Abstract
The Fermi surface (FS) of La 2− x Sr x CuO 4 (LSCO) is investigated in the Hubbard model by means of a first-order cumulant expansion. Despite the crudeness of our approximation, two important features of the real systems are described well. First, the doping dependence of the shape of the FS as observed by angle-resolved photoemission spectroscopy (ARPES) experiments on LSCO is obtained. Second, a possible interpretation of the sudden disappearance of the FS in the highly underdoped region is given. It is also shown as to how to reconcile the Luttinger's theorem (LT), that seems to be true in the overdoped region, with the behaviour of the highly underdoped region which is evidently non-Fermi Liquid (FL) like. Thus, we are able to explain why small doping can produce large FS.
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