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Superconductivity,Pair Density Wave,and Neel Order in Cuprates

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Chinese Physics Letters 2020年第1期37卷 83-87页

作者： Li-Han Chen Da wang Yi Zhou qiang-hua wang National Laboratory of Solid State Microstructures and School of Physics Nanjing UniversityNanjing 210093 Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190 CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190

We investigate in underdoped cuprates possible coexistence of the superconducting order at zero momentum and pair density wave(PDW)at momentum Q=(Л,Л)in the presence of a Neel *** symmetry,the d-wave uniform singlet pairing dS0 can coexist with the d-wave triplet PDW dTq,and the p-wave singlet PDW pSq can coexist with the p-wave uniform triplet *** half filling,we find that the novel pSq+pT0 state is energetically more favorable than the dS0+dTQ *** finite doping,however,the dS0+dTq state is more *** both types of states,the variational triplet parameters cITq and pT0 are of secondary *** results point to a fully symmetric Z2 quantum spin liquid with spinon Fermi surface in proximity to the Neel order at zero doping,which may not be adiabatically connected to the d-wave singlet superconductivity at finite doping with intertwining d-wave triplet PDW fluctuations and spin moment *** results are obtained by variational quantum Monte Carlo simulations.

关键词： doping singlet variational

Synthesis and biological evaluation of a new series of histone deacetylases inhibitors

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Chinese Chemical Letters 2008年第6期19卷 673-675页

作者： Jie Jiao qiang wang hua Wei Zhu Hao Fang Wen Fang Xu School of Pharmaceutical Science Shandong University Jinan 250012 China

Histone deacetylases （HDACs） play an important role in tumorigenesis. Inhibition of HDACs is considered as a potent strategy for cancer therapy. Two lead compounds （ja and jb） were found to have activities against HDACs with IC50 at about 15 μmol/L. Then a new series of hydroximic acid derivatives were designed and synthesized based on them. The HDACs activity assay in vitro found that compounds J04 and ,109 are nearly as potent as the positive control drug Zolinza.

关键词： HDACs Tumorigenesis Cancer therapy Hydroximic acid

Realizing Majorana fermion modes in the Kitaev model

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Chinese Physics B 2021年第11期30卷 117-130页

作者： Lu Yang Jia-Xing Zhang Shuang Liang Wei Chen qiang-hua wang National Laboratory of Solid State Microstructures and School of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Institute of Physics Chinese Academy of SciencesBeijing 100190China

We study the possibility to realize a Majorana zero mode that is robust and may be easily manipulated for braiding in quantum computing in the ground state of the Kitaev model in this *** achieve this we first apply a uniform[111]magnetic field to the gapless Kitaev model and turn the Kitaev model to an effective p+ip topological superconductor of *** then study possible vortex binding in such system to a topologically trivial spot in the ground *** consider two cases in the system:one is a vacancy and the other is a fully polarized *** show that in both cases,the system binds a vortex with the defect and a robust Majorana zero mode in the ground state at a weak uniform[111]magnetic *** distribution and asymptotic behavior of these Majorana zero modes are *** Majorana zero modes in both cases decay exponentially in space,and are robust against local perturbations and other Majorana zero modes far away,which makes them promising candidates for braiding in topological quantum computing.

关键词： Kitaev model Majorana fermion modes topological quantum computing

Effect of Anisotropic Impurity Scattering in D-Wave Superconductors

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Chinese Physics Letters 2023年第5期40卷 83-87页

作者：王泽龙毛瑞盈王达王强华 National Laboratory of Solid State Microstructures&School of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

In d_(x^(2)-y^(2))-wave superconductors,the effect of s-wave point disorder has been extensively studied in *** study the anisotropic disorder in the form of V_(kk')^(imp)=V_(if)_(kf)_(k')with f_(k)=cos(2θ)(θthe azimuthal angle of k),as proposed to be caused by apical oxygen vacancies in overdoped La-based cuprate films,under the Born *** disorder self-energy and d-wave pairing affect each other and must be solved simultaneously *** find that the self-energy is reduced at low frequencies and thus weakens the pair-breaking *** frequency dependence vanishes in the dirty limit for which the disorder is well described by a scattering rateΓ_(k)=Γ_(if)_(k)^(2).One consequence of the disorder effect is that the gap-to-T_c ratio 2Δ(0)/T_(c) is greatly enhanced by the d-wave disorder,much larger than the s-wave disorder and the clean BCS value ***,we generalize the d-wave scattering rate to a general formΓ_(θ)=Γ_α|θ-θ_(0)|^(α) around each nodal direction θ_(0).We find the density of statesρ(ω)-ρ(0)∝|ω|(ω^(2)) for allα≥1(α<1)in the limit ofω→*** a result,the superfluid densityρ_(s) exhibits two and only two possible scaling behaviors:ρ_(s)(0)-ρ_(s)(T)∝T(T^(2))forα≥1(α<1)in the low temperature limit.

关键词： effect limit breaking

Scalability of dark current in silicon PIN photodiode

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Chinese Physics B 2018年第4期27卷 526-528页

作者： Ya-Jie Feng Chong Li Qiao-Li Liu hua-qiang wang An-Qi Hu Xiao-Ying He Xia Guo School of Electronic Engineering State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing 100876 China Department of Information Beijing University of Technology Beijing 100124 China

The mechanism for electrical conduction is investigated by the dark temperature-dependent current–voltage characteristics of Si PIN photodiodes with different photosensitive *** characteristic tunneling energy E（00） can be obtained to be 1.40 me V,1.53 me V,1.74 me V,1.87 me V,and 2.01 me V,respectively,for the photodiodes with L = 0.25 mm,0.5 mm,1 mm,1.5 mm,and 2 mm by fitting the ideality factor n versus temperature curves according to the tunneling-enhanced recombination *** trap-assisted tunneling-enhanced recombination in the i-layer plays an important role in our device,which is consistent with the experimental result that area-dependent leakage current is dominant with the side length larger than 1 mm of the photosensitive *** results reveal that the quality of the bulk material plays an important role in the electrical conduction mechanism of the devices with the side length larger than 1 mm of the photosensitive area.

关键词： silicon PIN photodiodes dark current tunneling enhanced

Monolayer NbF:a 4d-analogue of cuprates

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Science Bulletin 2020年第22期65卷 1901-1906,M0004页

作者： Yang Yang Wan-Sheng wang Chin-Sen Ting qiang-hua wang Texas Center for Superconductivity and Department of Physics University of HoustonHouston TX77204USA College of Physics and Electronic Engineering Zhengzhou University of Light IndustryZhengzhou 450002China Department of Physics Ningbo UniversityNingbo 315211China National Laboratory of Solid State Microstructures&School of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

The electronic structure and possible electronic orders in monolayer NbF4 are investigated by density functional theory and functional renormalization *** of the niobium-centered octahedra,the energy band near the Fermi level is found to derive from the 4 dxyorbital,well separated from the other *** Coulomb interaction drives the undoped system into an antiferromagnetic *** suitable electron/hole doping,the system is found to develop dx2à-y2 wave superconductivity with sizable transition ***,the monolayer NbF4 may be an exciting 4d1 analogue of cuprates,providing a new two-dimensional platform for high-Tc superconductivity.

关键词： Cuprates Two-dimensional superconductors d-wave pairing Electronic structure calculations

Early liver retransplantation versus late liver retransplantation： analysis of a single-center experience

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Chinese Medical Journal 2008年第20期121卷 1992-1996页

作者： CHEN Gui-hua FU Bin-sheng YANG Yang CAI Chang-jie LU Min-qiang LI hua wang Gen-shu YI Shu-hong XU Chi ZHANG Jun-feng ZHANG Tong wang Guo-ying Liver Transplantation Center Third Affiliated Hospital of Sun Yat-sen University Transplantation Research Institute of Sun Yat-sen University Guangzhou Guangdong 510630 China

Background Orthotopic liver retransplantation （re-OLT） is the only effective therapy for irreversible failure of a liver graft. Early and late graft failure gives way to two different clinical conditions that should be discussed separately. This study was designed to compare early and late re-OLT for patients with poor graft function after primary transplantation at our center and sum up our clinical experience in re-OLT. Methods The clinical data of 31 re-OLTs at our center from January 2004 to February 2007 were analyzed retrospectively, consisting of the first group with 14 cases of early re-OLT and the second group with 17 cases of late re-OLT.Results Biliary tract complications were the main indications for early re-OLT （57.1%） and late re-OLT （52.9%）. Other common indications were vascular complications in early re-OLT and recurrence of primary diseases in late re-OLT. No significant differences were found between the groups with regard to the volume of bleeding during operation, cold ischemia time, operative duration, and perioperative mortality; except for the model of end-stage liver disease （MELD） score. Outcome was fatal for 7 patients in early re-OLT and 9 patients in late re-OLT. Two deaths were due to multiple organ failure with 3 deaths due to severe sepsis-related disease in early re-OLT, and 4 deaths were due to severe sepsis-related disease with 3 deaths due to recurrence of hepatocellular carcinoma （HCC） in late re-OLT. One and 2-year actuarial survival rates after re-OLT were 55.2% and 36.9%, respectively, for patients in early re-OLT, and 65.1% and 52% respectively, for patients in late re-OLT. No significant differences were found regarding survival rates between the two groups. Conclusions Similar clinical results can be achieved in early and late re-OLT. Proper indications and optimal operation timing, adequate preoperative preparation, experienced surgical procedures, and effective perioperative anti-infection strategy contribute to th

关键词： liver transplantation retransplantation survival rate

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei Cao qiang wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

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基于图像矩的眼注视研究

同济大学学报（自然科学版） 2001年第2期29卷 169-174页

作者：徐强华林靖王月娟同济大学信息与控制工程系上海200092

利用图像的全局特征描述子—图像矩特征作为图像特征信息 ,从而构成视觉伺服 ,实现对动目标的注视跟踪 .俯仰由末端执行器完成 .摇摆由腰的旋转完成 .最后给出了实验结果 ,表明了矩特征的有效性以及五自由度机器人实现注视跟踪的可能性 .

关键词：视学伺服图像雅可比矩阵图像矩注视跟踪机器人视觉图像特征信息