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-...
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| Опубліковано в: : | Физика низких температур |
|---|---|
| Дата: | 2006 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2006
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/120182 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862655933038985216 |
|---|---|
| author | Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. |
| author_facet | Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. |
| 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. |
| collection | DSpace DC |
| container_title | 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.
|
| first_indexed | 2025-12-02T04:17:12Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-120182 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-02T04:17:12Z |
| publishDate | 2006 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. 2017-06-11T12:00:20Z 2017-06-11T12:00:20Z 2006 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 https://nasplib.isofts.kiev.ua/handle/123456789/120182 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. We are grateful to Th. Pruschke for providing us
 with his NRG code and helpful discussions. This work
 was supported in part by RFBR grants 05-02-16301,
 05-02-17244, and programs of the Presidium of the
 Russian Academy of Sciences (RAS) «Quantum
 macrophysics» and of the Division of Physical Sciences
 of the RAS «Strongly correlated electrons in
 semiconductors, metals, superconductors and magnetic
 materials». I.N. acknowledges support from the
 Dynasty Foundation and International Centre for
 Fundamental Physics in Moscow program for young
 scientists 2005 and Russian Science Support Foundation
 program for young PhD of the Russian Academy
 of Sciences 2005. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Pseudogap Pseudogaps: introducing the length scale into dynamical mean-field theory Article published earlier |
| spellingShingle | Pseudogaps: introducing the length scale into dynamical mean-field theory Kuchinskii, E.Z. Nekrasov, I.A. Sadovskii, V.M. Pseudogap |
| title | 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_short | Pseudogaps: introducing the length scale into dynamical mean-field theory |
| title_sort | pseudogaps: introducing the length scale into dynamical mean-field theory |
| topic | Pseudogap |
| topic_facet | Pseudogap |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/120182 |
| work_keys_str_mv | AT kuchinskiiez pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory AT nekrasovia pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory AT sadovskiivm pseudogapsintroducingthelengthscaleintodynamicalmeanfieldtheory |