GREENS-FUNCTION THEORY OF FREE-ELECTRONS IN THIN-FILMS

The electronic subsystem of ultrathin films vias analysed using Green' s function method including quantum size effect and the effect of boun daries to Hamiltonian parameters. Diagonal components of Green's funct ions were evaluated which enabled a complete insight into the thermody namical properties of electrons. A comparison with crystal bulk has sh own that electronic properties of the materials are strongly influence d both by the sample dimensions and boundary conditions. The numerical calculations show that the electron distribution may be manipulated b y varying the surface parameters which is significant for the operatio n of devices based on thin films.