Abstract
We show that the quasiclassical Green function for Fermi liquids can be constructed from the solutions of the Bogoliubov-de Gennes equation within the Andreev approximation and derive self-consistent relations to be satisfied by the quasiclassical Green function at the surfaces. The so called normalization condition for the quasiclassical Green function is obtained from this self-consistent relation. Our boundary condition for the randomly rippled wall is different from that previously derived by Buchholtz and Rainer and by Buchholtz.
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