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A shortcut for determining growth mode

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Chinese physics B 2013年第10期22卷 493-499页

作者： R.A.Rehman 蔡亦良张寒洁吴珂窦卫东李海洋何丕模鲍世宁 physics department Zhejiang University physics department Forman Christian College University

Thin and thick films of iron phthalocyanine （FePc） molecules are deposited on a Ag （110） surface. The nature of the FePc growth and the interaction with the substrate have been studied by X-ray photoelectron spectroscopy （XPS）. All of the core level spectra exhibit rigid shifts towards lower binding energies following the deposition of the organic films, each by a different magnitude. A greater change and a larger shift in the Fe2p level as compared to Cls core level reveals that the adsorbate interacts with the substrate mainly via the Fe atom, located at the center of the molecule. An increase/decrease in the intensity of C1 s/Ag3d level is found to be exponentially linked to the overlayer molecular coverage. Finally, the so- called growth/decay curve indicates that FePc thin films initially develop following the FM growth mode and then transform to SK mode, resulting in 3D island aggregation.

关键词： iron phthalocyanine silver growth modes X-ray photoelectron spectroscopy

Progress in superconducting qubits from the perspective of coherence and readout

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Chinese physics B 2013年第11期22卷 76-90页

作者：钟有鹏李春燕王浩华陈宇 department of physics Zhejiang University department of physics University of CaliforniaSanta Barbara

Superconducting qubits are Josephson junction-based circuits that exhibit macroscopic quantum behavior and can be manipulated as artificial atoms. Benefiting from the well-developed technology of microfabrication and microwave engineering, superconducting qubits have great advantages in design flexibility, controllability, and scalability. Over the past decade, there has been rapid progress in the field, which greatly improved our understanding of qubit decoherence and circuit optimization. The single-qubit coherence time has been steadily raised to the order of 10 to 100 p.s, allowing for the demonstration of high-fidelity gate operations and measurement-based feedback control. Here we review recent progress in the coherence and readout of superconducting qubits.

关键词： superconducting qubit Josephson junction quantum non-demolition measurement decoherence

Properties of hyperon stars rotating at Keplerian frequency

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Chinese physics B 2011年第2期20卷 592-600页

作者：文德华陈伟 department of physics South China University of Technology department of physics Jinan University

The structure and properties of a Keplerian rotating hyperon star with an equation of state （EOS） investigated using the relativistic σ-ω-p model are examined by employing an accurate numerical scheme. It is shown that there is a clear rotating effect on the structure and properties, and that hyperon star matter cannot support a star with a mass larger than 1.9 M~, even a star rotating at the fastest allowed frequency. The constraints of the two known fastest rotating frequencies （716 Hz and 1122 Hz） on the mass and radius of a hyperon star are also explored. ~rthermore, our results indicate that the imprint of the rapid rotation of a hyperon star on the moment of inertia is clear; the backward equatorial redshift, the forward equatorial redshift and the polar redshift can be distinguished clearly, the forward equatorial redshift is always negative; and its figuration is far from a spherical symmetric shape.

关键词： equation of state hyperon star moment of inertia redshift

Nonequilibrium dynamics in two-dimensional Ising spin glass

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Chinese physics B 2011年第4期20卷 465-470页

作者：张开成朱岩 department of physics Bohai University department of physics Nanjing University of Aeronautics and Astronautics

This paper investigates the nonequilibrium dynamics of two-dimensional Ising spin glass by dynamical Monte Carlo simulations. A new method is developed to quantitatively measure the age of domain growth. Using this method it investigates how temperature shift affects the effective age of domain growth. It finds that the T-shift dependence of the effective age follows the prediction of the droplet model quite well. It also investigates the overlap length between the spin glass states as well as the correlated flips of spins, which are not consistent with the theoretical predictions. The possible reasons are discussed.

关键词： nonequilibrium effective age site-overlap droplet model

Failure of the free energy relation under a non-Markovian heat bath temperature change

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Chinese physics B 2012年第9期21卷 1-6页

作者：曹亮 Michael Cross 郑志刚 department of physics Beijing Normal University department of physics California Institute of Technology

We investigate the free energy relation for a system contacting with a non-Markovian heat bath and find that the validity of the relation sensitively depends on the non-Markovian memory effect, which is especially related go the initial preparation effect. This memory effect drives the statistical distribution of the system out of the initial preparation, even if the system starts from an equilibrium state. This leads to the violation of the free energy relation. A possible way of eliminating this memory effect is proposed.

关键词： free energy relation non-Markovian heat bath initial preparation effect

GGA+U study of the electronic energy bands and state density of the wurtzite In_(1-x)Ga_xN

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Chinese physics B 2013年第12期22卷 58-64页

作者：王伟华赵国忠梁希侠 department of physics Inner Mongolia University department of physics Capital Normal University

The electronic band structures, densities of states （DOSs）, and projected densities of states （PDOSs） of the wurtzite In1-xGaxN with x=0, 0.0625, 0.125 are studied using the generalized-gradient approximation （GGA） and GGA＋U in density functional theory. Our calculations suggest that in the case of wurtzite InN it is important to apply an on-site Hubbard correction to both the d states of indium and the p states of nitrogen in order to recover the correct energy level symmetry and obtain a reliable description of the InN band structure. The method is used to study the electronic properties of the wurtzite In1-xGaxN. The conduction band minimum （CBM） energy increases, while the valence band maximum （VBM） energy decreases with the increase of the gallium concentration. The effect leads to broadening the band gap （BG） and the valence band width （VBW）. Furthermore, the compressive strain in the crystal can cause the BG and the VBW to increase with the increase of gallium concentrations.

关键词： GGA+U electronic structures projected density of states In1-xGaxN

Generalized projective synchronization of the fractional-order chaotic system using adaptive fuzzy sliding mode control

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Chinese physics B 2014年第10期23卷 64-70页

作者：王立明唐永光柴永泉吴峰 department of physics Langfang Teachers College department of physics Tianjin University of Technology

An adaptive fuzzy sliding mode strategy is developed for the generalized projective synchronization of a fractional- order chaotic system, where the slave system is not necessarily known in advance. Based on the designed adaptive update laws and the linear feedback method, the adaptive fuzzy sliding controllers are proposed via the fuzzy design, and the strength of the designed controllers can he adaptively adjusted according to the external disturbances. Based on the Lya- punov stability theorem, the stability and the robustness of the controlled system are proved theoretically. Numerical simu- lations further support the theoretical results of the paper and demonstrate the efficiency of the proposed method. Moreover, it is revealed that the proposed method allows us to manipulate arbitrarily the response dynamics of the slave system by adjusting the desired scaling factor λi and the desired translating factor ηi, which may be used in a channel-independent chaotic secure communication.

关键词： generalized projective chaos synchronization fuzzy sliding mode control fractional order chaoticsystem

On some classes of two-dimensional local models in discrete two-dimensional monatomic FPU lattice with cubic and quartic potential

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Chinese physics B 2009年第1期18卷 259-268页

作者：徐权田强 department of physics Daqing Normal University department of physics Beijing Normal University

This paper discusses the two-dimensional discrete monatomic Fermi- Pasta-Ulam lattice, by using the method of multiple-scale and the quasi-discreteness approach. By taking into account the interaction between the atoms in the lattice and their nearest neighbours, it obtains some classes of two-dimensional local models as follows： two-dimensional bright and dark discrete soliton trains, two-dimensional bright and dark line discrete breathers, and two-dimensional bright and dark discrete breather.

关键词： two-dimensional bright and dark discrete soliton trains two-dimensional bright and dark discrete breathers two-dimensional bright and dark line discrete breathers

Optical Characterization of Amorphous Hydrogenated Carbon(a-C:H)Thin Films Prepared by Single RF Plasma Method

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Plasma Science and Technology 2015年第6期17卷 488-495页

作者： Dogan MANSUROGLU Kadir GOKSEN Sinan BILIKMEN physics department Middle East Technical University physics department Duzce University

Methane （CH4） plasma was used to produce amorphous hydrogenated carbon （a- C：H） films by a single capacitively coupled radio frequency （RF） powered plasma system. The system consists of two parallel electrodes： the upper electrode is connected to 13.56 MHz RF power and the lower one is connected to the ground. Thin films were deposited on glass slides with different sizes and on silicon wafers. The influence of the plasma species on film characteristics was studied by changing the plasma parameters. The changes of plasma species during the deposition were investigated by optical emission spectroscopy （OES）. The structural and optical properties were analyzed via Fourier transform infrared （FTIR） spectroscopy, X-ray diffraction （XRD） and UV-visible spectroscopy, and the thicknesses of the samples were measured by a profilometer. The sp3/sp2 ratio and the existing H atoms play a significant role in the determination of the chemical properties of thin films in the plasma. The film quality and deposition rate were both increased by raising the power and the flow rate.

关键词： a-C:H thin film plasma deposition methane plasma sp3/sp2 ratio