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Chen S.-H.,Huzhou Vocational Technology College
Journal of Low Temperature Physics | Year: 2013

Within the framework of the Landau-Pekar variational method we have derived an analytical expression for the ground-state binding energies and the effective mass of an electron bound to a Coulomb impurity in a polar semiconductor quantum dot (QD) with parabolic confinement in both two and three dimensions. We have also calculated the number of phonons in the cloud of this bound polaron. It is found that the effective mass increase with increasing the Coulomb binding parameter and increase with the decrease in size of the QD. The results also indicate that this effect becomes much more pronounced with decreasing dimensionality. © 2012 Springer Science+Business Media, LLC. Source


Chen S.-H.,Huzhou Vocational Technology College
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2011

Cyclotron resonance of magnetopolarons bound to a Coulomb impurity in a two-dimensional (2D) parabolic quantum dot (QD) is studied within a variational calculation for all coupling strengths. The LeeLowPinesHuybrecht variational technique that was developed previously for all coupling strengths has been extended for polarons in a magnetic field. The dependence of the cyclotron resonance masses on the magnetic field, the confinement length, the electronphonon coupling strength and the Coulomb binding parameter is investigated. © 2010 Elsevier B.V. All rights reserved. Source


Chen S.-H.,Huzhou Vocational Technology College
Physica B: Condensed Matter | Year: 2011

A variational approach is employed to obtain the ground and the first excited state binding energies of an electron bound to a hydrogenic impurity in a polar semiconductor quantum dot (QD) with symmetric parabolic confinement in both two and three-dimensions. We perform calculations for the entire range of the electronphonon coupling constant and the Coulomb binding parameter and for arbitrary confinement length. It is found that the binding energy of ground and first excited state is larger in a two-dimension (2D) dot than in a three-dimension (3D) dot and this trend is more pronounced with the increase of the electronphonon coupling constant for the same value of the Coulomb binding parameter and confinement length. Furthermore, the ground and the first excited state binding energy increases with increasing the Coulomb binding parameter in both 2D and 3D QDs for the same electronphonon coupling constant. © 2011 Elsevier B.V. All rights reserved. Source


Lou X.Y.,Huzhou Vocational Technology College
Advanced Materials Research | Year: 2014

Virtual reality modeling language (VRML) system is a new type of human-computer interaction system. It also is the development direction of modern mechanical design. This paper expounds the characteristics of VRML, presents the key technology of VRML from the mechanical product development mode, and it probes into the VRML research direction. © (2014) Trans Tech Publications, Switzerland. Source


Chen S.-H.,Huzhou Vocational Technology College
Physica B: Condensed Matter | Year: 2014

We investigate the influence of magnetic field on the electron charge qubit in a GaAs single-electron semiconductor quantum dot (QD) including electron-LO-phonon interaction. We analytically and numerically evaluate decoherence time by applying the Lee-Low-Pines-Huybrecht (LLPH) variational calculation considering all coupling strengths. At the same time, the time evolution of the electron probability density is obtained, the dependence of decoherence time and the period of oscillation on the magnetic field strength and the size of QD is investigated. The results are expected to play an important role in designing the solid-state implementation of quantum computing. © 2014 Elsevier B.V. Source

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