FU RONG-TANG

Fudan University

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Xin Sun

Zhejiang Shuren University

FU ROU-LI

Shanghai Institute of Technical Physics

Jian Zi

Fudan University

Xinhua Hu

Fudan University

Hongjuan Ye

Shanghai East Hospital

Rouli Fu

Institute of Theoretical Physics

Yizhou Li

Ocean University of China

Chang-Qin Wu

Guangdong Ocean University

Yifeng Shen

Chengdu University of Traditional Chinese Medicine

Chunxiang Xu

South China Agricultural University

Cooperative Institutions

Fudan University

Chinese Academy of Sciences

Shanghai Institute of Technical Physics

University of Chinese Academy of Sciences

Peking University

Shanghai University

Central South University

University of Electronic Science and Technology of China

Nanjing University

Institute of Physics

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Site-Pairing of Electron in Doped C ₆₀

Chinese Physics Letters (1995)

Guoping Zhang FU RONG-TANG Xin Sun Yasushi Takahashi

Going beyond both a simple perturbative theory and Hartree-Fock treatment, the Gutzwiller variational scheme is employed to clarify the possibility of electron site-pairing in doped C60. It is shown that this pairing can be induced by electron-phonon interaction rather than electron-electron interaction. Our results are supported by EPR experiments.

Electron pair

10.1088/0256-307x/12/8/002

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Citations (1)

ELECTRON CORRELATION EFFECT ON C60 EXCITON POLARON

Acta Physica Sinica (1994)

HUANG QING-PENG FU RONG-TANG Xin Sun FU ROU-LI

Exciton polaron states in C60 molecular are theoretically studied in the tight-binding approach supplemented by the extended Hubbard interaction. The binding energies of the lowest singlet and triplet excitons depend sensitively upon the electron correlation. Then the exciton polaron is formed due to the electron-lattice coupling. Relevent experiments in photo-luminescence spectrum of Cso can be explained qualitatively by the present model with moderate interaction strength Ｕ～５．０ｅＶ，Ｖ～２．０ｅＶ.

Electronic correlation

Lattice (music)

10.7498/aps.43.1833

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Citations (2)

Effects of electric field on the electronic structures in electroluminescent polymers

Journal of Material Science and Technology (2009)

Rouli Fu Junhao Chu FU RONG-TANG Lei Li Xin Sun

Electronic materials

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ELECTRON ELECTRON INTERACTION AND SOLITON EXCITATION(Ⅰ)——THE EFFECT OF ELECTRON CORRELATION ON THE LOCALIZATION OF SOLITON

Acta Physica Sinica (1997)

Yun‐Sheng Ma Chang-Qin Wu Xin Sun FU RONG-TANG FU ROU-LI

The effect of electron-electron interaction on the localization of soliton is studied. Because the conducting polymer possesses wide bandwidth, the Hubbard model is no longer a suitable approximation. It is needed to use a screened Coulomb potential to describe the e-e interaction. Our theory shows that the screening plays a key role in the effect of e-e interaction on the localization of soliton: in weak screening, the localization of soliton will be enhanced by the e-e interaction; in strong screening, it will be reduced. In the end, the physical reason of above-mentioned results is explained by analysing the relation between screening and electron correlation.

Electronic correlation

10.7498/aps.46.353

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Determination of Electronic States in Organic Ferromagnet

Journal of Material Science and Technology (2009)

Xiaodong Wang FU RONG-TANG Xiaohua Xu Xin Sun

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Superlensing effect in liquid surface waves

Physical Review E (2004)

Xinhua Hu Yifeng Shen Xiaohan Liu FU RONG-TANG Jian Zi

We present experimental observations and numerical simulations of superlensing effect in liquid surface waves. We use rigid cylinders to create a two-dimensional periodic lattice, in which liquid surface waves propagate. Through the observation of a superlensing effect, we demonstrate the existence of negative refraction in surface waves. In addition, a complete band gap is found.

Free surface

10.1103/physreve.69.030201

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Citations (139)

Bond structure and electron states of charged C ₆₀

Acta Physica Sinica (Overseas Edition) (1993)

FU ROU-LI Hongjuan Ye FU RONG-TANG Chen Zhang Xin Sun

In the alkali-metal doped C60, the charge transfer induces the distortion of the bond structure and forms the self-trapping electronic bound states. Our theory manifests: 1, the charge transfer reduces the symmetry of C60 from Ih to D5d. 2, Both the bond distortion and the self-trapping states possess layer structures and are localized in the equatorial area. 3, The carbon atoms in charged C60 are divided into eight layers with an inversion center, then there exist four nonequivalent groups of carbon atoms. It makes the NMR line split into a fine structure with strength ratio 1: 1: 2: 2. 4, The charged C60 has two self-trapping bound states, one is 0.06 eV above HOMO with odd parity and the other is 0.05 eV below LUMO with even parity.

10.1088/1004-423x/2/7/007

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PHASE TRANSITION AND NESTING IN LOW DIMENSION

Acta Physica Sinica (1997)

Ling Fan Xiaobing Chen FU RONG-TANG Xin Sun Yoshiyuki Kawazoe

The nesting of the Fermi surface in a two-dimensional (2D) system is not perfect, which is distinctly different from one-dimensional system. The nesting deviation can heavily suppress the instability of 2D system. In this paper, the effect of the nesting deviation on the Peierls transition is quantitatively studied, and the limit for the nesting deviation, beyond which the Peierls transition is destroyed, is determined. Such a behavior is favorable to get the superconductivity.

Nesting (process)

10.7498/aps.46.1972

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ELECTRON-PHONON INTERACTION AND NONLINEAR OPTICAL SUSCEPTIBILITY OF POLYMER

Acta Physica Sinica (1993)

FU RONG-TANG Lie-Ming Li Xin Sun FU ROU-LI

The third harmonic generation spectrum (THG) of trans-polyacetylene exhibits two peaks at 0.6eV and 0.9 eV respectively. None of the existing theories can give a quantitatively satis-factory interpretation. By considering properly the excitation-dependent damping, we can get the second peak at 0.9eV. The damping of excited states that we depict in this paper due to electron-phonon interaction of polymer varies with the excited states. According to this dam-ping, the theoretical results of THG agree with the observed spectrum very well.

Polyacetylene

10.7498/aps.42.422

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Absorption in one-dimensional metallic–dielectric photonic crystals

Journal of Physics Condensed Matter (2004)

Junfei Yu Yifeng Shen Xiaohan Liu FU RONG-TANG Jian Zi

We show theoretically that the absorption of one-dimensional metallic–dielectric photonic crystals can be enhanced considerably over the corresponding constituent metal. By properly choosing the structural and material parameters, the absorption of one-dimensional metallic–dielectric photonic crystals can be enhanced by one order of magnitude in the visible and in the near infrared regions. It is found that the absorptance of such photonic crystals increases with increasing number of periods. Rules on how to obtain a absorption enhancement in a certain frequency range are discussed.

Absorptance

10.1088/0953-8984/16/7/l01

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Citations (47)