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A two-dimensional tetragonal structure of vanadium telluride

Nano Research 2023年第5期16卷 7749-7755页

作者： Zizhao Liu Ye Tao Zhiqiang Cui Yi Ji Xuhan Zhou Peigen Li Yunwei Zhang Dingyong Zhong School of Physics Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

The family of vanadium chalcogenides with variable stoichiometry and abundant crystallographic structures are promising platforms for realizing exotic emergent phenomena.Here,we report on a novel two-dimensional(2D)tetragonal structure of vanadium telluride(VTe)grown by molecular beam epitaxy.The atomic structures and electronic properties are revealed by scanning tunneling microscopy and first-principles calculations.Different from the hexagonal or trigonal lattices of 2D VTe_(2),the 2D VTe with a V:Te ratio of 1:1 exhibits an uncommon square lattice.Non-zero differential conductivity at the Fermi energy detected by scanning tunneling spectroscopy reveals the metallic feature of VTe.Meanwhile,Friedel oscillations are observed near chiral point defects and domain walls,illustrating the itinerant nature of the electrons close to the Fermi energy.Our firstprinciples structure searches identify a 2D body-centered cubic(bcc)-like structure with a favorable formation energy to be the candidate of the metallic phase of the tetragonal VTe obtained experimentally.Based on our calculations the 2D bcc-like structure possesses a strong 2D antiferromagnetic order.Our work enriches the family of vanadium chalcogenides and provides a possible 2D antiferromagnetic material for fabricating advanced spintronic devices.

关键词： vanadium telluride molecular beam epitaxy scanning tunneling microscopy two-dimensional magnetism first-principles calculation

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Magnetic two-dimensional chromium trihalides:structure,properties and modulation

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Rare Metals 2022年第9期41卷 2921-2942页

作者： Biao Zhang Yi Zeng Zi-Jing Zhao Da-Ping Qiu Teng Zhang Yang-Long Hou Beijing Innovation Centre for Engineering Science and Advanced Technology Beijing Key Laboratory for Magnetoelectric Materials and DevicesSchool of Materials Science and EngineeringPeking UniversityBeijing100871China

The unique optical and electrical properties of two-dimensional(2D)materials provide a platform for novel van der Waals(vdW)heterojunction devices but the investigation of 2D magnetism is still limited.Recently,the emergence of long-range magnetic order atomically thin crystals expands 2D family,providing possibilities for the study of low-dimensional spin behavior and novel spintronics devices.As a specific member of magnetic van der Waals family,chromium trihalides(CrX_(3),X=Cl,Br,I)stimulated intensive interests on account of the newfangled magnetic properties.In this review,we briefly introduce the crystal structures,magnetism of the bulk and synthetic methods of 2D CrX_(3).Subsequently,the physical properties in atomically thin limit and magnetism manipulated by external field are presented.Next,some novel physical phenomena in CrX_(3) heterojunctions are discussed.Finally,the challenges and future directions are proposed.We focus on the intriguing physical phenomena in 2D magnetic CrX_(3) by combining related theoretical calculations and experimental results,providing a perspective on these emerging materials.

关键词： two-dimensional materials Chromium trihalides two-dimensional magnetism Heterojunction

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Gate-controlled magnetic transitions in Fe_(3)GeTe_(2)with lithium ion conducting glass substrate

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Chinese Physics B 2021年第9期30卷 72-76页

作者：陈光毅张玉齐少勉陈剑豪 International Center of Quantum Material School of PhysicsPeking UniversityBeijing 100871China Beijing Academy of Quantum Information Sciences Beijing 100193China Key Laboratory for the Physics and Chemistry of Nanodevices Peking UniversityBeijing 100871China Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials Peking UniversityBeijing 100871China

Since the discovery of magnetism in two dimensions,effective manipulation of magnetism in van der Waals magnets has always been a crucial goal.Ionic gating is a promising method for such manipulation,yet devices gated with conventional ionic liquid may have some restrictions in applications due to the liquid nature of the gate dielectric.Lithium-ion conducting glass-ceramics(LICGC),a solid Li^(+)electrolyte,could be used as a substrate while simultaneously acts as a promising substitute for ionic liquid.Here we demonstrate that the ferromagnetism of Fe_(3)GeTe_(2)2(FGT)could be modulated via LICGC.By applying a voltage between FGT and the back side of LICGC substrate,Li^(+)doping occurs and causes the decrease of the coercive field(Hc)and ferromagnetic transition temperature(Tc)in FGT nanoflakes.A modulation efficiency for H_(c)of up to~24.6%under V_(g)=3.5 V at T=100 K is achieved.Our results provide another method to construct electrically-controlled magnetoelectronics,with potential applications in future information technology.

关键词： two-dimensional magnetism two-dimensional material ionic gating

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Molecular beam epitaxy growth of iodide thin films

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Chinese Physics B 2021年第2期30卷 150-153页

作者：蔡新强徐智临季帅华李娜陈曦 State Key Laboratory of Low dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China

Study of two-dimensional(2D)magnetic materials is important for both fundamental research and application.Here we report molecular beam epitaxy growth of iodides,candidates for exhibiting 2D magnetism.Decomposition of CrI_(3)is utilized to produce stable gaseous I_(2)flux.Growth of MnI_(2),GdI_(3),and CrI_(2)down to monolayer is successful achieved by co-depositing I2 and corresponding metal atoms.The thin films of the three materials are characterized by scanning tunneling microscope and found to be insulators with bandgaps of 4.4 e V,0.6 e V,and 3.0 e V,respectively.The film growth paves the way for further study of magnetic properties at the 2 D limit.

关键词： two-dimensional magnetism iodide thin films molecular beam epitaxy scanning tunneling microscope

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