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There are 20 papers published in subject: > since this site started. |
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1. Plasmons in Nitrogen-doped graphene and gold film composite nanostructure | |||
Shu Xiaoqin | |||
Physics 24 June 2016 | |||
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Abstract:Using time depended density function theory(TDDFT), the absorption spectra of the Nitrogen-doped graphene and gold film composite nanostructure when the pulse excitation polarized in the X-axis, Y-axis, Z-axis direction, respectively. When the pulse excitation polarized in the X-axis and Y-axis direction the energy points are in the visible region. The induced charge density distribution indicates the charge transform plasmon (CTP)mode. The material is expected to splitting water using visible light. | |||
TO cite this article:Shu Xiaoqin. Plasmons in Nitrogen-doped graphene and gold film composite nanostructure[OL].[24 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4698508 |
2. Solutions of Maxwell Equation of a Lattice System with Meissner Effect | |||
Qiang Li | |||
Physics 16 April 2015 | |||
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Abstract:We show that Maxwell equation of a lattice system may have Meissner effect solutions when all carriers are surface state electrons. Some limitations on the wave function distributions of electrons in the system are identified. | |||
TO cite this article:Qiang Li. Solutions of Maxwell Equation of a Lattice System with Meissner Effect[OL].[16 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4639392 |
3. Possibility of superradiant phase transitions in coupled two-level atoms | |||
Tao Liu,Yu-Yu Zhang,Qing-Hu Chen,Ke-Lin Wang | |||
Physics 10 October 2014 | |||
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Abstract:Although the oscillator strength sum rule forbids the phase transition in ideal non-interacting two-level atoms systems, we present the possibility of the quantum phase transition in the coupled two-level atoms in a cavity. The system undergoes the superradiant phase transition in the thermodynamics limit and this transition is account for the atom-atom attractive interaction, exhibiting a violation of the sum rule. The bosonic coherent state technique has been adopted to locate the quantum critical point accurately in the finite-size system. We predict the existence of the superadiant phase transition as the number of atoms increases, satisfying all the constraints imposed by the sum rule. | |||
TO cite this article:Tao Liu,Yu-Yu Zhang,Qing-Hu Chen, et al. Possibility of superradiant phase transitions in coupled two-level atoms[OL].[10 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4612964 |
4. Quantum Correlations in Two Interacting Atom Ensembles | |||
Zhang Yu-Yu, Chen Wang | |||
Physics 30 September 2014 | |||
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Abstract:The power-law scaling behaviors of the quantum discordand the scaled concurrence are presented in two coupledatom ensembles, which exhibit the Dicke-like quantum phase transition. In the super-excitation phase, the quantum discord reaches its maximum beyond the critical point and then decreases monotonically, which is ascribed to the double-degenerated ground state in the strong coupling limit. However, the scaled concurrence exhibits the maximum atomic quantum entanglement at the critical point. Moreover, we find that the persistence of thequantum discord is suppressed by different asymmetric effects in the super-excitation phase. | |||
TO cite this article:Zhang Yu-Yu, Chen Wang. Quantum Correlations in Two Interacting Atom Ensembles[OL].[30 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4612044 |
5. Generalized rotating-wave approximation to biased qubit-oscillator systems | |||
Yu-Yu Zhang, Qing-Hu Chen, and Yang Zhao | |||
Physics 19 September 2014 | |||
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Abstract:The generalized rotating-wave approximation with counter-rotatinginteractions has been applied toa biased qubit-oscillator system. Analytical expressions are explicitly givenfor all eigenvalues and eigenstates. For a flux qubit coupled to superconducting oscillators,spectra calculated by our approach are in excellent agreement with experiment.Calculated energy levels for a variety of biases also agree wellwith those obtained via exact diagonalization for a wide range of coupling strengths.Dynamics of the qubit has also been examined, and results lend further support to the validity of theanalytical approximation employed here. Our approachcan be readily implemented andapplied to superconductingqubit-oscillator experiments conducted currently and in the near futurewith a biased qubit and for all accessible coupling strengths. | |||
TO cite this article:Yu-Yu Zhang, Qing-Hu Chen, and Yang Zhao. Generalized rotating-wave approximation to biased qubit-oscillator systems[OL].[19 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4610619 |
6. Magnetic miniband and magnetotransport property of a graphene superlattice | |||
Jiang Liwei,Zheng Yisong | |||
Physics 30 November 2010 | |||
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Abstract:The eigen energy and the conductivity of a graphene sheet subject to a one-dimensional cosinusoidal potential and in the presence of a magnetic field are calculated. Such a graphene superlattice presents three distinct magnetic miniband structures as the magnetic field increases. They are, respectively, the triply degenerate Landau level spectrum, the nondegenerate minibands with finite dispersion and the same Landau level spectrum with the pristine graphene. The ratio of the magnetic length to the period of the potential function is the characteristic quantity to determine the electronic structure of the superlattice. Corresponding to these distinct electronic structures, the diagonal conductivity presents very strong anisotropy in the weak and moderate magnetic field cases. But the predominant magnetotransport orientation changes from the transverse to the longitudinal direction of the superlattice. More interestingly, in the weak magnetic field case, the superlattice exhibits half-integer quantum Hall effect, but with large jump between the Hall plateaux. Thus it is different from the one of the pristine graphene. | |||
TO cite this article:Jiang Liwei,Zheng Yisong. Magnetic miniband and magnetotransport property of a graphene superlattice[J]. |
7. Depinning and creep in Josephson junction arrays in weak magnetic fields | |||
Huan Liu,Zhou Wei,Chen Qing Hu | |||
Physics 07 January 2009 | |||
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Abstract:Based on resistively shunted junction dynamics, we have numerically studied the depinning transition and thermally activated creep motion of vortices in two-dimensional Josephson junction arrays exposed to a weak external field with the filling factor $f=1/25$. Whether the bond disorder is introduced into the system or not, a continuous depinning transition is found at zero temperature. By means of scaling analysis of the current-voltage characteristics, a non-Arrhenius creep law is observed at finite temperatures, with the existence of two universality classes depending on the strength of the bond disorder. The effects of the disorder on the critical current and critical exponents are also discussed. | |||
TO cite this article:Huan Liu,Zhou Wei,Chen Qing Hu. Depinning and creep in Josephson junction arrays in weak magnetic fields[OL].[ 7 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27408 |
8. Phase transition in site-diluted Josephson-junction arrays | |||
Lv Jian-Ping ,Liu Huan ,Chen Qing Hu | |||
Physics 05 January 2009 | |||
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Abstract:Intriguing effects produced by random percolative disorder in two-dimensional Josephson-junction arrays are studied by means of large-scale numerical simulations. Using dynamic scaling analysis, we evaluate critical temperatures and critical exponents in high accuracy. Our results not only are in good agreement with the recent experimental findings, but also shed some lights on the relevant phase transitions. | |||
TO cite this article:Lv Jian-Ping ,Liu Huan ,Chen Qing Hu. Phase transition in site-diluted Josephson-junction arrays[OL].[ 5 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27356 |
9. The influence of the Dresselhaus spin-orbit coupling on the tunneling magnetoresistance in ferromagnet/semiconductor/ferromagnet tunnel junctions | |||
Wang Xiaohua,An Xingtao,Liu Jianjun | |||
Physics 17 June 2008 | |||
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Abstract:We investigate the effect of Dresselhaus spin-orbit coupling (SOC) on the spin-transport properties of the ferromagnet (FM)/semiconductor (SM)/ferromagnet (FM) double-barrier structures. Due to the thin oxide layers at the interfaces between the FM and the SM, caused by experimental preparation technique, the thickness of the insulator (IN) between the FM and the SM should be considered theoretically. Using a transfer-matrix method, we calculate the transmission, polarization and tunneling magnetoresistance (TMR) of the structure. Our results indicate that (i) the polarization can be enhanced by reducing the IN layers at zero temperature and (ii) the TMR inversion observed experimentally can be illustrated by the influence of the Dresselhaus SOC effect. The theoretical results explain qualitatively the polarization and the TMR characteristics revealed in the experiment. Taking into account the Dresselhaus SOC effect, the TMR inversion occurs when the energy of a localized state in the barrier matches the Fermi energy of the ferromagnetic electrodes. | |||
TO cite this article:Wang Xiaohua,An Xingtao,Liu Jianjun. The influence of the Dresselhaus spin-orbit coupling on the tunneling magnetoresistance in ferromagnet/semiconductor/ferromagnet tunnel junctions[OL].[17 June 2008] http://en.paper.edu.cn/en_releasepaper/content/22301 |
10. Electrically controlled Kerr effect in magnetophotonic crystal based on nematic liquid crystal | |||
Da Haixia,Xu Ping,Wu Jianchun,Li Zhenya | |||
Physics 21 February 2008 | |||
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Abstract:An electrically controllable Kerr effect in magnetophotonic crystal consisting of magnetic materials and nematic liquid crystals is presented based on the properties of nematic liquid crystals. Numerical results show that Kerr effect is changed remarkably by adjusting the permittivity of liquid crystal, and the maximum value of kerr rotation angle becomes large as the permittivity of liquid crystal increases. Such properties demonstrate the possibility of tunable magneto-optical devices based on nematic liquid crystal. | |||
TO cite this article:Da Haixia,Xu Ping,Wu Jianchun, et al. Electrically controlled Kerr effect in magnetophotonic crystal based on nematic liquid crystal[OL].[21 February 2008] http://en.paper.edu.cn/en_releasepaper/content/18768 |
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