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Proposal for valleytronic materials:Ferrovalley metal and valley gapless semiconductor

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Frontiers of physics 2024年第2期19卷 131-139页

作者： San-Dong Guo Yu-Ling Tao Guangzhao Wang Shaobo Chen Dong Huang yee sin Ang School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing School of Electronic Information EngineeringYangtze Normal UniversityChongqing 408100China College of Electronic and Information Engineering Anshun UniversityAnshun 561000China Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)8 Somapah RoadSingapore 487372Singapore

Valleytronic materials can provide new degrees of freedom to future electronic *** this work,the concepts of the ferrovalley metal(FVM)and valley gapless semiconductor(VGS)are proposed,which can be achieved in valleytronic bilayer systems by electric field *** valleytronic bilayer systems,the interaction between out-of-plane ferroelectricity and A-type antiferromagnetism can induce layer-polarized anomalous valley Hall(LP-AVH)*** K and−K valleys of FVM are both metallic,and electron and hole carriers simultaneously *** the extreme case,the FVM can become VGS by analogizing spin gapless semiconductor(SGS).Moreover,it is proposed that the valley splitting enhancement and valley polarization reversal can be achieved by electric field engineering in valleytronic bilayer *** the bilayer RuBr_(2)as an example,our proposal is confirmed by the first-principle *** FVM and VGS can be achieved in bilayer RuBr_(2)by applying electric *** appropriate electric field range,increasing electric field can enhance valley splitting,and the valley polarization can be reversed by flipping electric field *** effectively tune valley properties by electric field in bilayer systems,the parent monolayer should possess out-of-plane magnetization,and have large valley *** results shed light on the possible role of electric field in tuning valleytronic bilayer systems,and provide a way to design the ferrovalley-related material by electric field.

关键词： valleytronics electric field bilayer

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经典电路网络中奇异束缚态的实验观察

Science Bulletin 2024年第14期69卷 2194-2204页

作者：邹德源陈天孟海瑜 yee sin Ang 张向东李庆华 Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Department of Physics National University of SingaporeSingapore 117542Singapore Science Mathematics and Technology ClusterSingapore University of Technology and DesignSingapore 487372Singapore Joint School of National University of singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

Exceptional bound(EB)states represent a unique new class of robust bound states protected by the defectiveness of non-Hermitian exceptional *** distinct from the more well-known topological states and non-Hermitian skin states,they were recently discovered as a novel source of negative entanglement entropy in the quantum entanglement ***,EB states have been physically elusive,being originally interpreted as negative probability eigenstates of the propagator of nonHermitian Fermi *** this work,we show that EB states are in fact far more ubiquitous,also arising robustly in broad classes of systems whether classical or *** hinges crucially on a newlydiscovered spectral flow that rigorously justifies the EB nature of small candidate lattice *** a highlight,we present their first experimental realization through an electrical circuit,where they manifest as prominent stable resonant voltage *** work brings a hitherto elusive but fundamentally distinctive quantum phenomenon into the realm of classical metamaterials,and provides a novel pathway for the engineering of robust modes in otherwise sensitive systems..

关键词： Exceptional bound states Classical circuit network Non-Hermitian Robustness Exceptional point

Symmetry-driven half-integer conductance quantization in Cobalt–fulvalene sandwich nanowire

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npj Computational Materials 2023年第1期9卷 314-321页

作者： Zhuoling Jiang Kah-Meng Yam yee sin Ang Na Guo Yongjie Zhang Hao Wang Chun Zhang Department of Physics and Centre for Advanced 2D Materials National University of SingaporeSingapore 117551Singapore Science Mathematics and Technology(SMT)ClusterSingapore University of Technology and DesignSingapore 487372Singapore Department of Chemistry National University of SingaporeSingapore 117543Singapore National University of singapore Chongqing Research Institute 401123 ChongqingChina

Precise manipulation and monitoring spin transport in one-dimensional (1D) systems is a long-sought goal in the field of nano-spintronics. Based on first-principles calculations, we report the observation of half-integer conductance quantization in the Cobalt-fulvalene sandwich nanowire. Compared with a pure monatomic Cobalt wire, the introduction of fulvalene molecules leads to threeimportant features: Firstly, the strong coupling between the fulvalene and the Cobalt prevents the contamination of the ambientair, ensuring both chemical and physical stabilities;Secondly, the fulvalene symmetry-selectively filters out most of the d-typeorbitals of the Cobalt while leaving a single d-type orbital to form an open spin channel around the Fermi level, which offers amechanism to achieve the observed half-integer conductance;Thirdly, it maintains a superexchange coupling between adjacent Coatoms to achieve a high Curie temperature. Spin transport calculations show that this half-metallic nanowire can serve as a perfectspin filter or a spin valve device, thus revealing the potential of Cobalt-fulvalene sandwich nanowire as a promising building blockof high-performance spintronics technology.

关键词： sandwich coupling transport

Novel role of STAT3 in microglia-dependent neuroinflammation after experimental subarachnoid haemorrhage

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Stroke & Vascular Neurology 2022年第1期7卷 62-70页

作者： Zhiyuan Vera Zheng Junfan Chen Hao Lyu sin Yu Erica Lam Gang Lu Wai yee Chan George K C Wong Department of Surgery The Chinese University of Hong KongShatinHong Kong Department of Surgery Hainan General HospitalHaikouHainanChina School of Biomedical Science The Chinese University of Hong KongShatinHong Kong

Background and purpose Signal transducer and activator of transcription 3(STAT3)may contribute to the proinflammation in the central nervous system diseases by modulating the microglial ***,this study was intended to investigate the effect of STAT3 on microglia-dependent neuroinflammation and functional outcome after experimental subarachnoid haemorrhage(SAH).Methods The SAH model was established by endovascular perforation in the ***-time PCR(RtPCR)and western blot were used to examine the dynamic STAT3 signalling pathway responses after *** clarify the role of the STAT3 signalling pathway in the microglia-dependent neuroinflammation after SAH,the microglia-specific STAT3 knockout(KO)mice were generated by the Cre-LoxP *** neurological functions were assessed by Catwalk and Morris water maze *** loss after SAH was determined by immunohistochemistry *** polarisation status after STAT3 KO was then examined by RtPCR and *** The STAT3 and Janus kinase-signal transducer 2 activated immediately with the upregulation and phosphorylation after *** factors and related mediators altered dynamically and *** STAT3 deletion ameliorated the neurological impairment and alleviated the early neuronal loss after *** investigate the underlying mechanism,we examined the microglial reaction after STAT3 ***3 deletion reversed the increase of microglia after *** of STAT3 triggered the early morphological changes of microglia and primed microglia from M1 to M2 ***,microglial STAT3 deletion suppressed the SAH-induced proinflammation and promoted the anti-inflammation in the early *** STAT3 is closely related to the microglial polarisation transition and modulation of microglia-dependent *** STAT3 deletion improved neurological function and neuronal survival probably through promoting M2 polarisation and anti-inf

关键词： STAT3 inflammation reversed

Rational design of platinum(Ⅱ)complexes with orthogonally oriented triazolyl ligand with emission enhancement characteristics for cancer chemotherapy in vivo

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Science China Chemistry 2023年第10期66卷 2878-2884页

作者： Yeye Ai Zherui Zhang Yuexuan Fei Ruirong Ye Angela sin-yee Law Zong-Wan Mao Junqiu Liu Yongguang Li Vivian Wing-Wah Yam Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121China Institute of Molecular Functional Materials State Key Laboratory of Synthetic Chemistry and Department of ChemistryThe University of Hong KongHong KongChina School of Chemistry Sun Yat-Sen UniversityGuangzhou 510275China State Key Laboratory of Supramolecular Structure and Materials Jilin UniversityChangchun 130012China

The mitochondria are essential for tumorigenesis and have been regarded as important targets in cancer ***,the mitochondria-targeted platinum(Ⅱ)complexes have been *** introduction of the triazole group with larger steric hindrance through post-click reaction converts the hybridization of carbon from sp to sp^(2),endowing the complexes with an orthogonally oriented ligand with restricted rotation and emission enhancement *** of the triazolyl ligand has led to platinum(Ⅱ)complexes that can efficiently enter cancer cells and selectively accumulate in mitochondria,leading to significant enhancement in *** vivo anti-cancer investigations have demonstrated their distinct antitumor efficacy in substantial inhibition of tumor growth in breast cancer mice through dissipation of mitochondrial membrane potential,inducing apoptosis of tumor cell with negligibly systemic cytotoxicity.

关键词： platinum(Ⅱ)complexes post-click reaction emission enhancement mitochondria-targeting antitumor

Effect of pH on the photocatalytic removal of silver ions byβ-MnO2 particles

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 325-334页

作者： sin-Ling Chiam Anh Thi Le Swee-Yong Pung Fei-yee Yeoh School of Materials and Mineral Resources Engineering Engineering CampusUniversiti Sains Malaysia14300 Nibong TebalPulau PinangMalaysia

The presence of silver ions(Ag(I))in wastewater has a detrimental effect on living *** of soluble silver,especially at low concentrations,is *** paper presents the use ofβ-MnO2 particles as a photocatalyst to remove Ag(I)ions selectively from aqueous solution at various pH *** coupled plasma mass spectrometry(ICP-MS),X-ray diffraction(XRD),field emission electron microscope(FESEM),transmission electron microscopy(TEM),and X-ray photoelectron microscopy(XPS)were employed to determine the removal efficiency and to characterize the deposition of silver onto the surface ofβ-MnO2 *** optimum pH for the removal of Ag(I)ions was at pH 4 with 99%removal efficiency under 1 h of visible light *** phenomenon can be attributed to the electrostatic attraction betweenβ-MnO2 particles and Ag(I)ions as well as the suppression of electron–hole recombination in the presence of H+ions.

关键词： manganese oxide(MnO2) silver metal ion removal photocatalyst

Physics of electron emission and injection in two-dimensional materials: Theory and simulation

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InfoMat 2021年第5期3卷 502-535页

作者： yee sin Ang Liemao Cao Lay Kee Ang Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)SingaporeSingapore College of Physics and Electronic Engineering Hengyang Normal UniversityHengyangChina

Electrically contacting two-dimensional(2D)materials is an inevitable process in the fabrication of devices for both the study of fundamental nanoscale charge transport physics and the design of high-performance novel electronic and optoelectronic *** physics of electrical contact formation and interfacial charge injection critically underlies the performance,energyefficiency and the functionality of 2D-material-based devices,thus representing one of the key factors in determining whether 2D materials can be successfully implemented as a new material basis for the development of nextgeneration beyond-silicon solid-state device *** this review,the recent developments in the theory and the computational simulation of electron emission,interfacial charge injection and electrical contact formation in 2D material interfaces,heterostructures,and devices are *** on thermionic charge injection phenomena which are omnipresent in 2Dmaterials-based metal/semiconductor Schottky contacts,we summarize various transport models and scaling laws recently developed for 2D *** progress on the first-principle density functional theory simulation of 2D-material-based electrical contacts are also *** review aims to provide a crystalized summary on the physics of charge injection in the 2D Flatlands for bridging the theoretical and the experimental research communities of 2D material device physics and technology.

关键词： 2D material interfaces charge injection contact engineering heterostructures theory and simulations

Pancreatic lymphangioma:two case reports from an institutional experience with a rare entity and review of literature

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Journal of Pancreatology 2022年第2期5卷 98-109页

作者： Alfonso Tan-Garcia Ser yee Lee Jen San Wong Thomas W.T.Ho Keng sin Ng Kiat Hon Tony Lim Division of Pathology Department of Anatomical PathologySingapore General HospitalSingapore Surgical Associates Mount Elizabeth Medical CentreSingapore Department of Hepatopancreatobiliary and Transplant Surgery Singapore General HospitalSingapore Hepatobiliary and Pancreatic Surgery Centre Mount Elizabeth Medical CentreSingapore Digestive Surgical Oncology Department of Diagnostic Imaging Mount Alvernia HospitalSingapore

Pancreatic lymphangiomas are very rare benign cystic lesions that pose a diagnostic dilemma due to their resemblance to other non-neoplastic and neoplastic pancreatic cystic *** such,pancreatic lymphangiomas are frequently diagnosed only after histological examination of the excised *** present 2 cases of pancreatic lymphangioma,determine its prevalence at our institution and perform a detailed review of published literature since *** 1 is a 36-year-old male and case 2 is a 35-year-old female,both of which presented with abdominal *** were the only cases of pancreatic lymphangiomas reported at our institution since *** reviewed 69 cases of pancreatic lymphangiomas from 52 *** affects predominantly females with a median age of 43 and such patients typically present with abdominal pain(58.8%)or are asymptomatic(27.9%).The median size is 8.6 cm,the most common location is the head of pancreas and the most common imaging finding is that of a multilocular *** of patients underwent surgical resection(69.6%).Endoscopic ultrasound-guided fine-needle aspiration features of pancreatic lymphangiomas include chylous cyst fluid,elevated fluid triglyceride levels(15/16 cases)and numerous lymphocytes on *** majority of patients with elevated fluid triglyceride levels(13/15 cases)were managed *** lymphangiomas are rare pancreatic cystic lesions that may be diagnosed preoperatively using a multidisciplinary and multimodal approach involving clinical,radiological,biochemical and cytological features,allowing greater confidence in the selection of patients who can be managed conservatively.

关键词： Case report Cystic Diagnostic features Literature review Lymphangioma management Pancreas Prevalence

Nonlinear optical response of graphene in terahertz and near-infrared frequency regime

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Frontiers of Optoelectronics 2015年第1期8卷 3-26页

作者： yee sin ANG Qinjun CHEN Chao ZHANG School of Physics University of Wollongong New South Wales 2522 Australia Institute of Superconducting and Electronic Materials University of Wollongong New South Wales 2522 Australia

In this review, we discuss our recent theoretical work on the nonlinear optical response of graphene and its sister structure in terahertz （THz） and near-infrared frequency regime. Due to Dirac-like linear energymomentum dispersion, the third-order nonlinear current in graphene is much stronger than that in conventional semiconductors. The nonlinear current grows rapidly with increasing temperature and decreasing frequency. The third-order nonlinear current can be as strong as the linear current under moderate electric field strength of 104 V/cm. In bilayer graphene （BLG） with low energy trigonal warping effect, not only the optical response is strongly nonlinear, the optical nonlinearity is well-preserved at elevated temperature. In the presence ofa bandgap （such as semihydrogenated graphene （SHG））, there exists two well separated linear response and nonlinear response peaks. This suggests that SHG can have a unique potential as a two-color nonlinear material in the THz frequency regime where the relative intensity of the two colors can be tuned with the electric field. In a graphene superlattice structure of Kronig-Penney type periodic potential, the Dirac cone is elliptically deformed. We found that not only the optical nonlinearity is preserved in such a system, the total optical response is further enhanced by a factor proportional to the band anisotropy. This suggests that graphene superlattice is another potential candidate in THz device application.

关键词： graphene terahertz (THz) response nonlinear effect photomixing