A global non-analytical fit method for the complex lineshape analysis of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$

摘要

The implementation of global non-analytical fit is exemplified by itsapplication to the spectral analysis of the complex lineshape ofBi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ at $(\pi,0)$. It deals with properly amulti-level globality in the fitting parameters and efficiently thenon-analytical evaluation of the fitting function, thus exhibiting a potentialapplicability to a wide range of systematic analysis task.