Volume 69, Number 3, February 2005
|Page(s)||397 - 403|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||12 January 2005|
Fragmentation of band and Fermi surface in stripe phase
Institute of Chemical Physics, RAS - Moscow, 119977, Kosygin str., 4, Russia
Accepted: 18 November 2004
The mean-field study of the stripe phases of the t-t'-U Hubbard model confirms the formation of the in-gap subbands of states localized on the domain walls. For bond-aligned stripes it is shown that segments of Fermi surfaces in antinodal and nodal directions correspond to the in-gap band or to that delocalized over a whole antiferromagnet domain. This can explain the dichotomy between the corresponding quasiparticles in x4 (LSCO) and the suppression of spectral weight in the nodal direction in underdoped LSCO. The Fermi surface changes its topology with doping. It is confirmed also that diagonal stripes can provide an insulating state at nonzero doping.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.20.Rp – Pairing symmetries (other than s-wave) / 74.20.-z – Theories and models of superconducting state
© EDP Sciences, 2005
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