The expression of the ground-state energy of the electron coupled simultaneously with a Coulomb potential and a longitudinal-optical phonon field in parabolic quantum dots and wires is derived within the framework of ...The expression of the ground-state energy of the electron coupled simultaneously with a Coulomb potential and a longitudinal-optical phonon field in parabolic quantum dots and wires is derived within the framework of Feynman variational path integral theory.We obtain a general result with arbitrary electron-phonon coupling constant,Coulomb binding parameters,and confining potential strength,which could be used for further numerical calculation of polaron properties.Moreover,it is shown that all the previous path-integral formulae for free polarons,bound polarons,and polarons confined in parabolic quantum dots and wires can be recovered in the present formalism.展开更多
Amorphous FexCul-x thin films with x ranging from 0.21 to 0.81 have been obtained by rf-magnetron sputtering.The structure and the electric transport properties of the films can be controlled by both the composition a...Amorphous FexCul-x thin films with x ranging from 0.21 to 0.81 have been obtained by rf-magnetron sputtering.The structure and the electric transport properties of the films can be controlled by both the composition and annealing temperature.The resistances of the films decrease with the temperature increasing from 12 to 300K,which is the typical semiconductor characteristic.After annealing at 400°C for 5h,the amorphous FexCul-x thin film is crystallized and exhibits electric transport property an normal metal film.The dependence of resistance-temperature characteristics of the films on the composition and deposition time is described.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19804009.
文摘The expression of the ground-state energy of the electron coupled simultaneously with a Coulomb potential and a longitudinal-optical phonon field in parabolic quantum dots and wires is derived within the framework of Feynman variational path integral theory.We obtain a general result with arbitrary electron-phonon coupling constant,Coulomb binding parameters,and confining potential strength,which could be used for further numerical calculation of polaron properties.Moreover,it is shown that all the previous path-integral formulae for free polarons,bound polarons,and polarons confined in parabolic quantum dots and wires can be recovered in the present formalism.
基金Supported by the National Natural Science Foundation of China under Grant No.19504003the Special Foundation for Ph.D.Education of State Ministry of Education of China under Grant No.9533529.
文摘Amorphous FexCul-x thin films with x ranging from 0.21 to 0.81 have been obtained by rf-magnetron sputtering.The structure and the electric transport properties of the films can be controlled by both the composition and annealing temperature.The resistances of the films decrease with the temperature increasing from 12 to 300K,which is the typical semiconductor characteristic.After annealing at 400°C for 5h,the amorphous FexCul-x thin film is crystallized and exhibits electric transport property an normal metal film.The dependence of resistance-temperature characteristics of the films on the composition and deposition time is described.
