Jallu, Maarten Löffler, Gert G.T. Meijer, Maria Saumell, Rodrigo I. Silveira, and Frank Staals;licensed under Creative Commons License CC-BY 4.0

关键词： Landforms

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Charge and spin interplay in a molecular-dimer-based organic Mott insulator

引用

Physical Review B 2022年第6期106卷 064202-064202页

作者： Natalia Drichko Shiori Sugiura Minoru Yamashita Akira Ueda Shinya Uji Nora Hassan Yoshiya Sunairi Hatsumi Mori Elena I. Zhilyaeva Svetlana Torunova Rimma N. Lyubovskaya Institute for Quantum Matter and Department of Physics and Astronomy Johns Hopkins University Baltimore Maryland 21218 USA The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan National Institute for Materials Science Tsukuba Ibaraki 305-0003 Japan Graduate School of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki 305-8577 Japan Department of Chemistry Faculty of Advanced Science and Technology Kumamoto University Kumamoto 860-8555 Japan Institute of Problems of Chemical Physics RAS Chernogolovka Moscow region 142432 Russia

Triangular lattice quasi-two-dimensional Mott insulators based on the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) molecule and its analogies present a possibility to produce exotic phases by coupling charge and spin degrees of freedom. In this work we discuss magnetic properties of one such material, κ-(BEDT-TTF)2Hg(SCN)2Cl, which is found at the border of the phase transition between a Mott insulator into a charge ordered state. Our magnetic susceptibility and cantilever magnetization measurements demonstrate how the charge degree of freedom defines magnetic properties for few different charge phases observed in this material as a function of temperature. Between TCO=30K and TS=24K we observe charge and spin separation due to one-dimensional charge stripes formed in this material below TCO=30K. Below TS=24K charge and spin degrees of freedom demonstrate coupling. Spin-singlet correlations develop below 24 K, however, the melting of charge order below 15 K prevents the spin-singlet-state formation, leaving the system in the inhomogeneous state with charge ordered spin-singlet domains and charge and spin fluctuating ones.

关键词： Antiferromagnetism Charge Magnetic susceptibility Spin liquid

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Small polarons mediated near-room-temperature metal-insulator transition in vanadium dioxide and their hopping dynamics

arXiv

引用

arXiv 2023年

作者： Liu, Xiongfang Yang, Tong Chen, Shanquan Wu, Jing Tang, Chi Sin Ning, Yuanjie Chen, Zuhuang Dai, Liang Sun, Mengxia Chen, Mingyao Han, Kun Zhou, Difan Zeng, Shengwei Sun, Shuo Li, Sensen Yang, Ming Breese, Mark B.H. Cai, Chuanbing Venkatesan, Thirumalai Wee, Andrew T.S. Yin, Xinmao Shanghai Key Laboratory of High Temperature Superconductors Institute for Quantum Science and Technology Department of Physics Shanghai University Shanghai200444 China Department of Applied Physics The Hong Kong Polytechnic University Kowloon100872 Hong Kong School of Materials Science and Engineering Harbin Institute of Technology Shenzhen518055 China 2 Fusionopolis Way Innovis #08-03 Singapore138634 Singapore National University of Singapore Singapore117603 Singapore Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Department of Electronic Engineering School of Electronic Science and Engineering Xiamen University Xiamen361005 China Department of Physics Faculty of Science National University of Singapore Singapore117542 Singapore Center for Quantum Research and Technology University of Oklahoma NormanOK73019 United States Centre for Advanced 2D Materials and Graphene Research National University of Singapore Singapore117546 Singapore

Researchers pursuing advanced photoelectric devices have discovered near room-temperature metal-insulator transitions (MIT) in non-volatile VO2. Despite theoretical investigations suggesting that polaron dynamics mediate the MIT, direct experimental evidence remains scarce. In this study, we present direct evidence of the polaron state in insulating VO2 through high-resolution spectroscopic ellipsometry measurements and first-principles calculations. We illustrate the complementary role of polaron dynamics in facilitating Peierls and Mott transitions, thereby contributing to the MIT processes. Furthermore, our observations and characterizations of conventional metallic and correlated plasmons in the respective phases of the VO2 film offer valuable insights into their electron structures. This investigation enhances comprehension of the MIT mechanism in correlated systems and underscores the roles of polarons, lattice distortions, and electron correlations in facilitating phase transition processes in strongly-correlated systems. Additionally, the detailed detection of small polarons and plasmons serves as inspiration for the development of new device functionalities. Copyright © 2023, The Authors. All rights reserved.

关键词： Vanadium dioxide

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Structural analysis of high-pressure phase for skyrmion-hosting multiferroic Cu2OSeO3

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Physical Review B 2020年第20期102卷 201106(R)-201106(R)页

作者： E. Nishibori S. Karatsu C. Terakura N. Takeshita M. Kinoshita S. Ishiwata Y. Tokura S. Seki Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba Tsukuba 305-8571 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8562 Japan Department of Applied Physics University of Tokyo Tokyo 113-8656 Japan Division of Materials Physics Graduate School of Engineering Science Osaka University Osaka 560-8531 Japan Tokyo College University of Tokyo Tokyo 113-8656 Japan Institute of Engineering Innovation University of Tokyo Tokyo 113-8656 Japan PRESTO Japan Science and Technology Agency (JST) Kawaguchi 332-0012 Japan

Cu2OSeO3 is known as a unique example of insulating multiferroic compounds with a skyrmion spin texture, which is characterized by a chiral cubic crystal structure at ambient pressure. Recently, it has been reported that this compound shows a pressure-induced structural transition with a large enhancement of magnetic ordering temperature. In the present Rapid Communication, we have investigated the detailed crystal structure in the high-pressure phase, by combining a synchrotron x-ray diffraction experiment with a diamond anvil cell and an analysis based on the genetic algorithm. Our results suggest that the original pyrochlore Cu network is sustained even after the structural transition, while the orientation of the SeO3 molecule as well as the position of oxygen in the middle of the Cu tetrahedra are significantly modified. The latter features may be the key for the reported enhancement of Tc and the associated stabilization of the skyrmion phase at room temperature.

关键词： Crystal structure Skyrmions Structural phase transition Structural properties Multiferroics Pressure techniques X-ray diffraction

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Investigation the Effect of Soft X-ray Flash Exposure on PN Diode 4

Investigation the Effect of Soft X-ray Flash Exposure on PN ...

引用

4th International Conference on applied physics and Materials Application 2019, ICAPMA 2019

作者： Chaiyasoonthorn, S. Srithanachai, I. Niemcharoen, S. Sangwaranatee, N. Electronics Technology Faculty of Science Ramkhamhaeng University Huamark Bangkapi Bangkok10240 Thailand Department of Electronics Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok10520 Thailand Applied Physics Research Group Faculty of Thailand

In this paper will present the properties of PN diode before and after expose by radiation. Although, radiation help to improve the performance of semiconductor device but still has some damage in device structure. In previous article I have showed performance improve after expose by soft radiation. The device is exposed by low frequency X-ray radiation (soft radiation flash exposure: SRFE) technique with few second for several times. In principle of PN diode after fabrication will has defects from process such as ion implantation, doped and silicon wafer process. The results show temperature while SRFE expose on device that generate high temperature on surface and silicon boundary that may the optimize energy and expose time for treatment damage of PN diode. © Published under licence by IOP Publishing Ltd.

关键词： Silicon wafers

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Hybrid In-Vivo Treatment Verification for Particle Therapy: Multivariate Modelling of Fast Neutron and Prompt Gamma-Ray Detection

Hybrid In-Vivo Treatment Verification for Particle Therapy: ...

引用

2022 IEEE Nuclear science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Pettersen, Helge E. S. Schellhammer, Sonja M. Löck, Steffen Kögler, Toni Meric, Ilker Haukeland University Hospital Department of Oncology and Medical Physics Bergen5021 Norway University Hospital Carl Gustav Carus Technische Universität Dresden OncoRay - National Center for Radiation Research in Oncology Faculty of Medicine Germany Helmholtz-Zentrum Dresden-Rossendorf Dresden Germany Faculty of Medicine University Hospital Carl Gustav Carus Technische Universität Dresden Helmholtz-Zentrum Dresden National Center for Radiation Research in Oncology Rossendorf Germany Faculty of Medicine Dresden Germany Western Norway University of Applied Sciences Department of Computer Science Electrical Engineering and Mathematical Sciences Bergen Norway

ISBN: (纸本)9781665488723

Given its sensitivity to anatomical variations, particle therapy is expected to benefit strongly from reliable on-line treatment verification. Making use of a large fraction of the secondary particles available, hybrid prompt gamma-ray and fast neutron imaging is a promising approach for this purpose. We present a simulation study introducing a novel method for range reconstruction by means of these particles. To this end, the passage of a proton beam through a patient and the detection of secondary particles in a dedicated detector array were simulated by Monte Carlo particle transport calculations. Anatomical variations were mimicked by adding or removing tissue to the patient. The secondary particle production vertices were reconstructed from the events registered by the detector based on scatter kinematics and maximum likelihood expectation maximisation. The vertices were projected onto the beam axis and the most predictive features of the resulting distributions were identified from a standardised feature set by forward feature selection and the Least Absolute Shrinkage and Selection Operator (LASSO). A range-shift sensitivity of 1 mm or less was reached at intensities of 1.2×107 protons per spot with fast neutrons, and at 2.6×107 protons per spot with prompt gamma-rays. These results demonstrate the potential of particle treatment verification by fast neutrons and prompt gamma-rays and strengthen the potential of this hybrid system for clinical application. © 2022 IEEE.

关键词： fast neutron feature selection particle therapy prompt gamma-rays Treatment verification

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Hydrogen is not necessary for superconductivity in topotactically reduced nickelates

arXiv

引用

arXiv 2024年

作者： Balakrishnan, Purnima P. Segedin, Dan Ferenc Chow, Lin Er Quarterman, P. Muramoto, Shin Surendran, Mythili Patel, Ranjan K. LaBollita, Harrison Pan, Grace A. Song, Qi Zhang, Yang El Baggari, Ismail Jagadish, Koushik Shao, Yu-Tsun Goodge, Berit H. Kourkoutis, Lena F. Middey, Srimanta Botana, Antia S. Ravichandran, Jayakanth Ariando, A. Mundy, Julia A. Grutter, Alexander J. NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Physics Harvard University CambridgeMA02138 United States Department of Physics Faculty of Science National University of Singapore Singapore117551 Singapore Material Measurement Laboratory National Institute of Standards and Technology GaithersburgMD20899 United States Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los AngelesCA90089 United States Core Center for Excellence in Nano Imaging University of Southern California Los AngelesCA90089 United States Department of Physics Indian Institute of Science Bengaluru560012 India Department of Physics Arizona State University TempeAZ85287 United States The Rowland Institute at Harvard Harvard University CambridgeMA02138 United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science IthacaNY14853 United States Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA90089 United States

A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystalline square planar nickelate films, films are prepared by the deposition of a more stable parent compound which is then transformed into the target phase via a topotactic reaction with a strongly reducing agent such as CaH2. Recent studies, both experimental and theoretical, have introduced the possibility that the incorporation of hydrogen from the reducing agent into the nickelate lattice may be critical for the superconductivity. In this work, we use secondary ion mass spectrometry to examine superconducting La1-xXxNiO2/SrTiO3 (X = Ca and Sr) and Nd6Ni5O12/NdGaO3 films, along with non-superconducting NdNiO2/SrTiO3 and (Nd,Sr)NiO2/SrTiO3. We find no evidence for extensive hydrogen incorporation across a broad range of samples, including both superconducting and non-superconducting films. Theoretical calculations indicate that hydrogen incorporation is broadly energetically unfavorable in these systems, supporting our conclusion that hydrogen incorporation is not generally required to achieve a superconducting state in layered square-planar nickelates. © 2024, CC BY.

关键词： Hydrogen

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