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Strong coupling Hartree-Fock approximation in the dynamical mean-field theory
In the limit of infinite spatial dimensions, a thermodynamically consistent theory, which is valid for arbitrary value of the Coulombic interaction ( U < ∞ ), is built for the Hubbard model when the total auxiliary single-site problem exactly splits into four subspaces with different “vacuum s...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2001
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/119753 |
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| Summary: | In the limit of infinite spatial dimensions, a thermodynamically consistent
theory, which is valid for arbitrary value of the Coulombic interaction ( U <
∞ ), is built for the Hubbard model when the total auxiliary single-site problem
exactly splits into four subspaces with different “vacuum states”. Some
analytical results are given for the Hartree-Fock approximation when the 4-
pole structure for Green’s function is obtained: two poles describe contribution
from the Fermi liquid component, which is ferromagnetic and dominant
for small electron and hole concentrations (“overdoped case” of high- Tc ’s),
whereas other two describe contribution from the non-Fermi liquid, which
is antiferromagnetic and dominant close to half filling (“underdoped case”). |
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