ABSTRACT
In the previous chapter, we introduce the Green’s function method
for treating many-electron systems. To obtain the transport prop-
erties of nanometer-scale materials, we need to obtain electronic
states, taking the realistic atomic crystal structures into account.
The complete solutions to the Schro¨dinger equation for many-
electron systems are impossible to obtain, even if we use the
fastest supercomputers for the calculations. Therefore, a number of
practical computation methods have been proposed with various
approximations to solve the Schro¨dinger equation for electronic
structures of many-electron systems.
