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Influence of spin structures and nesting on Fermi surface and a pseudogap anisotropy in tt
Influence of spin structures and nesting on Fermi surface and a pseudogap
anisotropy in t-t’-U Hubbard model.
3
0
0 A.A.Ovchinnikov and M.Ya.Ovchinnikova.
2
y
a Institute of Chemical Physics, RAS, Moscow, 119977, Kosygin str., 4.
M
9
2
]
l
e
-
r
t Abstract
s
.
t Influence of two types of spin structures on the form of the Fermi surface (FS)
a
m and a photoemission intensity map is studied for t − t′ − U Hubbard model. Mean
-
d field calculations are done for the stripe phase and for the spiral spin structure. It
n
o is shown, that unlike a case of electron doping, the hole-doped models are unstable
c
[ with respect to formation of such structures. The pseudogap anisotropies are dif-
1 ferent for h− and e− doping. In accordance with ARPES data for La Sr CuO
2−x x 4
v
5 the stripe phases are characterized by quasi-one-dimensional segments of FS in the
8
6 vicinity of points M (±π, 0) and by suppression of spectral weight in diagonal direc-
5
tion k = k . It is shown that spiral structures display the polarisation anisotropy:
0 x y
3 different segments of FS correspond to electrons with different spin polarisation.
0
/
t
a PACS: 71.10.Fd, 74.20.Rp, 74.20.-z
m
- The angular resolved photoemission spectroscopy (ARPES) is effective in the study of
d
n elect
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