oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 255 )

2018 ( 1945 )

2017 ( 1839 )

Custom range...

Search Results: 1 - 10 of 124641 matches for " Wang Chuan-Kui "
All listed articles are free for downloading (OA Articles)
Page 1 /124641
Display every page Item
Effect of Lorentz local field correction on propagation of ultrashort laser pulse in one-dimensional para-nitroaniline (PNA) molecules

Zhou Yong,Miao Quan,Wang Chuan-Kui,

中国物理 B , 2011,
Abstract: This paper investigates the effect of Lorentz local field correction (LFC) on the propagation of ultrashort laser pulses in a para-nitroaniline molecular medium under resonant and nonresonant conditions by solving numerically the full-wave Maxwell-Bloch equations beyond slowly-varying envelope approximation and rotating-wave approximation. The effect of the LFC is considerably obvious when pulses with large areas propagate in the dense molecular medium. In the case of resonance, the group velocity of the sub-pulses split from the incident pulse along propagation is severely decreased by the LFC, especially for the latest sub-pulse. However, in the case of nonresonance, the influence of the LFC on the temporal evolution of the pulse is less obvious and lacks homogeneity with an increase in incident pulse area, propagation distance and molecular density.
One- and two-photon absorption properties of two metalloporphyrin complexes

Sun Yuan-Hong,Wang Chuan-Kui,

中国物理 B , 2011,
Abstract: The linear and nonlinear optical properties of two metalloporphyrin complexes formed by the complementary coordination of central zinc or magnesium ions to the ligand 5, 10, 15-tri-(p-tolyl)-20-phenylethynylporphyrin are theoretically investigated by using the analytic response theory at the density functional theory level. The results indicate that the studied complexes present more symmetric geometry structures than the ligand. The charge-transfer states of the two complexes in the lower energy region are all almost degenerate but those of the ligand are well separated. The ratio of the two-photon absorption cross sections of the ligand, zinc-porphyrin and magnesium-porphyrin complexes is 1.0:1.5:1.8, demonstrating that the two-photon absorption capability can be greatly increased when the ligand is coordinated with a metal ion. Moreover, several physical micro-mechanisms including electron transitions and intramolecular charge-transfer processes are discussed to explore the differences in optical property between the ligand and two complexes.
Dynamics of cooperative emissions in a cascade three-level molecular system driven by an ultrashort laser pulse

Liu Ji-Cai,Wang Chun-Xin,Gel''mukhanov Faris,Wang Chuan-Kui,

中国物理 B , 2008,
Abstract:
SPIN POLARIZATION IN A MODEL QUANTUM WIRE WITH A CROSS-SECTION

Wang Chuan-kui,Wang Hong-song,Zhang Qing-gang,

中国物理 B , 1999,
Abstract: Numerical investigation of the electronic structure of a small closed quantum system fabricated on the two-dimensional electron gas forming on the interference between GaAs and AlxGa1-xAs is reported. The Kohn-Sham spin-density-fun ctional theory is applied. Self-consistent results show that the quantum system assumes unequal numbers of electrons for spin up and spin down because of the existence of bound states. The profiles of effective potential energies for spin up and spin down electrons are then found to be very different, which will result in different transmission coefficients. It is notable that this spin polarization is caused by the geometry of the nanostructure.
ANDERSON TRANSITION IN THE AUBRY MODEL OF ONE-DIMENSIONAL INCOMMENSURATE SYSTEMS
一维无公度系统Aubry模型的Anderson转变

SUN JIN-ZUO,WANG CHUAN-KUI,
孙金祚
,王传奎

物理学报 , 1991,
Abstract: Using numerical calculation, it is found that there are extended states, intermadiate states and localized states in the Aubry model of one-dimensional incommensurate systems. The transition from extended states to localized states should pass through a regime in which the intermadiate states exist. The regime is situated at aboubt the potential strength V=2t. The new result is different from that of duality theory which predicts that all states are extended for V<2t, while, for V>2t all states are localized, at V = 2t there exists Anderson transition.
QUANTUM BOUND STATES OF ONE KIND OF BENT QUANTUM WIRES
一类弯曲量子线的量子束缚态

WANG CHUAN-KUI,JIANG ZHAO-TAN,
王传奎
,江兆潭

物理学报 , 2000,
Abstract: The ballistic transport properties of electrons in bent quantum wires are studied. The bent quantum wire composed of T-typed and single-bent quantum wires has finite length and connects to two semi-infinite quantum channels, which serve as emitter and collector when a potential difference is applied. The numerical results show that the conductance have two peaks at the energy of electrons less than the eigenvalue of the first transverse mode. Furthermore, these peaks are due to the resonant tunneling via bound states in the quantum structure. The detailed studies of these quantum bound states are shown in the paper.
Theoretical study on two-photon absorption properties of novel multi-branched compounds
新型多共轭链有机分子双光子吸收特性的理论研究

Sun Yuan-Hong,Wang Chuan-Kui,
孙元红
,王传奎

物理学报 , 2009,
Abstract: 在密度泛函理论水平上,利用解析响应函数方法研究了以(4-{2-[4-(2-吡啶-4-乙烯基)-苯基]-乙烯基}-苯基)-胺为基本结构单元的单支、双支和三支共轭链有机分子的单光子和双光子吸收特性.计算结果表明,这三种有机分子都具有较大的线性和非线性吸收强度.在紫外-可见光区域,它们的单光子吸收谱都存在两个峰,这与实验结果符合较好.在近红外区域,多共轭链有机分子呈现出宽达300 nm的宽带双光子吸收,单支、双支和三支分子的最大双光子吸收截面比约为1.0∶2.3∶4.0,其中三支分子具有最大的双光子吸收截面101.73×10-48 cm4·s.从理论上进一步证实,增加分子的共轭链可有效提高分子的双光子吸收特性.同时还给出了电荷转移态的电荷迁移过程.
The aggregation effects on the two-photon absorption properties of para-nitroaniline polymers by hydrogen-bond interactions

Sun Yuan-Hong,Li Jing,Zhao Ke,Wang Chuan-Kui,

中国物理 B , 2010,
Abstract: This paper has theoretically designed a series of aggregate polymers on the basis of several para-nitroaniline monomers by hydrogen-bond interactions. At the level of time-dependent hybrid density functional theory, it has optimized their geometrical structures and studied their two-photon absorption (TPA) properties by using analytical response theory. The calculated results exhibit that the aggregation effects not only bring out the considerable red shift of the excited energies but also greatly enhance the TPA intensities of the aggregate polymers in comparison with the para-nitroaniline monomer. The aggregate configurations also have an important influence on the TPA abilities of the polymers; the trimer has the largest TPA cross section. The electron transitions between the molecular orbits involving the strong TPA excitations of the trimer are depicted to illuminate the relationship between the intermolecular charge transfer and the TPA property.
The theoretical studies on the two-photon absorption properties of symmetric 1,4-bis{2-[4-(2-aryl)phenyl]vinyl}-2,5-bisdialkoxybenzenes

Sun Yuan-Hong,Li Long-He,Li Jing,Wang Chuan-Kui,

中国物理 B , 2010,
Abstract:
THE AMPLITUDE-N-TH POWERED SQUEEZING OF AN ELECTROMAGNETIC FIELD IN THE MULTIPHOTON JAYNES-CUMMINGS MODEL INTERACTING WITH THE SUPERPOSITION STATE

WANG JI-SUO,WANG CHUAN-KUI,SUN JIN-ZUO,HE JIN-YU,

中国物理 B , 1995,
Abstract:
Page 1 /124641
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.