检索结果-内蒙古大学图书馆

Phase transitions in the frustrated Ising ladder with stoquastic and nonstoquastic catalysts

Physical Review Research 2021年第4期3卷 043013-043013页

作者： Kabuki Takada Shigetoshi Sota Seiji Yunoki Bibek Pokharel Hidetoshi Nishimori Daniel A. Lidar Department of Physics Tokyo Institute of Technology Yokohama Kanagawa 226-8503 Japan Computational Materials Science Research Team RIKEN Center for Computational Science (R-CCS) Kobe Hyogo 650-0047 Japan Computational Condensed Matter Physics Laboratory RIKEN Cluster for Pioneering Research (CPR) Wako Saitama 351-0198 Japan Computational Quantum Matter Research Team RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351-0198 Japan Department of Physics University of Southern California Los Angeles California 90089 USA Center for Quantum Information Science & Technology University of Southern California Los Angeles California 90089 USA Institute of Innovative Research Tokyo Institute of Technology Yokohama Kanagawa 226-8503 Japan Graduate School of Information Sciences Tohoku University Sendai Miyagi 980-8579 Japan RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) Wako Saitama 351-0198 Japan Department of Electrical & Computer Engineering and Department of Chemistry University of Southern California Los Angeles California 90089 USA

The role of nonstoquasticity in the field of quantum annealing and adiabatic quantum computing is an actively debated topic. We study a strongly-frustrated quasi-one-dimensional quantum Ising model on a two-leg ladder to elucidate how a first-order phase transition with a topological origin is affected by interactions of the ±XX-type. Such interactions are sometimes known as stoquastic (negative sign) and nonstoquastic (positive sign) “catalysts”. Carrying out a symmetry-preserving real-space renormalization group analysis and extensive density-matrix renormalization group computations, we show that the phase diagrams obtained by these two methods are in qualitative agreement with each other and reveal that the first-order quantum phase transition of a topological nature remains stable against the introduction of both XX-type catalysts. This is the first study of the effects of nonstoquasticity on a first-order phase transition between topologically distinct phases. Our results indicate that nonstoquastic catalysts are generally insufficient for removing topological obstacles in quantum annealing and adiabatic quantum computing.

关键词： Adiabatic quantum optimization Phase transitions by order Quantum spin models Density matrix renormalization group Renormalization group

来源：评论

学校读者我要写书评

暂无评论

Periodontal Ligament Cell Sheets and RGD-Modified Chitosan Improved Regeneration in the Horizontal Periodontal Defect Model

引用

European Journal of Dentistry 2020年第2期14卷 306-314页

作者： Amir, Lisa R. Soeroso, Yuniarti Fatma, Dewi Sunarto, Hari Sulijaya, Benso Idrus, Erik Rahdewati, Herlis Tjokrovonco, Angelia M. Izumi, Kenji Abbas, Basril Latief, Fourier D. E. Department of Oral Biology Faculty of Dentistry Universitas Indonesia Jakarta Indonesia Department of Periodontology Faculty of Dentistry Universitas Indonesia Jakarta Indonesia Division of Periodontology Department of Oral Biological Science Faculty of Dentistry Niigata University Niigata Japan Periodontology Residency Program Faculty of Dentistry Universitas Indonesia Jakarta Indonesia Division of Biomimetics Niigata University Graduate School of Medical and Dental Sciences Niigata Japan Tissue Bank Indonesia National Atomic Energy (BATAN) Indonesia Physics of Complex Systems Faculty of Mathematics and Natural Sciences Bandung Institute of Technology Bandung Indonesia

Objective The aim of this study was to examine the potential of periodontal ligament (PDL) cells sheet and arginine-glycyl-aspartic acid (RGD)-modified chitosan scaffold for periodontal tissue regeneration in horizontal periodontal defect model. Materials and Methods PDL cell cytotoxicity was tested with 3-[4,5- dimethylthiazol-2yl]-2,5-diphenyl-2H-tetrazolium bromide assay. Cell migration toward the chitosan-based materials was analyzed with trans-well migration assay. Horizontal periodontal defect model was created in four maxillary and mandibular lateral incisors of Macaque nemestrina. Following periodontal therapy, the sites were transplanted with various regenerative materials: (1) chitosan, (2) RGD-modified chitosan, (3) PDL cell sheet with chitosan, (4) PDL cell sheet with RGD-modified chitosan. The periodontal tissue regeneration was evaluated clinically and radiographically. Gingival crevicular fluids were collected each week to evaluate cementum protein-1 (CEMP-1) expression with enzyme-linked immunosorbent assay, while the biopsies were retrieved after 4 weeks for histological and microcomputed tomography evaluation. Statistical Analysis Data was statistically analyzed using GraphPad Prism 6 for MacOS X. Normality was tested using the Shapiro-Wilk normality test. The Kruskal-Wallis test was used to compare the groups. Significance was accepted when p < 0.05. Results Clinical examination revealed more epithelial attachment was formed in the group with PDL cell sheet with RGD-modified chitosan. Similarly, digital subtraction radiography analysis showed higher gray scale, an indication of higher alveolar bone density surrounded the transplanted area, as well as higher CEMP-1 protein expression in this group. The incorporation of RGD peptide to chitosan scaffold in the group with or without PDL cells sheet reduced the distance of cement-enamel junction to the alveolar bone crest;hence, more periodontal tissue formed. Conclusions Horizontal periodontal defect

关键词： arginine-glycyl-aspartic acid chitosan horizontal periodontal defect periodontal cell sheet periodontal tissue regeneration

来源：评论

学校读者我要写书评

暂无评论

ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - XIX. The origin of SiO emission

arXiv

引用

arXiv 2024年

作者： Liu, Rong Liu, Tie Jiménez-Serra, Izaskun Li, Jin-Zeng Martín-Pintado, Jesús Liu, Xunchuan Lee, Chang Won Sanhueza, Patricio Chibueze, James O. Rivilla, Víctor M. Juvela, Mika Colzi, Laura Bronfman, Leonardo Liu, Hong-Li Sanz-Novo, Miguel López-Gallifa, Álvaro Li, Shanghuo Megías, Andrés Andrés, David San Garay, Guido Hwang, Jihye Zhou, Jianwen Xu, Fengwei Martínez-Henares, Antonio Saha, Anindya Nazeer, Hafiz National Astronomical Observatories of China Chinese Academy of Sciences Beijing100012 China University of Chinese Academy of Sciences Beijing100049 China Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China CSIC-INTA Carretera de Ajalvir km 4 Torrejón de Ardoz28850 Spain Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejeon34055 Korea Republic of 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Mathematical Sciences University of South Africa Cnr Christian de Wet Rd and Pioneer Avenue Florida Park Roodepoort1709 South Africa Department of Physics and Astronomy Faculty of Physical Sciences University of Nigeria Carver Building 1 University Road Nsukka410001 Nigeria Department of Physics University of Helsinki P.O. Box 64 FI-00014 Finland Departamento de Astronomía Universidad de Chile Las Condes Santiago Chile School of Physics and Astronomy Yunnan University Kunming650091 China Max Planck Institute for Astronomy Königstuhl 17 HeidelbergD-69117 Germany Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 Bonn53125 Germany Kavli Institute for Astronomy and Astrophysics Peking University Haidian District Beijing100871 China Department of Astronomy School of Physics Peking University Beijing100871 China Indian Institute of Space Science and Technology Kerala Thiruvananthapuram695 547 India Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China

The production of silicon monoxide (SiO) can be considered as a fingerprint of shock interaction. In this work, we use high-sensitivity observations of the SiO (2-1) and H13CO+ (1-0) emission to investigate the broad and narrow SiO emission toward 146 massive star-forming regions in the ATOMS survey. We detected SiO emission in 136 regions and distinguished broad and narrow components across the extension of 118 sources (including 58 UC Hii regions) with an average angular resolution of 2.5′′. The derived SiO luminosity (LSiO) across the whole sample shows that the majority of LSiO (above 66%) can be attributed to broad SiO, indicating its association with strong outflows. The comparison of the ALMA SiO images with the filamentary skeletons identified from H13CO+ and in the infrared data (at 4.5, 8, and 24 µm), further confirms that most SiO emission originates from outflows. However, note that for nine sources in our sample, the observed SiO emission may be generated by expanding UC Hii regions. There is a moderate positive correlation between the bolometric luminosity (Lbol) and LSiO for both components (narrow and broad). The UC Hii sources show a weaker positive correlation between Lbol and LSiO and higher LSiO compared to the sources without UC Hii regions. These results imply that the SiO emission from UC Hii sources might be affected by UV-photochemistry induced by UC Hii regions. © 2024, CC BY.

关键词： Giant stars

来源：评论

学校读者我要写书评

暂无评论

Memory seeds enable high structural phase purity in 2D perovskite films for high-efficiency devices

Research Square

引用

Research Square 2021年

作者： Sidhik, Siraj Li, Wenbin Samani, Mohammad H.K. Zhang, Hao Wang, Yafei Hoffman, Justin Fehr, Austin K. Wong, Michael Katan, Claudine Even, Jacky Marciel, Amanda B. Kanatzidis, Mercouri G. Blancon, Jean-Christophe Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States UMR 6226 RennesF-35000 France Univ Rennes INSA Rennes CNRS Institut FOTON UMR 6082 RennesF-35000 France

Two-dimensional (2D) perovskites are a class of halide perovskites offering a pathway for realizing efficient and durable optoelectronic devices. However, the broad chemical phase space and lack of understanding of film formation have led to quasi-2D perovskite films with polydispersity in perovskite layer thicknesses, which have hindered devices performance and stability. Here, we demonstrate a scalable approach involving dissolution of single-phase crystalline powders with homogeneous perovskite layer thickness in desired solvents, to fabricate 2D perovskite thin-films with high phase purity. In-situ characterizations reveal the presence of sub-micron-sized seeds in solution that preserve the memory of the dissolved single-crystals and dictate the nucleation and growth of grains with identical thickness of the perovskite layers in thin-films. Photovoltaic devices fabricated with such films, yields an efficiency of 17.1% and 1.20V open-circuit voltage, while preserving 97.5% of their peak-performance after 800 hours under illumination without any external thermal management. © 2021, CC BY.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

arXiv

引用

arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

来源：评论

学校读者我要写书评

暂无评论

Incommensurate magnetic orders and topological Hall effect in the square-net centrosymmetric EuGa2Al2 system

arXiv

引用

arXiv 2021年

作者： Moya, Jaime M. Lei, Shiming Clements, Eleanor M. Kengle, Caitlin S. Sun, Stella Allen, Kevin Li, Qizhi Peng, Y.Y. Husain, Ali A. Mitrano, Matteo Krogstad, Matthew J. Osborn, Raymond Puthirath, Anand B. Chi, Songxue Debeer-Schmitt, L. Gaudet, J. Abbamonte, P. Lynn, Jeffrey W. Morosan, E. Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States NIST Center for Neutron Research National Institute of Standards and Technology GaithersburgMD20899 United States Department of Physics University of Illinois at Urbana-Champaign UrbanaIL United States International Center for Quantum Materials School of Physics Peking University BeijingCN-100871 China Department of Physics and Astronomy Quantum Matter Institute University of British Columbia VancouverBCV6T 1Z1 Canada Department of Physics Harvard University CambridgeMA02138 United States Materials Science Division Argonne National Laboratory LemontIL United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Materials Science and Eng. University of Maryland College ParkMD20742-2215 United States

Neutron diffraction on the centrosymmetric square-net magnet EuGa2Al2 reveals multiple incommensurate magnetic states (AFM1,2,3) in zero field. In applied field, a new magnetic phase (A) is identified from magnetization and transport measurements, bounded by two of the µ0H = 0 incommensurate magnetic phases (AFM1,helical and AFM3, cycloidal) with different moment orientations. Moreover, magneto-transport measurements indicate the presence of a topological Hall effect, with maximum values centered in the A phase. Together, these results render EuGa2Al2 a material with non-coplanar or topological spin texture in applied field. X-ray diffraction reveals an out-of-plane (OOP) charge density wave (CDW) below TCDW ∼ 50 K while the magnetic propagation vector lies in plane below TN = 19.5 K. Together these data point to a new route to realizing in-plane non-collinear spin textures through an OOP CDW. In turn, these non-collinear spin textures may be unstable against the formation of topological spin textures in an applied field. © 2021, CC BY.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Temporal parity-time symmetry for extreme energy transformations

arXiv

引用

arXiv 2021年

作者： Li, Huanan Yin, Shixiong Galiffi, Emanuele Alù, Andrea Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Department of Electrical Engineering City College of The City University of New York New York10031 United States Blackett Laboratory Imperial College London LondonSW7 2AZ United Kingdom Physics Program Graduate Center City University of New York New YorkNY10016 United States

Temporal interfaces introduced by abrupt switching of the constitutive parameters of unbounded media enable unusual wave phenomena. So far, their explorations have been mostly limited to lossless media. Yet, non-Hermitian phenomena leveraging material loss and gain, and their balanced combination in parity-time (PT)-symmetric systems, have been opening new vistas in photonics. Here, we unveil the role that temporal interfaces offer in non-Hermitian physics, introducing the dual of PT symmetry for temporal boundaries. Our findings reveal unexplored interference mechanisms enabling extreme energy manipulation, and open new scenarios for time-switched metamaterials, connecting them with the broad opportunities offered by non-Hermitian phenomena. Copyright © 2021, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Lepton number violation in a unified framework

arXiv

引用

arXiv 2020年

作者： Kawamura, Yuta Matsuo, Yamato Morozumi, Takuya Adam, Apriadi Salim Shimizu, Yusuke Tokunaga, Yuya Toyota, Naoya Graduate School of Science Hiroshima University Higashi-Hiroshima739-8526 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8526 Japan Core of Research for the Energetic Universe Hiroshima University Higashi-Hiroshima739-8526 Japan Gunung Sari RT.02 RW.24 Kelurahan Ngringo Kecamatan Jaten Kabupaten Karanganyar Jawa Tengah57731 Indonesia

We study the time evolution of lepton family number for neutrino which forms SU(2) doublet with charged lepton. The lepton family number is defined through a weak basis of SU(2) doublet in which the charged lepton mass matrix is a real and diagonal one. The lepton family number carried by the neutrino is defined with a left-handed current of the neutrino family. We study the time evolution of the lepton family number operator for Majorana neutrino. To be definite, we introduce the mass term at t = 0 and study the time evolution of the lepton family number for the later time. Since the operator in flavor eigenstate is continuously connected to that of the mass eigenstate, the creation and annihilation operators for flavor eigenstates are related to those of mass eigenstates. The total lepton number of the Majorana neutrino is conserved. By choosing a specific flavor eigenstate of neutrino as an initial state, we compute the time evolution of all lepton family numbers. They are sensitive to Majorana and Dirac phases and also are sensitive to the absolute mass and mass hierarchy of neutrinos. Copyright © 2020, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The thickness dependence of quantum oscillations in ferromagnetic Weyl metal SrRuO3

引用

npj Quantum Materials 2023年第1期8卷 1-10页

作者： Uddipta Kar Akhilesh Kr. Singh Chih-Yu Lin Bipul Das Cheng-Tung Cheng Wei-Li Lee Yu-Te Hsu M. Berben S. Wiedmann Song Yang Chun-Yen Lin Chia-Hung Hsu Wei-Cheng Lee Institute of Physics Academia Sinica Nankang Taipei 11529 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica and National Taiwan university Taipei Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan High Field Magnet Laboratory (HFML-EMFL) Radboud University Toernooiveld 7 6525 ED Nijmegen The Netherlands Radboud University Institute for Molecules and Materials Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands Scientific Research Division National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Department of Physics Applied Physics and Astronomy Binghamton University Binghamton NY 13902 USA

In a thin Weyl semimetal, a thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from a nonlocal cyclotron orbit via electron tunnelings between top and bottom Fermi-arc surface states. Here, magneto-transport measurements were carried out on untwinned Weyl metal SrRuO3thin films. In particular, quantum oscillations with a frequencyFs1≈ 30 T were identified, corresponding to a small Fermi pocket with a light effective mass. Its oscillation amplitude appears to be at maximum for thicknesses in a range of 10 to 20 nm, and the phase of oscillation exhibits a systematic change with film thickness. The constructed Landau fan diagram shows an unusual concave downward curvature in the 1/μ0Hn-ncurve, wherenis the Landau level index. From thickness and field-orientation dependence, theFs1oscillation is attributed to be of surface origin. Those findings can be understood within the framework of the Weyl-orbit quantum oscillation effect with non-adiabatic corrections.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Reconstructing positive and negative couplings in Ising spin networks by sorted local transfer entropy

引用

Physical Review E 2019年第1期100卷 012121-012121页

作者： Felix Goetze Pik-Yin Lai Department of Physics and Center for Complex Systems National Central University Chung-Li District Taoyuan City 320 Taiwan Republic of China and Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei Taiwan Republic of China

We employ the sorted local transfer entropy (SLTE) to reconstruct the coupling strengths of Ising spin networks with positive and negative couplings (Jij), using only the time-series data of the spins. The SLTE method is model-free in the sense that no knowledge of the underlying dynamics of the spin system is required and is applicable to a broad class of systems. Contrary to the inference of coupling from pairwise transfer entropy, our method can reliably distinguish spin pair interactions with positive and negative couplings. The method is tested for the inverse Ising problem for different Jij distributions and various spin dynamics, including synchronous and asynchronous update Glauber dynamics and Kawasaki exchange dynamics. It is found that the pairwise SLTE is proportional to the pairwise coupling strength to a good extent for all cases studied. In addition, the reconstruction works well for both the equilibrium and nonequilibrium cases of the time-series data. Comparison to other inverse Ising problem approaches using mean-field equations is also discussed.

关键词： Information theory Ising model Time series analysis

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：