Pseudogaps: introducing the length scale into dynamical mean-field theory
Pseudogap physics in strongly correlated systems is essentially scale dependent. We generalize the dynamical mean-field theory (DMFT) by introducing into the DMFT equations dependence on the correlation length of pseudogap fluctuations via an additional (momentum-dependent) self-energy ∑k. Thi...
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| Date: | 2006 |
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| Language: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Series: | Физика низких температур |
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| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/120182 |
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| Cite this: | Pseudogaps: introducing the length scale into dynamical mean-field theory / E.Z. Kuchinskii, I.A. Nekrasov, V.M. Sadovskii // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 528–537. — Бібліогр.: 23 назв. — англ. |
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irk-123456789-1201822017-06-12T03:04:30Z Pseudogaps: introducing the length scale into dynamical mean-field theory Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. Pseudogap Pseudogap physics in strongly correlated systems is essentially scale dependent. We generalize the dynamical mean-field theory (DMFT) by introducing into the DMFT equations dependence on the correlation length of pseudogap fluctuations via an additional (momentum-dependent) self-energy ∑k. This self-energy describes nonlocal dynamical correlations induced by short-ranged collective SDW-like antiferromagnetic spin (or CDW-like charge) fluctuations. At high enough temperatures these fluctuations can be viewed as a quenched Gaussian random field with finite correlation length. This generalized DMFT + ∑k approach is used for the numerical solution of the weakly doped one-band Hubbard model with repulsive Coulomb interaction on a square lattice with nearest and next nearest neighbor hopping. The effective single impurity problem is solved by the numerical renormalization group (NRG). Both types of strongly correlated metals, namely (i) the doped Mott insulator and (ii) the case of bandwidth W ≲ U (U is the value of local Coulomb interaction) are considered. Densities of states, spectral functions and ARPES spectra calculated within DMFT + ∑k show a pseudogap formation near the Fermi level of the quasiparticle band. We also briefly discuss effects of random impurity scattering. Finally we demonstrate the qualitative picture of Fermi surface «destruction» due to pseudogap fluctuations and formation of «Fermi arcs» which agrees well with ARPES observations. 2006 Article Pseudogaps: introducing the length scale into dynamical mean-field theory / E.Z. Kuchinskii, I.A. Nekrasov, V.M. Sadovskii // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 528–537. — Бібліогр.: 23 назв. — англ. 0132-6414 PACS: 71.10.Fd, 71.10.Hf, 71.27.+a, 71.30.+h, 74.72.–h http://dspace.nbuv.gov.ua/handle/123456789/120182 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Pseudogap Pseudogap |
| spellingShingle |
Pseudogap Pseudogap Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. Pseudogaps: introducing the length scale into dynamical mean-field theory Физика низких температур |
| description |
Pseudogap physics in strongly correlated systems is essentially scale dependent. We generalize
the dynamical mean-field theory (DMFT) by introducing into the DMFT equations dependence on
the correlation length of pseudogap fluctuations via an additional (momentum-dependent) self-energy
∑k. This self-energy describes nonlocal dynamical correlations induced by short-ranged collective
SDW-like antiferromagnetic spin (or CDW-like charge) fluctuations. At high enough temperatures
these fluctuations can be viewed as a quenched Gaussian random field with finite
correlation length. This generalized DMFT + ∑k approach is used for the numerical solution of the
weakly doped one-band Hubbard model with repulsive Coulomb interaction on a square lattice
with nearest and next nearest neighbor hopping. The effective single impurity problem is solved by
the numerical renormalization group (NRG). Both types of strongly correlated metals, namely (i)
the doped Mott insulator and (ii) the case of bandwidth W ≲ U (U is the value of local Coulomb
interaction) are considered. Densities of states, spectral functions and ARPES spectra calculated
within DMFT + ∑k show a pseudogap formation near the Fermi level of the quasiparticle band. We
also briefly discuss effects of random impurity scattering. Finally we demonstrate the qualitative
picture of Fermi surface «destruction» due to pseudogap fluctuations and formation of «Fermi
arcs» which agrees well with ARPES observations. |
| format |
Article |
| author |
Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. |
| author_facet |
Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. |
| author_sort |
Kuchinskii, E.Z. |
| title |
Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_short |
Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_full |
Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_fullStr |
Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_full_unstemmed |
Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_sort |
pseudogaps: introducing the length scale into dynamical mean-field theory |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2006 |
| topic_facet |
Pseudogap |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/120182 |
| citation_txt |
Pseudogaps: introducing the length scale into
dynamical mean-field theory / E.Z. Kuchinskii, I.A. Nekrasov, V.M. Sadovskii // Физика низких температур. — 2006. — Т. 32, № 4-5. — С. 528–537. — Бібліогр.: 23 назв. — англ. |
| series |
Физика низких температур |
| work_keys_str_mv |
AT kuchinskiiez pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory AT nekrasovia pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory AT sadovskiivm pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory |
| first_indexed |
2025-07-08T17:24:01Z |
| last_indexed |
2025-07-08T17:24:01Z |
| _version_ |
1837100371901677568 |