احمد محمدی اسلامی

In this work, we rst use the nite-dierential time-domain (FDTD) to calculate the eigenenergies and eigenfunctions of a three dimensional (3D) cylindrical quantum wire. We assume that the inside of the wire is at zero potential. But, the outside of the wire has been chosen at dierent potentials as innite and nite values. This is a true 3D procedure based on a direct implementation of the time-dependent Schrodinger equation. Then, we apply the Shannon and Tsallis entropy to obtain entropy and specic of the system. The results show that (i) the specic heat obtained by Tsallis has a peak structure. (ii) The entropy behavior for the nite and innite conning potential has the same behavior at low temperatures. (iii) The peak value of specific heat increases with enhancing the quantum wire radius.