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Intrinsic valley-polarized quantum anomalous Hall effect in a two-dimensional germanene/MnI_(2) van der Waals heterostructure

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Chinese Physics B 2024年第7期33卷 2-7页

作者：董晓晶张昌文 school of Physics and Technology Institute of SpintronicsUniversity of JinanJinan 250022China school of Physics and Physical Engineering Qufu Normal UniversityQufu 273100China

Valley-polarized quantum anomalous Hall effect(VQAHE), combined nontrivial band topology with valleytronics,is of importance for both fundamental sciences and emerging applications. However, the experimental realization of this property is challenging. Here, by using first-principles calculations and modal analysis, we predict a mechanism of producing VQAHE in two-dimensional ferromagnetic van der Waals germanene/MnI_(2) heterostructure. This heterostructure exhibits both valley anomalous Hall effect and VQAHE due to the joint effects of magnetic exchange effect and spin–orbital coupling with the aid of anomalous Hall conductance and chiral edge state. Moreover interestingly, through the electrical modulation of ferroelectric polarization state in In_(2)Se_(3), the germanene/Mn I_(2)/In_(2)Se_(3) heterostructure can undergo reversible switching from a semiconductor to a metallic behavior. This work offers a guiding advancement for searching for VQAHE in ferromagnetic van der Waals heterostructures and exploiting energy-efficient devices based on the VQAHE.

关键词： valley-polarized quantum anomalous Hall effect ferromagnetic

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A new class of generalized quasi-variational inequalities with applications to Oseen problems under nonsmooth boundary conditions

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Science China mathematics 2024年第2期67卷 315-338页

作者： Shengda Zeng Akhtar A.Khan Stanislaw Migórski Guangxi Colleges and Universities Key Laboratory of Complex System Optimization and Big Data Processing Yulin Normal UniversityYulin 537000China Faculty of mathematics and Computer Science Jagiellonian University in Krak´owKrak´ow 30348Poland Center for Applied and Computational mathematics School of Mathematical SciencesRochester Institute of TechnologyRochesterNY 14623USA College of Sciences Beibu Gulf UniversityQinzhou 535000China

In this paper, we study a generalized quasi-variational inequality (GQVI for short) with twomultivalued operators and two bifunctions in a Banach space setting. A coupling of the Tychonov fixedpoint principle and the Katutani-Ky Fan theorem for multivalued maps is employed to prove a new existencetheorem for the GQVI. We also study a nonlinear optimal control problem driven by the GQVI and givesufficient conditions ensuring the existence of an optimal control. Finally, we illustrate the applicability of thetheoretical results in the study of a complicated Oseen problem for non-Newtonian fluids with a nonmonotone andmultivalued slip boundary condition (i.e., a generalized friction constitutive law), a generalized leak boundarycondition, a unilateral contact condition of Signorini’s type and an implicit obstacle effect, in which themultivalued slip boundary condition is described by the generalized Clarke subgradient, and the leak boundarycondition is formulated by the convex subdifferential operator for a convex superpotential.

关键词： generalized quasi-variational inequality existence theorem optimal control Kakutani-Ky Fan theorem Oseen problem non-Newtonian fluid nonmonotone slip boundary condition

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Splitting of the virtual class for genus one stable quasimaps

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Science China mathematics 2024年

作者： Sanghyeon Lee Mu-Lin Li Shanghai Center for Mathematical Sciences Fudan University school of mathematics Hunan University

We analyze the local structure of the moduli space of genus one stable quasimaps. Combining it with the p-fields theory developed by Chang and Li（2020）, we prove the splitting formula for the virtual cycle of stable...

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Model-based investigation on building thermal mass utilization and flexibility enhancement of air conditioning loads

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Building Simulation 2024年第8期17卷 1289-1308页

作者： Yue Sun Tianyi Zhao Shan Lyu institute of Building Energy School of Infrastructure EngineeringDalian University of TechnologyDalian116024China school of Civil Engineering Chongqing UniversityChongqing 400045China

Building air conditioning systems(ACs)can contribute to the stable operation of power grids by participating in peak load shaving programs,but the participants need a fast and accurate zone temperature prediction model,e.g.,the detailed room thermal-resistance(RC)model,to improve peak shaving effect and avoid obvious thermal ***,when applying the detailed room RC model to multi-zone buildings,conventional studies mostly consider the heat transfer among neighboring rooms,which contributes little to the prediction accuracy improvement,but leads to complicated model structure and heavy ***,a distributed RC model is developed for multi-zone buildings in this *** to conventional models,the proposed model considers the total heat transfer between the building and the air,and ignores the heat transfer among indoor air in neighboring rooms through internal walls with heavy thermal mass,thereby having comparable temperature prediction accuracy,simpler structure,and stronger *** on the model,the effectiveness of passive pre-cooling strategies in reducing the air conditioning loads during peak periods is *** indicate that the thermal insulation performance of opaque building envelope is quite important to the flexibility enhancement of air conditioning *** an uninsulated building envelope,passive pre-cooling is useless for the peak load *** comparison,well insulated opaque building envelope enables the building thermal mass to be utilized through passive pre-cooling,which leads to the air conditioning loads during peak periods being further reduced by about 12%.

关键词： RC model passive pre-cooling internal thermal mass building energy flexibility

Modulating the alloying mode in the doping-induced synthesis of Au-Pd nanowires

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Nano Research 2024年第4期17卷 3334-3343页

作者： Hui Jin Xiaoliang Wei Lecheng Zhao Jialong Yu Qiao Pan Shumin Li Qian Wang Zhaotong Yuan Dan Yang Donghui Zhao Hongyu Chen Yawen Wang institute of Advanced Synthesis School of Chemistry and Molecular EngineeringJiangsu National Synergistic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China school of Science Westlake UniversityHangzhou 310064China institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310064China

Heterogeneous doping is one effective strategy for synthesizing metal alloy ***,the heterogeneous doping processes of Pd on the ultrathin Au nanowires were systematically modulated and ***-Pd alloy nanowires with various morphologies and lattice structures can be obtained by adjusting the morphology of the precursor Au nanowires and the kinetics of the heterogeneous doping *** effects of the rate of Pd reduction and the concentration of the ligand oleylamine(OAm)on the Pd deposition and alloying mode were ***,as the Pd deposition rate decreases,the Pd deposition and alloying mode switches from the island-forming Stransky–Krastanov(SK)mode to the epitaxial Frank-van der Merwe(FM)mode,and eventually to an unconventional twisting alloying mode,where the interdiffusion of Pd and Au causes drastic rearrangement of the lattice structure and formation of helical *** kinetics-related variation of alloying mode could also be observed in the Au-Ag nanowires,demonstrating a general design principle for the synthesis of alloy *** addition,the electrocatalytic performance of various Au-Pd nanowires was evaluated,and the alloy nanowire formed via the SK mode was found to be an excellent electrocatalyst for oxygen reduction and ethanol oxidation.

关键词： gold nanowires Au-Pd alloy oleylamine post-synthetic modification

Dynamic analysis of tethered defunct satellites with solar panels

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Astrodynamics 2024年第2期8卷 297-309页

作者： Rui Qi Yang Zhang Heng Jiang Rui Zhong school of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China school of Aerospace Astronautics Beihang UniversityBeijing 100191China

A precise dynamic model for towing and removing a defunct satellite with solar panels in orbit using a tethered net often has low computational efficiency owing to the complex contact and collision between the net and panels,which is not conducive to *** solve this problem,a“single main tether–multiple subtether”bifurcation structure with beads was employed as the tethered net *** study investigated the dynamics of tethered defunct satellites with solar panels,particularly the behavior of the attitude of the tethered satellite,oscillation of the main tether,and vibration of solar panels under different *** results showed that different attachment configurations of the subtethers and the flexibility of the main tether have an evident impact on the dynamic characteristics of the system.

关键词： space debris flexible solar panels tethered towing Kane’s method dynamics modeling

A comparative assessment of gravitational field modeling methods for binary asteroid landing

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Astrodynamics 2024年第3期8卷 417-435页

作者： Tongge Wen Xiangyuan Zeng Ziwen Li Yang Yu school of Automation Beijing Institute of TechnologyBeijing100081China school of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

The tradeoff between accuracy and efficiency in gravitational field modeling for binary asteroid landing is one of the challenges in dynamical *** representative gravitational modeling methods are employed and compared in this *** are the sphere-sphere model,ellipsoid-sphere model,inertia integral-polyhedron method,and finite element *** study considers the differences between these four models,particularly their effects on the landing dynamics of a lander.A framework to simulate the coupled orbit-attitude motion of a lander in a binary system is first *** simulations are then performed on the natural landings on the second primary of the(66391)Moshup-Squannit *** results show significant differences in the final landing dispersions,settling time,and sliding distance when applying the simplified *** the basis of the modeling accuracy and computational efficiency,the finite element method should be chosen for future missions.

关键词： landing dynamics contact dynamics gravitational field modeling binary asteroid

Slow magnetic relaxation behaviors and diamagnetic dilution studies of a carboxyl bridged dinuclear dysprosium(Ⅲ) complex

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Journal of Rare Earths 2024年第11期42卷 2088-2096页

作者： Wenting Liu Yibo Qiu Weiqin Xu Manli Cao Xin Deng Weiquan Lin school of Chemistry and Materials Science Guangdong University of Education school of Chemistry and Chemical Engineering/institute of Clean Energy and Materials Guangzhou University

By using a rigid bulky carboxylic ligand a-cyanocinnamic acid（CCA）,a dinuclear dysprosium（Ⅲ） complex [Dy2（CCA）6（MeOH）4]（1） was *** crystal X-ray crystallography reveals that the two eight-coordinate dysprosium ions are bridged by four deprotonated carboxyl groups,forming a centrosymmetric paddle-wheel-1ike *** magnetic property measurements indicate that complex 1 displays field-induced slow magnetic *** temperature-dependent relaxation times can be fitted using Orbach and Raman processes with parameters of n=2.8（2）,C=27（8） s-1/K~n,τ0=5（2） × 10-10s and Ueff=40（3） *** studies on the diamagnetic YⅢ-diluted analogue[Dy0.206Y1.794（CCA）6（MeOH）4]（2） reveal its slow magnetic relaxation behavior without external dc field and the antiferromagnetic coupling between the DyⅢions in *** on the obtained relaxation times of 2lead to the parameters of n=4.5（3）,C=0.7（2） s-1/K~n,τ0=2.8（2） × 10-9s and Ueff=38（2） *** results suggest that slow magnetic relaxation originates from the single-ion relaxation of DyⅢ***,the diamagnetic dilution can suppress other fast relaxation pathways at low temperature,on account of the elimination of magnetic coupling and dipolar *** initio calculations were then performed on the single DyⅢion species {YDy} and indicate that the first excited Kramers doublets（KDs）lie at ca.76 cm-1,which is slightly higher than the experimental *** intramolecular magnetic interactions were also calculated and indicate a weak ferromagnetic dipole-diploe magnetic interaction and an antiferromagnetic exchange coupling.

关键词： Diamagnetic dilution Dilanthanide complexes Rare earths Single-molecule magnets

Planar Hall Effect in the Charge-Density-Wave Bi2Rh3Se2

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Chinese Physics Letters 2024年第7期41卷 131-136页

作者：蔡明桔陈正杨扬朱相德孙浩翔朱安康刘学韩玉岩高文帅田明亮 institutes of Physical Science and Information Technology Anhui University Anhui Key Laboratory of Low-energy Quantum Materials and Devices High Magnetic Field LaboratoryHefei Institutes of Physical Science Chinese Academy of Sciences Stony Brook institute at Anhui University Anhui University school of mathematics and Physics Bengbu University school of Physics and Optoelectronics Engineering Anhui University

We systematically investigate in-plane transport properties of ternary chalcogenide *** rotating the magnetic field within the plane of the sample,one can distinctly detect the presence of both planar Hall resistance and anisotropic longitudinal resistance,and the phenomena appeared are precisely described by the theoretical formulation of the planar Hall effect （PHE）.In addition,anisotropic orbital magnetoresistance rather than topologically nontrivial chiral anomalies dominates the PHE in *** finding not only provides another platform for understanding the mechanism of PHE,but could also be beneficial for future planar Hall sensors based on two-dimensional materials.

关键词： Anisotropy