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Inclusion of infrared dielectric screening in the GW method from polaron energies to charge mobilities

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npj Computational Materials 2022年第1期8卷 1300-1307页

作者： Paolo Umari dipartimento di fisica e astronomia Universitàdi Padovavia Marzolo 8I-35131PadovaItaly CNR-IOM Istituto Officina Dei Materiali Consiglio Nazionale Delle RicercheArea Science ParkStrada Statale 14km 163.5I-34149TriesteItaly

We introduce in the many-body GW scheme the modulation of the screened Coulomb interaction W arising from the macroscopic dielectric response in the *** derive expressions for the polaron binding energies,the renormalization of the effective masses and for the electron and hole relaxation *** and hole mobilities are then obtained from the incorporation of appropriate scattering ***-blende GaN and orthorhombic MAPbI3 are used as test beds finding fair agreement with results from rigorous electron-phonon coupling *** limited to polar phonons,our method has a negligible computational cost.

关键词： dielectric polaron negligible

Tight-binding models for ultracold atoms in optical lattices：general formulation and applications

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Science China(Physics,Mechanics & Astronomy) 2016年第6期59卷 1-23页

作者： Michele Modugno Julen Ibanez-Azpiroz Giulio Pettini Departamento de fisica Teorica e Historia de la Ciencia Universidad del Pais Vasco UPV/EHU Bilbao 48080 Spain IKeRBASQUe Basque Foundation for Science Bilbao 48011 Spain Peter Griinberg Institute and Institute for Advanced Simulation Forschungszentrum Jiilich & JARA Jiilich D-52425 Germany dipartimento di fisica e astronomia Universita di Firenze and INFN Sesto Fiorentino 50019 Italy

Tight-binding models for ultracold atoms in optical lattices can be properly defined by using the concept of maximally localized Wannier functions for composite bands. The basic principles of this approach are reviewed here, along with different applications to lattice potentials with two minima per unit cell, in one and two spatial dimensions. Two independent methods for computing the tight-binding coefficients—one ab initio, based on the maximally localized Wannier functions, the other through analytic expressions in terms of the energy spectrum—are considered. In the one dimensional case, where the tight-binding coefficients can be obtained by designing a specific gauge transformation, we consider both the case of quasi resonance between the two lowest bands, and that between s and p orbitals. In the latter case, the role of the Wannier functions in the derivation of an effective dirac equation is also reviewed. Then, we consider the case of a two dimensional honeycomb potential, with particular emphasis on the Haldane model, its phase diagram, and the breakdown of the Peierls substitution. Tunable honeycomb lattices, characterized by movable dirac points, are also considered. Finally, general considerations for dealing with the interaction terms are presented.

关键词： ultracold atoms optical lattices tight-binding models Wannier functions effective dirac equation honeycomb lattices

Nuclear liquid-gas phase transition within a Brueckner-Hartree-Fock approach

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Chinese Physics C 2022年第11期46卷 231-237页

作者： Jing Zhang Hong-Ming Liu Zeng-Hua Li G.F.Burgio H.-J.Schulze Institute of Modern Physics Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)Fudan UniversityShanghai 200433China INFN Sezione di Catania Dipartimento di Fisica e AstronomiaUniversitàdi CataniaVia S.Sofia 64I-95123 CataniaItaly

The critical parameters of the liquid-gas phase transition of symmetric nuclear matter are computed using the Brueckner-Hartree-Fock method at finite temperature by employing different realistic nucleon-nucleon *** effects on single-particle potentials,defect functions,and three-body forces are discussed in *** obtained from the full procedure and frozen-correlations approximation are *** find critical temperatures of approximately 14 to 19 MeV and critical densities in the range of 0.05 to 0.08fm^(-3),depending on the interactions employed.

关键词： nuclear liquid-gas phase transition Brueckner-Hartree-Fock approach symmetric nuclear matter

Thermal management for the underwater frontend and readout electronics of JUNO 20‑inch PMTs

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Radiation Detection Technology and Methods 2023年第3期7卷 418-426页

作者： Yangfu Wang Xiaoshan Jiang Jun Hu Peiliang Wang Lei Fan Shaojing Hou Zhe Ning Yunhua Sun Xiongbo Yan Zheng Wang Ziyue Yan Peiran Ye Jie Zhang Alberto Garfagnini Antonio Bergnoli Riccardo Brugnera Beatrice Jelmini Filippo Marini Marco Grassi Mariia Redchuk Andrea Serafini Katharina von Sturm Institute of High energy Physics BeijingChina University of China Academy of Sciences Beijing 100049China INFN Sezione di Padova PaduaItaly dipartimento di fisica e astronomia Universita di PadovaPaduaItaly

Background The Jiangmen underground neutrino observatory(JUNO)is a new generation of long-term operation neutrino experimental platform under construction in Jiangmen,Guangdong province of southern *** underwater frontend and readout electronics(F&R electronics)are placed nearby the 20-inch PMTs and readout current signals from three *** electronics are sealed in a stainless-steel underwater box to keep them dry,and temperature control of the electronics plays a significant role in their *** A conductive cooling structure based on the passive cooling method is designed for the 20-inch PMT F&R *** numerical simulation and experimental tests were performed to evaluate the cooling structures'thermal *** The results show that the case temperature of the respective chip for 20-inch PMT F&R electronics is less than 30℃in ambient still *** The case temperature of the respective chip meets the strict temperature requirement for the F&R *** JUNO collaboration has adopted this cooling structure for the 20-inch PMT readout electronics.

关键词： Thermal management JUNO PMT electronics

Pulsed Laser Annealed Ga Hyperdoped Poly-Si/SiO_(x)Passivating Contacts for High-efficiency Monocrystalline Si Solar Cells

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energy & environmental Materials 2023年第3期6卷 388-399页

作者： Kejun Chen enrico Napolitani Matteo De Tullio Chun-Sheng Jiang Harvey Guthrey Francesco Sgarbossa San Theingi William Nemeth Matthew Page Paul Stradins Sumit Agarwal David L.Young Colorado School of Mines 1500 Illinois StGolden Colorado 80401USA dipartimento di fisica e astronomia and CNR-IMM Universit`a degli Studi di Padovavia Marzolo 8PadovaItaly National Renewable energy Laboratory 15013 Denver West ParkwayGolden Colorado 80401USA

Polycrystalline Si(poly-Si)-based passivating contacts are promising candidates for high-efficiency crystalline Si solar *** show that nanosecond-scale pulsed laser melting(PLM)is an industrially viable technique to fabricate such contacts with precisely controlled dopant concentration profiles that exceed the solid solubility *** demonstrate that conventionally doped,hole-selective poly-Si/SiO_(x)contacts that provide poor surface passivation of c-Si can be replaced with Ga-or B-doped contacts based on non-equilibrium *** overcome the solid solubility limit for both dopants in poly-Si by rapid cooling and recrystallization over a timescale of∼25 *** show an active Ga dopant concentration of∼3×10^(20)cm^(−3)in poly-Si which is six times higher than its solubility limit in c-Si,and a B dopant concentration as high as∼10^(21) cm^(−3).We measure an implied open-circuit voltage of 735 mV for Ga-doped poly-Si/SiO_(x)contacts on Czochralski Si with a low contact resistivity of 35.5±2.4 mΩcm^(2).Scanning spreading resistance microscopy and Kelvin probe force microscopy show large diffusion and drift current in the p-n junction that contributes to the low contact *** results suggest that PLM can be extended for hyperdoping of other semiconductors with low solubility atoms to enable high-efficiency devices.

关键词： Ga hyperdoping Ga passivating contacts poly-Si/SiO_(x) pulsed laser melting silicon solar cell

Theoretical Studies of Proton Radioactivity

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原子核物理评论 2016年第2期33卷 184-189页

作者： Lidia S. Ferreira enrico Maglione Centro de fisica e engenharia de Materiais CeFeMA and Departmento de fisica Instituto Superior Tecnico Universidade de Lisboa Av Rovisco Pals 1049 001 Lisboa Portugal dipartimento di fisica e astronomia "G. Galilei" Via Marzolo 8 1-35131 Padova Italy Istituto Nazionale di Fisica Nucleate Padova Italy

In the paper, we will discuss the most recent theoretical approaches developed by our group,to understand the mechanisms of decay by one proton emission, and the structure and shape of exotic nuclei at the limits of s... 详细信息

关键词： proton radioactivity drip-line nuclear density functional theory

The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources(Ⅲ)

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Research in Astronomy and Astrophysics 2020年第2期20卷 101-111页

作者： Zhi-Yuan Pei Jun-Hui Fan Denis Bastieri Jiang-He Yang Hu-Bing Xiao Wen-Xin Yang Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of education of Guangdong Province Guangzhou 510006China dipartimento di fisica e astronomia“G.Galilei” Universita di Padova1-35131 PadovaItaly Istituto Nazionale di fisica Nucleare Sezione di Padova1-35131 PadovaItaly Department of Physics and electronics Science Hunan University of Arts and ScienceChangde 415000China

Active galactic nuclei(AGNs) can be divided into two major classes,namely radio-loud and radio-quiet AGNs.A small subset of the radio-loud AGNs is called blazars,which are believed to be unified with Fanaroff-Riley type Ⅰ and type Ⅱ(FRI&Ⅱ) radio *** our previous work,we present a latest sample of 966 sources with measured radio flux densities of the core and extended *** sample includes 83 BL Lacs,473 flat spectrum radio quasars,101 Seyferts,245 galaxies,52 FRIs&Ⅱs and12 unidentified *** then calculate the radio core-dominance parameters and spectral indices and study their *** analysis shows that the core-dominance parameters and spectral indices are quite different for different types of *** also confirm that the correlation between core-dominance parameter and radio spectral index extends over all the sources in a large sample presented.

关键词： galaxies:active galaxies:general galaxies:jets quasars:general

Deconfinement phase transition in neutron star matter

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Chinese Physics C 2009年第S1期33卷 61-63页

作者：李昂彭光雄 Lombardo U Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen University dipartimento di fisica e astronomia Catania University China Center of Advanced Science and Technology (World Laboratory) Institute of High energy Physics Chinese Academy of Sciences Phys. Depart. of Graduate University Chinese Academy of Sciences Laboratori Nazionali del Sud Istituto Nazionale di Fisica Nucleare

The transition from hadron phase to strange quark phase in dense matter is investigated. Instead of using the conventional bag model in quark sect, we achieve the confinement by a density-dependent quark mass derived from in-medium chiral condensates, with a thermodynamic problem improved. In nuclear slot, we adopt the equation of state from Brueckner-Bethe-Goldstone approach with three-body force. It is found that the mixed phase can occur, for reasonable confinement parameter, near the normal saturation density, and transit to pure quark matter at 4—5 times the saturation, which is quite different from the previous results from other quark models that pure quark phase can not appear at neutron-star densities.

关键词： phase transition the density-dependent quark model three-body force

Mean-field effects on matter and antimatter elliptic flow

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Nuclear Science and Techniques 2013年第5期24卷 132-139页

作者： KO Cheming CHeN Liewen GReCO Vincenzo LI Feng LIN Ziwei PLUMARI Salvatore SONG Taesoo XU Jun Cyclotron Institute and Department of Physics and Astronomy Texas A & M UniversityCollege Station Department of Physics Shanghai Jiao Tong University dipartimento di fisica e astronomia Universitá di CataniaVia S.Sofia 64 Department of Physics East Carolina UniversityC-209 Howell Science ComplexGreenville Shanghai Institute of Applied Physics Chinese Academy of Sciences

We report our recent work on mean-field potential effects on the elliptic flows of matters and antimatters in heavy ion collisions leading to the production of a baryon-rich *** the framework of a multiphase transport(AMPT) model that includes both initial partonic and final hadronic interactions,we have found that including mean-field potentials in the hadronic phase leads to a splitting of the elliptic flows of particles and their antiparticles,providing thus a plausible explanation of the different elliptic flows between p and anti-p,K+and K-,and π+ and π- observed by the STAR Collaboration in the Beam energy Scan(BeS) program at the Relativistic Heavy Ion Collider(RHIC).Using a partonic transport model based on the Nambu-Jona-Lasinio(NJL) model,we have also studied the effect of scalar and vector mean fields on the elliptic flows of quarks and antiquarks in these *** quarks and antiquarks at hadronization to hadrons via the quark coalescence model,we have found that the elliptic flow differences between particles and antiparticles also depend on the strength of the quark vector coupling in baryon-rich quark-gluon plasma,providing thus the possibility of extracting information on the latter's properties from the BeS program at RHIC.

关键词：椭圆流平均场反物质强子相互作用重离子碰撞重离子对撞机输运模型 RHIC