Electron momentum distribution in underdoped cuprates

Details Electron momentum distribution in underdoped cuprates Electron momentum distribution in underdoped cuprates

2000-01-21

arxiv.org/abs/cond-mat/0001316v1

Phys. Rev. B 61, 4389 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, submitted to PRB

Scientific paper

10.1103/PhysRevB.61.4389

We investigate the electron momentum distribution function (EMD) in a weakly doped two-dimensional quantum antiferromagnet (AFM) as described by the t-J model. Our analytical results for a single hole in an AFM based on the self-consistent Born approximation (SCBA) indicate an anomalous momentum dependence of EMD showing 'hole pockets' coexisting with a signature of an emerging large Fermi surface. The position of the incipient Fermi surface and the structure of the EMD is determined by the momentum of the ground state. Our analysis shows that this result remains robust in the presence of next-nearest neighbor hopping terms in the model. Exact diagonalization results for small clusters are with the SCBA reproduced quantitatively.

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