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Superconductivity at 3. K in gadolinium-arsenide oxides GdO_(1-x)F_xFeAs

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Science china(Physics,Mechanics & Astronomy) 2008年第6期51卷 719-722页

作者： CHENG Peng, FANG Lei, YANG Huan, ZHU XiYu, MU Gang, LUO HuiQian, WANG ZhaoSheng & WEN HaiHu National Laboratory for Superconductivity, institute of Physics, Chinese academy of {2., {3. 100190, china {3. National Laboratory for condensed matter Physics, institute of Physics, Chinese academy of {2., {3. 100190, china National Laboratory for Superconductivity Institute of Physics Chinese Academy of Sciences Beijing China beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China

In this paper we report the fabrication and superconducting properties of GdO1-xFxFeAs. It was found that when x is equal to 0.17, GdO0.83.0.17FeAs is a su-perconductor with the onset transition temperature Tcon ≈ 3..6 K. Resistivity anomaly near 13. K was observed for all samples up to x = 0.17, and such a phenomenon is similar to that of LaO1-xFxFeAs. Hall coefficient indicates that GdO1-xFxFeAs is conducted by electron-like charge carriers.

关键词： iron-based superconductor high-temperature superconductor

Carbon nanotube transistors with graphene oxide films as gate dielectrics

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Science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 828-833页

作者： FU WangYang,LIU Lei,WANG WenLong,WU MuHong,XU Zhi,BAI XueDong & WANG EnGe beijing National Laboratory for condensed {2. Physics,{3. of Physics,Chinese academy of sciences,beijing 100190,china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China

Carbon nanomaterials,including the one-dimensional(1-D) carbon nanotube(CNT) and two-dimensional(2.D) graphene,are heralded as ideal candidates for next generation *** essential component for the development of advanced nanoelectronics devices is processing-compatible ***,in analogy to the widespread use of silicon dioxide(SiO2. in silicon microelectronic industry,we report the proof-of-principle use of graphite oxide(GO) as a gate dielectrics for CNT field-effect transistor(FET) via a fast and simple solution-based processing in the ambient *** exceptional transistor characteristics,including low operation voltage(2.V),high carrier mobility(950 cm2.V-1 s-1),and the negligible gate hysteresis,suggest a potential route to the future all-carbon nanoelectronics.

关键词： carbon-based nanoelectronics graphene oxide gate dielectrics

High resistance modulation by the electric field based on La_(0.9)Sr_(0.1)MnO_3.SrTiO_3.Si structure

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Science china(Physics,Mechanics & Astronomy) 2009年第9期52卷 1299-1301页

作者： YANG Fang, HE Meng, WEN Juan, JIN KuiJuan, LU HuiBin & YANG GuoZhen beijing National Laboratory for condensed {2. Physics, {3. of Physics, Chinese academy of sciences, beijing 100190, china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China

A field-effect configuration based on La0.9Sr0.1MnO3.SrTiO3.Si structure is fabricated on Si substrate by laser molecular-beam epitaxy. The resistance modulation by electric field of the La0.9Sr0.1MnO3.SrTiO3.Si structure is investigated in detail. An evident resistance modulation effect is observed at 80 K. The channel resistance modulation by field effect reaches 1.4×107% and 2.6×106% when VDS are -2.and -6.5 V, respectively. The ON/OFF ratio of approximately 4000 is obtained. The present results are worthy of further investigations for potential applications of resistance modulation by electrostatic field in the heterostructures consisting of perovskite oxides and Si.

关键词： field effect perovskite oxide thin films resistance modulation

The guanidine hydrochloride-induced denaturation of CP43.and CP47 studied by terahertz time-domain spectroscopy

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Science china(Life sciences) 2007年第3期50卷 350-355页

作者： QU YuanGang1,3. CHEN Hua2. QIN XiaoChun1, WANG Li2. LI LiangBi1 & KUANG TingYun1 1 Key Laboratory of Photosynthesis and Environmental Molecular Physiology, institute of Botany, Chinese {3. of {2., beijing 100093. china 2.Laboratory of Optical Physics, institute of Physics and center for condensed matter Physics, Chinese {3. of {2., beijing 100080, china 3.Graduate University of Chinese {3. of {2., beijing 100049, china Key Laboratory of Photosynthesis and Environmental Molecular Physiology Institute of Botany Chinese Academy of SciencesBeijing 100093 China Graduate University of Chinese academy of sciences Beijing 100049 China Laboratory of Optical Physics Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 China Key Laboratory of Photosynthesis and Environmental Molecular Physiology Institute of Botany Chinese Academy of SciencesBeijing 100093 China

Terahertz time-domain spectroscopy (THz-TDS) is a new technique in studying the conformational state of a molecule in recent years. In this work, we reported the first use of THz-TDS to examine the dena- turation of two photosynthesis membrane proteins: CP43.and CP47. THz-TDS was proven to be useful in discriminating the different conformational states of given proteins with similar structure and in monitoring the denaturation process of proteins. Upon treatment with guanidine hydrochloride (GuHCl), a 1.8 THz peak appeared for CP47 and free chlorophyll a (Chl a). This peak was deemed to originate from the interaction between Chl a and GuHCl molecules. The Chl a molecules in CP47 interacted with GuHCl more easily than those in CP43.

关键词： CP The guanidine hydrochloride-induced denaturation of CP43.and CP47 studied by terahertz time-domain spectroscopy THz time

Impurity in Pairwise Entanglement of Heisenberg XX Open Chain

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Communications in Theoretical Physics 2007年第12期 1009-1016页

作者： XI Xiao-Qiang~(1,2.CHEN Wen-Xue~1 LIU Qi~3.and YUE Rui-Hong~3.1 Department of Applied Mathematics and Physics,Xi’an institute of Posts and Telecommunications,Xi’an 710061,china~2.Joint Laboratory of Advanced Technology in Measurements,{2. National Laboratory for condensed matter Physics,institute of Physics,the Chinese academy of sciences,{2. 100080,china~3.institute of Modern Physics,North-West University,Xi’an 710069,china Department of Applied Mathematics and Physics Xi'an Institute of Posts and Telecommunications Xi'an 710061 China Joint Laboratory of Advanced Technology in Measurements Beijing National Laboratory for Condensed Matter Physics Institute of Physics the Chinese Academy of Sciences Beijing 100080 China Department of Applied Mathematics and Physics Xi'an Institute of Posts and Telecommunications Xi'an 710061 China institute of Modern Physics North-West University Xi'an 710069 China

We calculate the concurrence of all pairwise entanglement of Heisenberg XX open chain with single systemimpurity in three-qubit and four-qubit cases,and find that the impurity parameter J_i has great effect on *** the proper parameter J_i,we can obtain the maximal pairwise entanglement of the nearestqubits and make the non-nearest qubits entangle.

关键词： system impurity pairwise entanglement Heisenberg XX chain

Interference pattern generation and simulation in the single beam of a white light continuum

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Science china(Physics,Mechanics & Astronomy) 2010年第6期53卷 1060-1064页

作者： YU ZhiHao & WENG YuXiang Laboratory of Soft matter Physics,institute of Physics,Chinese {2. of {3.,and National Laboratory of condensed matter Physics,beijing 100190,china Laboratory of Soft matter Physics Institute of Physics Chinese Academy of Sciences and National Laboratory of Condensed Matter Physics Beijing China

We demonstrate the interference phenomenon in the White Light Continuum(WLC) generated by a single femtosecond laser beam. Different kinds of spatial interference patterns of the WLC generation under various conditions were investigated. The spatial patterns were attributed to interference between the filaments in the WLC generated by the fundamental laser beam yielding the diffraction effect from spatial confinement. Simulations of different patterns were performed. By comparing the results of simulation with those of experiments,the distances of several micrometers between the neighboring filaments can be derived,which agree with the literature values from direct measurements.

关键词： interference supercontinuum generation ultrafast nonlinear optics

Oxygen vacancy induced magnetism in BaTiO_(3.δ) and Nb:BaTiO_(3.δ) thin films

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Science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 852-855页

作者： YANG Fang,JIN KuiJuan,LU HuiBin,HE Meng,WANG Cong,WEN Juan & YANG GuoZhen beijing National Laboratory for condensed {2. Physics,{3. of Physics,Chinese academy of sciences,beijing 100190,china beijing National Laboratory for condensed {2. Physics Institute of Physics Chinese Academy of Sciences Beijing China

The unusual magnetic properties are observed in oxygen deficient BaTiO3.δ(BTO) and Nb:BaTiO3.δ(BNTO) thin films fabricated on SrTiO3.substrates by laser molecular beam *** distinct magnetic hysteresis loops are observed in the oxygen deficient BTO and BNTO thin films in a temperature range of 5 to 3.0 K,whereas the diamagnetism is observed in both BTO and BNTO annealed at 1 atm of *** dopant Nb only enhances the magnetization in BNTO thin films,but has little effect on the *** magnetism of BTO and BNTO films is proposed to be the oxygen vacancies by origin.

关键词： oxygen vacancy magnetism BaTiO3.δ(BTO) Nb:BaTiO3.δ(BNTO) thin films

Electrolytes in solid-state dye-sensitized nanocrystalline solar cells

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Progress in Natural Science:Materials International 2006年第7期16卷 679-683页

作者： AN Hongli, XUE Bofei, LI Dongmei, MENG Qingbo and GUO Lin ( beijing National Laboratory for condensed {2. Physics, {3. of Physics, Chinese academy of sciences, beijing 100080, china Department of Material Science and Engineering, Bei Hang University, beijing 100083. china) Bei Hang Univ Dept Mat Sci & Engn Beijing 100083 Peoples R China Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100080 Peoples R China

In this paper, the structure and operating principle of the dye-sensitized nanocrystalline solar cells (DSSC) are dis- cussed. The electrolytes can be divided into three types: liquid electrolyte, quasi-solid electrolyte and solid electrolyte. Based on the relevant study of our group, we summarized mainly the research progress of the quasi-solid electrolyte and solid electrolyte in solid-state DSSC.

关键词： solar cells electrolytes solid-state dye-sensitized.

Probing Nuclear Symmetry Energy with Giant Dipole Resonances in Finite Nuclei

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原子核物理评论 2009年第S1期26卷 181-184页

作者： CAO Li-gang1,3.MA Zhong-yu2.3.(1 institute of Modern Physics,Chinese academy of {2.,Lanzhou 73.000,china 2.4} institute of Atomic Energy,beijing 102.13.china 3.center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 73.000,china) institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China china institute of Atomic Energy Beijing 102413China center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China

The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied. It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density. This linear correlation leads to the symmetry energy at the saturation density at the interval 3..0 MeV ≤ S(ρ0) ≤ 3..0 MeV,and the symmetry energy at ρ = 0.1 fm-3.at the interval 2..2.2..5 MeV. It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear {3..

关键词： symmetry energy dipole resonance Pygmy resonance