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Charge density wave and weak Kondo effect in a Dirac semimetal CeSbTe

Science China(Physics,Mechanics & Astronomy) 2021年第3期64卷 90-98页

作者： Peng Li BaiJiang Lv Yuan Fang Wei Guo ZhongZheng Wu Yi Wu DaWei Shen YueFeng Nie luca petaccia Chao Cao Zhu-An Xu Yang Liu Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Center for Correlated Matter Zhejiang UniversityHangzhou 310058China National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Elettra Sincrotrone Trieste Strada Statale 14 km 163.5Trieste 34149Italy Department of Physics Hangzhou Normal UniversityHangzhou 310036China

Using angle-resolved photoemission spectroscopy(ARPES) and low-energy electron diffraction(LEED), together with densityfunctional theory(DFT) calculation, we report the formation of charge density wave(CDW) and its interplay with the Kondo effect and topological states in CeSbTe. The observed Fermi surface(FS) exhibits parallel segments that can be well connected by the observed CDWordering vector, indicating that the CDWorder is driven by the electron-phonon coupling(EPC) as a result of the nested FS. The CDW gap is large(~0.3 eV) and momentum-dependent, which naturally explains the robust CDWorder up to high temperatures. The gap opening leads to a reduced density of states(DOS) near the Fermi level(EF), which correspondingly suppresses the many-body Kondo effect, leading to very localized 4 f electrons at 20 K and above. The topological Dirac cone at the X point is found to remain gapless inside the CDW phase. Our results provide evidence for the competition between CDWand the Kondo effect in a Kondo lattice system. The robust CDWorder in CeSbTe and related compounds provide an opportunity to search for the long-sought-after axionic insulator.

关键词： charge density wave Kondo effect Dirac semimetal

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Past,present,and future perspectives of ultrasound-guided ablation of liver tumors:Where could artificial intelligence lead interventional oncology?

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Artificial Intelligence in Cancer 2024年第1期5卷 1-12页

作者： Paola Tombesi Andrea Cutini Valentina Grasso Francesca Di Vece Ugo Politti Eleonora Capatti Florence Labb Stefano petaccia Sergio Sartori Department of Internal Medicine Section of Interventional UltrasoundSt.Anna HospitalFerrara 44100Italy Esaote S.p.A. Genova 16100Italy

The first ablation procedures for small hepatocellular carcinomas were percutaneous ethanol injection under ultrasound(US)***,radiofrequency ablation was shown to achieve larger coagulation areas than percutaneous ethanol injection and became the most used ablation technique *** the past decade,microwave ablation systems have achieved larger ablation areas than radiofrequency ablation,suggesting that the 3-cm barrier could be broken in the treatment of liver ***,US techniques to guide percutaneous ablation have seen important ***-enhanced US(CEUS)can define and target the tumor better than US and can assess the size of the ablation area after the procedure,which allows immediate retreatment of the residual tumor ***,fusion imaging fuses real-time US images with computed tomography or magnetic resonance imaging with significant improvements in detecting and targeting lesions with low conspicuity on ***,software powered by artificial intelligence has been developed to allow three-dimensional segmentation and reconstruction of the anatomical structures,aiding in procedure planning,assessing ablation completeness,and targeting the residual viable foci with greater precision than ***,this could lead to the ablation of tumors up to 5-7 cm in size.

关键词： Artificial intelligence Fusion imaging Percutaneous thermal ablation Microwave ablation Radiofrequency ablation Ultrasound Contrast-enhanced ultrasound

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Numerical analysis of fluid flow dynamics around a yawed half-submerged cylinder inside an open channel

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Journal of Hydrodynamics 2021年第1期33卷 111-119页

作者： M.I.Alamayreh A.Fenocchi G.petaccia S.Sibilla E.Persi Alternative Energy Department Al-Zaytoonah University of JordanJordanAmman Department of Civil Engineering and Architecture University of PaviaPaviaItaly

The drag and side force coefficients of a half-submerged cylinder in a free-surface flow were calculated through numerical simulations,with the aim of supporting the numerical modelling of log transport in *** variability of these coefficients with the yaw angle with respect to the flow direction and with the ratio between the flow depth and the diameter of the cylinder were *** were performed with the three-dimensional code ANSYS/CFX,employing the volume of fluid multiphase technique to reproduce the critical interaction between the free surface and the *** numerical tests,showing the rise of the drag force coefficient for increasing yaw angles passing from flow-parallel to flow-perpendicular cylinder and the peak of the side force coefficient for flow-oblique cylinder,were validated by comparison with the results of laboratory *** simulations were then extended to conditions with significant blockage in the vertical direction which had not been previously experimented,revealing a strong increase in the force coefficients for decreasing ratios between the flow depth and the cylinder diameter.A detailed description of the reproduced flow features in the proximity of the cylinder for the different cases was furthermore *** report,in addition to the analysis of the force coefficients,could serve a much wider range than that of log transport,i.e.,any case in which a floating cylinder interacts with free-surface flow.

关键词： Large woody debris(LWD)transport floating objects drag and side force coefficients vertical blockage free-surface interaction

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Nuclear Properties of Carbon Nanotubes for Fast Neutron Detection

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Journal of Energy and Power Engineering 2018年第4期12卷 192-196页

作者： Jorge Antonio Garcia Gallardo Sebastián Beneitez Pupo Mauricio petaccia Juana Gervasoni Department of Metallic and Nanostructured Materials（MMyN） Bariloche Atomic Centre（CNEA）San Carlos de Bariloche 8400Argentin

Fast neutron detection is a subject of great relevance in modem nuclear science and engineering, in particular, with the recent advances in nuclear fusion research, detection of fast neutron became a key issue. Nuclear properties of carbon are of special interest due to its relatively high capture cross section for fast neutrons. Devices made of silicon carbide and diamond are based on these properties, and so are being developed to be used with the proper wiring. In addition, in recent years carbon nano-tubes unveiled their electrical and mechamical properties, which can be exploited for neutron detection. In this work, we use MCNP5 Monte Carlo code to analyze the carbon nuclear properties and discuss the way nano-tubes can be used for fast neutron detection.

关键词： Fast neutron nuclear fusion carbon nano-tube nano-device.

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