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A Multiparty Controlled Bidirectional Quantum Secure Direct Communication and Authentication Protocol Based on EPR Pairs
CHANG Yan, ZHANG Shi-Bin, YAN Li-Li, SHENG Zhi-Wei
Chin. Phys. Lett. 2013, 30 (6):
060301
.
DOI: 10.1088/0256-307X/30/6/060301
A multiparty controlled bidirectional quantum secure direct communication and authentication protocol is proposed based on EPR pair and entanglement swapping. The legitimate identities of communicating parties are encoded to Bell states which act as a detection sequence. Secret messages are transmitted by using the classical XOR operation, which serves as a one-time-pad. No photon with secret information transmits in the quantum channel. Compared with the protocols proposed by Wang et al. [Acta Phys. Sin. 56 (2007) 673; Opt. Commun. 266 (2006) 732], the protocol in this study implements bidirectional communication and authentication, which defends most attacks including the 'man-in-the-middle' attack efficiently.
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Decoherence of Superradiant Scattering from Atoms without Confinement
WEN Ming-Xuan, NIU Lin-Xiao, WANG Zhong-Kai, ZHAI Yue-Yang, CHEN Xu-Zong, ZHOU Xiao-Ji
Chin. Phys. Lett. 2013, 30 (6):
060304
.
DOI: 10.1088/0256-307X/30/6/060304
We study the decoherence of superradiant Rayleigh scattering from condensed atoms without confinement, by using two same pumping pulses with an interval time. The first pulse is to establish a matter-wave grating, and the coherence between different momentum modes is measured by the second pulse after a variable interval time. Different from the case in the trap, the distruction of the grating owing to the phase perturbation is very fast, and the superradiant process is inhibited very soon afterwards for released atoms. A semi-classical model is applied to simulate this phase perturbation, and the calculation agrees with our experimental results.
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Bulk Properties of Hybrid Stars with the Color-Flavor Locked Quark Matter Core
WANG Hong-Yan, LIU Guang-Zhou, WU Yao-Rui, XU Yan, ZHU Ming-Feng, BAO Tmurbagan, ZHAO En-Guang
Chin. Phys. Lett. 2013, 30 (6):
061201
.
DOI: 10.1088/0256-307X/30/6/061201
We investigate the influence of the energy gap ( Δ) of the color-flavor locked (CFL) quark phase on the bulk properties of hybrid stars. The relativistic mean field model is used for hadronic matter and the MIT bag model for CFL quark matter. In our calculation results, we find that with the increase of the CFL energy gap there exists a transition behavior, which goes from the hadron star range through the transition range into the CFL quark star range. The observation data of PRS J1614-2230 are in the hadron star range (with Δ<40 MeV). We also find that with hyperons the equation of state (EOS) for the hybrid star matter with the CFL quark matter core has a small change, which can be disregarded.
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1S0 Nucleon Superfluidity in Neutron Star Matter
XU Yan, LIU Guang-Zhou, LIU Cheng-Zhi, FAN Cun-Bo, HAN Xing-Wei, ZHU Ming-Feng, WANG Hong-Yan, ZHANG Xiao-Jun
Chin. Phys. Lett. 2013, 30 (6):
062101
.
DOI: 10.1088/0256-307X/30/6/062101
We investigate the nucleon superfluidity in the 1S0 channel in neutron star matter using the relativistic mean field theory and the BCS theory. We discuss particularly the influence of the isovector scalar interaction which is considered by exchanging δ meson on the nucleon superfluidity. It is found that the δ meson leads to a growth of the nucleon 1S0 pairing energy gaps in a middle density range of the existing nucleon superfluidity. In addition, when the density ρB>0.36 fm?3, the proton 1S0 pairing energy gap obviously decreases. The density range of the proton 1S0 superfluidity is narrowed due to the presence of δ mesons. In our results, the δ meson not only changes the EOS and bulk properties but also changes the cooling properties of neutron stars.
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High-Spin Level Scheme of 120I
LI Li, SUN Ji, LI Jian, YU De-Yang, LIU Gong-Ye, ZHANG Wei-Tian, MA Ke-Yan, YANG Dong, MA Ying-Jun, WU Xiao-Guang, ZHU Li-Hua, HE Chuang-Ye, ZHENG Yun, YAO Shun-He, LI Cong-Bo, HU Shi-Peng, CAO Xue-Peng, WANG Jin-Long, YU Bei-Bei
Chin. Phys. Lett. 2013, 30 (6):
062301
.
DOI: 10.1088/0256-307X/30/6/062301
Excited states in 120I are investigated utilizing in-beam gamma-ray spectroscopy following the 114Cd(11B,5n) reaction at 70 MeV bombarding energy. A level scheme is constructed with states up to 9 MeV. The levels are classified into several bands and their possible configurations at low spins are discussed briefly. Based on the linking transitions between different bands at higher spins, the excitation energy of the previously reported T1/2=53 min isomer is ascertained to be 72 keV. Evidence showing the existence of an isomer at an excitation energy of 6.4 MeV is presented.
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Design of an Invisible Radome by Frequency Selective Surfaces Loaded with Lumped Resistors
LIU Li-Guo, LI You-Quan, MENG Qing-Zhi, WU Wei-Wei, MO Jin-Jun, FU Yun-Qi, YUAN Nai-Chang
Chin. Phys. Lett. 2013, 30 (6):
064101
.
DOI: 10.1088/0256-307X/30/6/064101
A novel radome is presented, which is transparent at operating frequency and is invisible out of band. In order to prevent reflection of the incoming power, frequency selective surfaces loaded with the lumped resistors are employed. To obtain the pass-band properties in lower frequencies, the convoluted slots are utilized. By comparison with the results obtained both by full wave analysis and by the measurements, the performance of the radome is verified. It performs with high transmission characteristics in band, and broadband absorbing properties out of band simultaneously. The oblique incidences are also investigated for both transmission coefficients and reflection ones.
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The Double-ended 750 nm and 532 nm Laser Output from PPLN-FWM
WANG Tao, LI Yu-Xiang, YAO Jian-Quan, GUO Ling, WANG Zhuo, HAN Sha-Sha, ZHANG Cui-Ying, ZHONG Kai
Chin. Phys. Lett. 2013, 30 (6):
064203
.
DOI: 10.1088/0256-307X/30/6/064203
We investigate 750 nm and 532 nm dual-wavelength laser for applications in the internet of things. A kind of optical maser is developed, in which the semiconductor module outputs the 808 nm pump light and then it goes into a double-clad Nd3+:YAG monocrystal optical fiber through the intermediate coupler and forms a 1064 nm laser. The laser outputs come from both left and right terminals. In the right branch, the laser goes into the right cycle polarization LinNbO3 (PPLN) crystal through the right coupler, produces the optical parametric oscillation and forms the signal light λ1 (1500 nm), the idle frequency light λ2 (3660.55 nm), and the second-harmonic of the signal light λ3 (750 nm). These three kinds of light and the pump light λ4 together form the frequency matching and the quasi-phase matching, then the four-wave mixing occurs to create the high-gain light at wavelength 750 nm. Meanwhile, in the left branch, the laser goes into the left PPLN crystal through the left coupler, engenders frequency doubling and forms the light at wavelength 532 nm. That is to say, the optical maser provides 750 nm and 532 nm dual-wavelength laser outputting from two terminals, which is workable.
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The Spectral Broadening of Motional Stark Effect in the HL-2A Tokamak
JIANG Nan, YU De-Liang, YAN Long-Wen, CAO Jian-Yong, ZHONG Wu-Lu, CHEN Cheng-Yuan, LIU Yi, LEI Guang-Jiu, YANG Qing-Wei, DUAN Xu-Ru
Chin. Phys. Lett. 2013, 30 (6):
065201
.
DOI: 10.1088/0256-307X/30/6/065201
The spectral broadening of motional Stark effect (MSE) is simulated in the HL-2A tokamak, which is in good agreement with the experimental observation. The divergence angle of the neutral beam, finite lens size and beam energy dissociation are the main broadening factors, while the lens size is the most important one. The experimental spectra fitted by multiple Gaussian distributions reveal that the Stark splitting and its full width at half maximum (FWHM) are ~0.07 nm and ~0.19 nm, respectively. Therefore, the π and σ components of the MSE will overlap since the Stark splitting is much smaller than its spectral broadening. A narrowband filter with the FWHM of about 0.16 nm is good enough to isolate the two components for providing the polarization fraction over 50%, which guarantees reasonable measurement precision for magnetic field pitch angle.
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First-Principles Study of Ag-Doped GaAs Nanowires
WAN Lei, GAO Tao, MA Shi-Jia, LU Peng-Fei, LI Peng
Chin. Phys. Lett. 2013, 30 (6):
066101
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DOI: 10.1088/0256-307X/30/6/066101
The structural and electronic properties of undoped and Ag-doped unpassivated wurtzite GaAs nanowires (NWs), as well as their stability, are investigated within the first-principles frame. The calculated formation energies show that the single Ag energetically prefers to substitute the surface Ga (Ef=?0.529 eV) under As-rich conditions, and creates a much shallower (0.19 eV above the Fermi) acceptor level, which is of typical p-type character. With the increase in the Ag concentration, the p-type behavior gradually weakens and the n-type character arises. Thus, one can expect to synthesize Ag-doped GaAs NWs for p-type or n-type applications by controlling their Ag concentration and microarrangement.
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The Origin of BC7 Sheet Metallicity and the Tuning of its Electronic Properties by Hydrogenation
LEI Xue-Ling, LIU Gang, WU Mu-Sheng, XU Bo, OUYANG Chu-Ying, PAN Bi-Cai
Chin. Phys. Lett. 2013, 30 (6):
066102
.
DOI: 10.1088/0256-307X/30/6/066102
Using first-principles calculations, we investigate the structural, electronic and hydrogenated properties of the hexagonal BC7 sheet. The computed energy bands and density of states indicate that the BC7 sheet is a metal, and its metallicity mainly originates from the non-bonding pz electrons of the diagonal carbon of the B atom. When these carbon atoms are fully passivated by H atoms, the BC7 sheet becomes a semiconductor with a band gap of 2.41 eV. Our studies demonstrate that changing both the proportion of the boron atoms in the boron carbon sheet and its hydrogenation can tune the electronic properties of boron carbon two-dimensional material.
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Energy Diagrams of Dielectric Elastomer Generators under Different Types of Deformation
WANG Yin, ZHOU Jin-Xiong, WU Xiao-Hong, LI Bo, ZHANG Ling
Chin. Phys. Lett. 2013, 30 (6):
066103
.
DOI: 10.1088/0256-307X/30/6/066103
We address the effects of various deformation modes, equibiaxial tension, uniaxial tension and pure shear on the energy diagrams and stability restrictions of a dielectric elastomer (DE) generator. It is shown that the stability restrictions, as well as the maximum energy that can be converted, are deformation-dependent. DE generators working under the pure shear state can avert electromechanical instability provided that tensile stress prevails over the membrane. The energy output in the pure shear state is lower than that of equibiaxial tension, but much higher than that of uniaxial tension.
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First-Principles Study of the Structural, Electronic and Optical Properties of Hexagonal LiIO3
YAO Gang, CHEN Yu, AN Xin-You, JIANG Zhong-Qian, CAO Lin-Hong, WU Wei-Dong, ZHAO Yan
Chin. Phys. Lett. 2013, 30 (6):
067101
.
DOI: 10.1088/0256-307X/30/6/067101
The structural parameters, electronic structure, chemical bonding and optical properties of hexagonal LiIO3 are investigated in the framework of density functional theory. The calculated lattice parameters are in agreement with the previous experimental work. The band structure, density of states, and Mulliken charge population are obtained, and indicate that hexagonal LiIO3 has an indirect band gap of 2.81 eV. Furthermore, the optical properties are also calculated and analyzed in detail. It is shown that hexagonal LiIO3 is a promising dielectric material.
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Electronic Band Profile and Optical Response of Spinel MgIn2O4 through Modified Becke–Johnson Potential
A. Manzar, G. Murtaza, R. Khenata, S. Muhammad, Hayatullah
Chin. Phys. Lett. 2013, 30 (6):
067401
.
DOI: 10.1088/0256-307X/30/6/067401
We employ the first-principles technique based on the modified Becke–Johnson (BJ) exchange potential for the prediction of the electronic band structure, optical properties, and electron density of the cubic MgIn2O4 spinel compound. It is found that the calculated band gap value with the modified BJ approximation is significantly improved over the results based on the generalized gradient approximation and the local density approximation in comparison to the experimental data. The band gap dependent optical parameters such as the dielectric constant, refractive index, reflectivity, optical conductivity, and electron density are predicted. The optical response suggests that MgIn2O4 is an applicant material in optoelectronic devices in various parts of the energy spectrum like MgAl2O4 and MgGa2O4.
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Doping Evolution of Nodal Band Renormalization in Bi2Sr2CuO6+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
PENG Ying-Ying, MENG Jian-Qiao, ZHAO Lin, LIU Yan, HE Jun-Feng, LIU Guo-Dong, DONG Xiao-Li, HE Shao-Long, ZHANG Jun, CHEN Chuang-Tian, XU Zu-Yan, ZHOU Xing-Jiang
Chin. Phys. Lett. 2013, 30 (6):
067402
.
DOI: 10.1088/0256-307X/30/6/067402
High resolution laser-based angle-resolved photoemission measurements are carried out on Bi2Sr2CuO6+δ superconductor covering a wide doping range from heavily underdoped to heavily overdoped samples. Two obvious energy scales are identified in the nodal dispersions: one is the well-known 50–80 meV high energy kink and the other is <10 meV low energy kink. The high energy kink increases monotonously in its energy scale with increasing doping and shows weak temperature dependence, while the low energy kink exhibits a non-monotonic doping dependence with its coupling strength enhanced sharply below Tc. These systematic investigations on the doping and temperature dependence of these two energy scales favor electron-phonon interactions as their origin. They point to the importance in involving the electron-phonon coupling in understanding the physical properties and the superconductivity mechanism of high temperature cuprate superconductors.
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Characteristics of 355 nm Laser Damage in Bulk Materials
YU Zhen-Kun, HE Hong-Bo, QI Hong-Ji, FANG Zhou, LI Da-Wei
Chin. Phys. Lett. 2013, 30 (6):
067801
.
DOI: 10.1088/0256-307X/30/6/067801
The laser damage resistances of four crystals (CaF2, MgF2, Al2O3, and SiO2) and fused silica (JGS1) irradiated at 355 nm (8 ns, 300-on-1) are reported. The laser-induced damage threshold is measured using a tripled Nd:YAG laser system. The results obtained from the pure crystals are in accordance with their specific optical, mechanical, and thermal properties. An empirical law based on the Franz–Keldysh effect can interpret the experimental results.
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Giant Magnetoimpedance Effect in a Sandwiched Structure of as-Quenched FeNiCrSiB Ribbons
CHEN Wei-Ping, LI Zhi-Gang, SHAO Xian-Yi, ZHONG Wen-Wu, LI Qin-Tao, LIU Yan-Ping
Chin. Phys. Lett. 2013, 30 (6):
067802
.
DOI: 10.1088/0256-307X/30/6/067802
The giant magnetoimpedance (GMI) effect and effective permeability ratio in a QFR/Cu/QFR sandwiched structure are studied, where QFR stands for the as-quenched FeNiCrSiB amorphous ribbon. Remarkable GMI effects are obtained in the QFR/Cu/QFR sandwiched structure without annealing. The maximum values of the longitudinal and transverse GMI ratios at 0.5 MHz are 282% and 408%, respectively. Correspondingly, the maximum effective permeability ratios at 0.5 MHz are 326% and 1013% in longitudinal and transverse field, respectively. These large GMI values are attributed to the high effective permeability of the sample due to the closed alternating current (ac) magnetic flux path in the sandwiched structure, and large permeability variation induced by the magnetic field.
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Raman Spectra of Deuterated Potassium Dihydrogen Phosphate Crystals with Different Degrees of Deuteration
LIU Bao-An, ZHOU Hai-Liang, ZHANG Qing-Hua, XU Ming-Xia, JI Shao-Hua, ZHU Li-Li, ZHANG Li-Song, LIU Fa-Fu, SUN Xun, XU Xin-Guang
Chin. Phys. Lett. 2013, 30 (6):
067804
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DOI: 10.1088/0256-307X/30/6/067804
The polarized Raman spectra of deuterated potassium dihydrogen phosphate crystals with different deuterium concentrations are measured. With the increasing deuterium concentration, the Raman peaks which are assigned as the internal vibrations of the (H/D)2PO4? anion shift to lower wavenumbers. This red-shift contributes to the decrease in the bonding force of the P–O bond as a result of the substitution of deuterium for hydrogen. Moreover, the intensity of the strongest peak of these crystals decreases first, and reaches the minimum value while the mole percentage of the deuterium content in the crystal is about 74%. After that, the intensity increases with the increase of the deuterium concentration in the crystal.
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The Growth and Fabrication of InGaN/GaN Multi-Quantum Well Solar Cells on Si(111) Substrates
LI Zhi-Dong, XIAO Hong-Ling, WANG Xiao-Liang, WANG Cui-Mei, DENG Qing-Wen JING Liang, DING Jie-Qin, WANG Zhan-Guo, HOU Xun
Chin. Phys. Lett. 2013, 30 (6):
068402
.
DOI: 10.1088/0256-307X/30/6/068402
Metalorganic chemical vapor deposition of a crack-free mirror-like surface of InGaN/GaN MQWs on Si (111) substrate is demonstrated, and an InGaN/GaN MQWs solar cell device is fabricated. Photo response measurement of the solar cell devices shows that the fill factor FF = 49.4%, open circuit voltage Voc=0.32 V, and short circuit current Jsc=0.07 mA/cm2, under AM 1.5 G illumination. In order to analyze the influence of material quality on the performance of solar cells, XRD, SEM and Raman scattering experiments are carried out. It is found that insertion of a proper top AlN layer can effectively improve the material quality, and therefore enhance the photovoltaic performance of the fabricated device.
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A Label-Free Detection of Biomolecules Using Micromechanical Biosensors
Meisam Omidi, M. A. Malakoutian, Mohammadmehdi Choolaei, F. Oroojalian, F. Haghiralsadat, F. Yazdian
Chin. Phys. Lett. 2013, 30 (6):
068701
.
DOI: 10.1088/0256-307X/30/6/068701
A Microcantilevers resonator is used to detect a protein biomarker called prostate specific antigen (PSA), which is associated with prostate cancer. Different concentrations of PSA in a buffer solution are detected as a function of deflection of the beams. For this purpose, we use a surface micromachined, antibody-coated polycrystalline silicon micromechanical cantilever beam. Cantilevers have mass sensitivities of the order of 10–17 g/Hz, which result from their small mass. This matter allows them to detect an immobilized antibody monolayer corresponding to a mass of about 70 fg. With these devices, concentrations as low as 150 fg/mL, or 4.5 fM, could be detected from the realistic samples.
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The Effects of Electrical Stimuli on Calcium Change and Histamine Release in Rat Basophilic Leukemia Mast Cells
ZHU Dan, WU Zu-Hui, CHEN Ji-Yao, ZHOU Lu-Wei
Chin. Phys. Lett. 2013, 30 (6):
068702
.
DOI: 10.1088/0256-307X/30/6/068702
We apply electric fields at different frequencies of 0.1, 1, 10 and 100 kHz to the rat basophilic leukemia (RBL) mast cells in calcium-containing or calcium-free buffers. The stimuli cause changes of the intracellular calcium ion concentration [Ca2+]i as well as the histamine. The [Ca2+]i increases when the frequency of the external electric field increases from 100 Hz to 10 kHz, and then decreases when the frequency further increases from 10 kHz to 100 kHz, showing a peak at 100 kHz. A similar frequency dependence of the histamine release is also found. The [Ca2+]i and the histamine releases at 100 Hz are about the same as the values of the control group with no electrical stimulation. The ruthenium red (RR), an inhibitor to the TRPV (transient receptor potential (TRP) family V) channels across the cell membrane, is used in the experiment to check whether the electric field stimuli act on the TRPV channels. Under an electric field of 10 kHz, the [Ca2+]i in a calcium-concentration buffer is about 3.5 times as much as that of the control group with no electric stimulation, while the [Ca2+]i in a calcium-free buffer is only about 2.2 times. Similar behavior is also found for the histamine release. RR blockage effect on the [Ca2+]i decrease is statistically significant (~75%) when mast cells in the buffer with calcium are stimulated with a 10 kHz electric field in comparison with the result without the RR treatment. This proves that TRPVs are the channels that calcium ions inflow through from the extracellular environment under electrical stimuli. Under this condition, the histamine is also released following a similar way. We suggest that, as far as an electric stimulation is concerned, an application of ac electric field of 10 kHz is better than other frequencies to open TRPV channels in mast cells, and this would cause a significant calcium influx resulting in a significant histamine release, which could be one of the mechanisms for electric therapy.
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The Generalized f(R) Model with Coupling in 5D Spacetime
WU Ya-Bo, ZHAO Yue-Yue, LU Jian-Bo, LI Jian, ZHANG Wen-Xin, CHANG Hong
Chin. Phys. Lett. 2013, 30 (6):
069801
.
DOI: 10.1088/0256-307X/30/6/069801
The generalized f(R) gravity with coupling in five-dimensional (5D) spacetime is studied on the basis of both the 4D generalized f(R) gravity with coupling and the pure f(R) gravity without coupling in 5D spacetime. Specifically, by assuming a hypersurface-orthogonal space-like Killing vector field in 5D spacetime, the generalization of the 4D generalized f(R) gravity to 5D can be realized, which can give the reduced 4-metric coupled with two scalar fields. In particular, we discuss a special class of models, i.e., f1(R)=f2(R)=αRm (m≠1), and choose B(Lm)=Lm=?ρ in the homogeneous and isotropic cosmology with the 4D Friedmann–Robertson–Walker metric. The numerical analysis shows that the parameter m can be constrained by means of the current observations for the deceleration parameter, which implies that this generalized f(R) model with coupling in 5D spacetime can account for the present accelerated expansion of the universe.
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62 articles
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