Is there someone can tell me some papers or books about the basic material of Spectral flow? I want to know, what is spectral flow and how to use it to geometry.
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A good start could be to read this paper by Philips which was recommended to me, when I was looking for an overview: 


A discussion of the spectral flow not only in the context of pure supersymmetric conformal field theory, but also in the context of their associated geometries, can be found in a recent book by Ralph Blumenhagen and Erik Plauschinn, "Introduction to conformal field theory, with applications to string theory", Lecture Notes in Physics 779, Springer Verlag, 2009. In this reference the spectral flow is also discussed in the context of Gepner models, exactly solvable conformal field theories that describe the underlying field theory of certain types of CalabiYau varieties. This provides a link between CFTs and CYs. 

