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Modulation of the octahedral structure and potential superconductivity of La3Ni2O7 through strain engineering

Science China(physics,Mechanics & Astronomy) 2025年

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-sen University MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of condensed matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University Institute of High Pressure physics School of Physical Science and Technology Ningbo University

The recent transport measurements of La3Ni2O7uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature （P-T） phase *** by this,we perform theoretical first-principles studies of La3Ni2O7with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d2zelectron density at the Fermi energy (nE Fz) that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of nE Fz,we propose that superconductivity can be achieved by applying only～2 GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nE Fzand the superconducting Tcin *** study provides new routes to the search of high-Tcsuperconductors in future experiments.

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A Reproducible Approach of Preparing High-Quality Overdoped Bi_2Sr_2CaCu_2O_(8+δ) Single Crystals by Oxygen Annealing and Quenching Method

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Chinese physics Letters 2016年第6期33卷 132-136页

作者：张玉晓赵林顾根大周兴江 National Lab for Superconductivity Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of Sciences condensed matter physics and materials Science Department Brookhaven National Laboratory Collaborative Innovation center of quantum matter

We report a reproducible approach in preparing high-quality overdoped Bi2 Sr2 CaCu2 08＋δ （Bi2212） single crystals by annealing Bi2212 crystals in high oxygen pressure followed by a fast quenching. In this way, high-quality overdoped and heavily overdoped Bi2212 single crystals are obtained by controlling the annealing oxygen pressure. We find that, beyond a limit of oxygen pressure that can achieve most heavily overdoped Bi2212 with a Tc N63 K, the annealed Bi2212 begins to decompose. This accounts for the existence of the hole-doping limit and thus the Tc limit in the heavily overdoped region of Bi2212 by the oxygen annealing process. These results provide a reliable way in preparing high-quality overdoped and heavily overdoped Bi2212 crystals that are important for studies of the physical properties, electronic structure and superconductivity mechanism of the cuprate superconductors.

关键词： Bi is it of A Reproducible Approach of Preparing High-Quality Overdoped Bi2Sr2CaCu2O Single Crystals by Oxygen Annealing and Quenching Method in high that by Sr

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Modulating magnetism of nitrogen-doped zigzag graphene nanoribbons

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Chinese physics B 2014年第6期23卷 507-513页

作者：赵尚骞吕燕吕文刚梁文杰王恩哥 Institute of physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics International center for quantum materials School of Physics Peking University

We present a study of electronic properties of zigzag graphene nanoribbons （ZGNRs） substitutionally doped with nitrogen atoms at a single edge by first principle calculations. We find that the two edge states near the Fermi level sepa- rate due to the asymmetric nitrogen-doping. The ground states of these systems become ferromagnetic because the local magnetic moments along the undoped edges remain and those along the doped edges are suppressed. By controlling the charge-doping level, the magnetic moments of the whole ribbons are modulated. Proper charge doping leads to interest- ing half-metallic and single-edge conducting ribbons which would be helpful for designing graphene-nanoribbon-based spintronic devices in the future.

关键词： graphene nanoribbons charge doping spin-polarization spatial localization

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A-site ordered quadruple perovskite oxides AA'3B4O12

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Chinese physics B 2016年第7期25卷 62-74页

作者：龙有文 Beijing National Laboratory for condensed matter physics Institute of Physics Chinese Academy of Sciences Collaborative Innovation center of quantum matter

The A-site ordered perovskite oxides with chemical formula AA’BOdisplay many intriguing physical properties due to the introduction of transition metals at both A and B sites. Here, research on the recently discovered intermetallic charge transfer occurring between A-site Cu and B-site Fe ions in La CuFeOand its analogues is reviewed, along with work on the magnetoelectric multiferroicity observed in La MnCrOwith cubic perovskite structure. The Cu–Fe intermetallic charge transfer(LaCuFeO→ LaCuFeO) leads to a first-order isostructural phase transition accompanied by drastic variations in magnetism and electrical transport properties. The La MnCrOis a novel spindriven multiferroic system with strong magnetoelectric coupling effects. The compound is the first example of cubic perovskite multiferroics to be found. It opens up a new arena for studying unexpected multiferroic mechanisms.

关键词： high-pressure synthesis A-site ordered perovskite charge transfer multiferroicity

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A review of the growth and structures of silicene on Ag(111)

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Chinese physics B 2015年第8期24卷 15-24页

作者：吴克辉 Beijing National Laboratory for condensed matter physics and Institute of physics Chinese Academy of Sciences Collaborative Innovation center of quantum matter

Ag(111) is currently the most often used substrate for growing silicene films. Silicene forms a variety of different phases on the Ag(111) substrate. However, the structures of these phases are still not fully understood so far. In this brief review we summarize the growth condition and resulting silicene phases on Ag(111), and discuss the most plausible structural model and electronic property of individual phases. The existing debates on silicene on Ag(111) system are clarified as mush as possible.

关键词： silicene scanning tunneling microscopy surface structure Dirac fermion

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Direct evidence of high temperature superconductivity in one-unit-cell FeSe films on SrTiO_3 substrate by transport and magnetization measurements

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Chinese physics B 2015年第11期24卷 15-22页

作者：邢颖王健 International center for quantum materials School of Physics Peking University Collaborative Innovation center of quantum matter

Zero resistance and Meissner effect are two crucial experimental evidences of superconductivity in determining a new kind of superconductor, which can be detected by transport and diamagnetic measurements. In this paper, we briefly review the main transport and magnetization results on the one unit cell （1-UC） FeSe films grown on SrTiO3 （STO） substrates from our team in recent years, which identify the high temperature superconductivity in 1-UC FeSe films.

关键词： two-dimensional superconductivity one-unit-cell FeSe transport measurement diamagnetic prop-erty

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Delayed response to the photovoltaic performance in a double quantum dots photocell with spatially correlated fluctuation

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Chinese physics B 2023年第5期32卷 610-618页

作者：祝胜男赵顺才许路昕陈林杰 Department of physics Faculty of ScienceKunming University of Science and TechnologyKunming 650500China center for quantum materials and computational condensed matter physics Faculty of ScienceKunming University of Science and TechnologyKunming 650500China

A viable strategy for enhancing photovoltaic performance is to comprehend the underlying quantum physical regime of charge transfer in a double quantum dots(DQD) photocell. This work explored the photovoltaic performance dependent spatially correlated fluctuation in a DQD photocell. The effects of spatially correlated fluctuation on charge transfer and output photovoltaic efficiency were explored in a proposed DQD photocell model. The results revealed that the charge transport process and the time to peak photovoltaic efficiency were both significantly delayed by the spatially correlated fluctuation, while the anti-spatially correlated fluctuation reduced the output peak photovoltaic efficiency. Further results revealed that the delayed response could be suppressed by gap difference and tunneling coefficient within two dots. Subsequent investigation demonstrated that the delayed response was caused by the spatial correlation fluctuation slowing the generative process of noise-induced coherence, which had previously been proven to improve the quantum photovoltaic performance in quantum photocells. And the reduced photovoltaic properties were verified by the damaged noise-induced coherence owing to the anti-spatial correlation fluctuation and a hotter thermal ambient environment. The discovery of delayed response generated by the spatially correlated fluctuations will deepen the understanding of quantum features of electron transfer, as well as promises to take our understanding even further concerning quantum techniques for high efficiency DQD solar cells.

关键词： delayed response spatially correlated fluctuation double quantum dots photocell

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Preparation and Photocatalytic Activity of ZnO/Fe_(2)O_(3)Nanorod Arrays and ZnO/NiO Nanotube Arrays

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Chinese physics Letters 2012年第3期29卷 187-189页

作者： CUI Yin-Fang WANG Cong WU Su-Juan LIU Yu WANG Tian-Min center for condensed matter and materials physics Department of PhysicsBeihang UniversityBeijing 100191

ZnO/Fe_(2)O_(3) nanorod arrays(NRs)and ZnO/NiO nanotube arrays(NTs)are synthesized on Si substrates by using a facile two-step growth *** absorption spectrum of the ZnO/Fe_(2)O_(3) NRs shows significant absorption in the visible light *** photocatalytic properties are evaluated by the degradation of methylene blue(MB).It is found that the ZnO/Fe_(2)O_(3) NRs display higher photocatalytic activity than the ZnO/NiO nanotube arrays under UV-vis light *** is most likely attributed to an effective separation of photoelectrons and holes.

关键词： ZnO/NiO absorption

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The Influence of Au-Doping on Morphology and Visible-Light Reflectivity of TiN Thin Films Deposited by Direct-Current Reactive Magnetron Sputtering

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Chinese physics Letters 2010年第5期27卷 185-188页

作者：纳元元王聪刘宇 center for condensed matter and materials physics Department of Physics Beihang University Beijing 100191

Ti, TiN and Au-TiN （Au content： from 0.5%to 7.7%） thin films were deposited on stainless steel substrates by dc reactive magnetron sputtering with a metal Ti target. The crystal structure, surface morphology and visiblelight reflectivity of the films for different film compositions are studied in detail. Distinctly different surface morphologies appear for the Ti, TiN and Au-TiN thin films. It can be observed that the surface morphology of the TiN film is affected by the Au-doping, when the Au content increases from 0% to 7.7%, surface roughness enlarges from 62.4 to 82.8 nm. Moreover, visible-light reflectivity varies significantly with increasing A u contents in the TiN films. However, the rettectivity of the TiN thin film at 550-800 nm is higher than that of the Au-TiN thin film. The present work illustrates the dependence of metal elements on the surface morphology and on the reflectivity of Au-TiN thin films. It is speculated that the addition of Au can suppress the formation and growth of TiN grains so that it changes the surface morphology and the Au-TiN thin film has potential applications in spectral selective coating.

关键词： Au TiN Au content thin film

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Density Functional Theory of Composite Fermions

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Chinese physics Letters 2015年第3期32卷 105-108页

作者：张银寒施均仁 Beijing National Laboratory for condensed matter physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 International center for quantum materials Peking University Beijing 100871 Collaborative Innovation center of quantum matter Beijing 100871

We construct a density functional theory for two-dimensional electron （hole） gases subjected to both strong magnetic fields and external potentials. In particular, we are focused on regimes near even-denominator filling factors, in which the systems form composite fermion liquids. Our theory provides a systematic and rigorous approach to determine the properties of ground states in a fractional quantum Hall regime that is modified by artificial structures. We also propose a practical way to construct an approximated functional.

关键词： Density Functional Theory of Composite Fermions

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