Feng Wei-Guo

Variational study on missing bond-charge repulsion on the extended Hubbard model: effects on polyacetylene

The variational approach is applied to the study on the effect of Coulomb interaction between electrons on the dimerization in a one-dimensional commensurability-two Peierls system, such as trans-polyacetylene. For the case of omitting direct repulsion between electrons in the bonds between sites W, it is confirmed that the weak interactions tend to enhance the dimerization; but when W is included, this enhancement will be attenuated. If |W| is sufficiently large, the net effect of electron-electron interactions will reduce the magnitude of the electron-phonon-induced dimerization.

A Method of Determining Representation of Quonic Algebra

In this letter, we construct representation of quonic algebra in quite a different method compared with the conventional one.

On q-Commutator in the Case q3+1 = 1

In this letter, the representations of q-Commutator in the Case q3+1 = 1 and the eigenstates of annihilation operator have been discussed.

Plasmons in Finite Three-Tile Quasiperiodic Superlattices: On-Site Model

We investigate the plasmon spectrum of a finite semiconductor superlattice in which the quantum wells are located at periodic sites but the electron densities are arranged in a three-tile quasiperiodic sequence. It is found that the branching rule of the on-site model is different from that of the transfer model. The quasiperiodic arrangement of the electron densities results in a number of surface modes. The localization of the modes is discussed.

Transport Through Fibonacci Coupled Quantum Dots

We have studied the transport properties of a quasi-periodical one-dimensional system. This system consists of a sequence of Fibonacci coupled quantum dots. Using the transfer-matrix method, and taking account of the experimental technique, we have proposed the formalism of the electron transmission rate for the chain of quantum dots. From the numerical results, we found that the transmission spectra of the system have a rich structure, which just depends on the coupling between quantum dots.

Electron correlation and many-body wave function of semiconductor heterojunction

Based on the Correlated-Basis-Functions (CBF) theory, we have obtained the many-body wave function for the quasi-two-dimensional electron system in AlxGa1-xAs-GaAs heterojunction. The pair-correlation functions g(R) were calculated, and a new method for the calculation of correlation energy was also presented.