Excitonic Insulator State of the Extended Falicov–Kimball Model in the Cluster Dynamical Impurity Approximation
We comparatively study the excitonic insulator state in the extended Falicov-Kimball model (EFKM, a spinless two-band model) on the two-dimensional square lattice using the variational cluster approximation (VCA) and the cluster dynamical impurity approximation (CDIA). In the latter, the particle-ba...
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| Veröffentlicht in: | Journal of the Physical Society of Japan 2017-07, Vol.86 (7), p.74709 |
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| container_title | Journal of the Physical Society of Japan |
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| creator | Hamada, Kosuke Kaneko, Tatsuya Miyakoshi, Shohei Ohta, Yukinori |
| description | We comparatively study the excitonic insulator state in the extended Falicov-Kimball model (EFKM, a spinless two-band model) on the two-dimensional square lattice using the variational cluster approximation (VCA) and the cluster dynamical impurity approximation (CDIA). In the latter, the particle-bath sites are included in the reference cluster to take into account the particle-number fluctuations in the correlation sites. We thus calculate the particle-number distribution, order parameter, ground-state phase diagram, anomalous Green's function, and pair coherence length, thereby demonstrating the usefulness of the CDIA in the discussion of the excitonic condensation in the EFKM. |
| doi_str_mv | 10.7566/JPSJ.86.074709 |
| format | Article |
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In the latter, the particle-bath sites are included in the reference cluster to take into account the particle-number fluctuations in the correlation sites. We thus calculate the particle-number distribution, order parameter, ground-state phase diagram, anomalous Green's function, and pair coherence length, thereby demonstrating the usefulness of the CDIA in the discussion of the excitonic condensation in the EFKM.</description><identifier>ISSN: 0031-9015</identifier><identifier>EISSN: 1347-4073</identifier><identifier>DOI: 10.7566/JPSJ.86.074709</identifier><language>eng</language><publisher>Tokyo: The Physical Society of Japan</publisher><subject>Approximation ; Clusters ; Coherence length ; Comparative analysis ; Condensation ; Correlation analysis ; Lattice theory ; Mathematical analysis ; Order parameters ; Two dimensional models</subject><ispartof>Journal of the Physical Society of Japan, 2017-07, Vol.86 (7), p.74709</ispartof><rights>Copyright The Physical Society of Japan Jul 15, 2017</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c405t-7bf3a7d567c58c337bce02a3c9a3441e356bf460ef830c924d4e81ff890db1733</citedby><cites>FETCH-LOGICAL-c405t-7bf3a7d567c58c337bce02a3c9a3441e356bf460ef830c924d4e81ff890db1733</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Hamada, Kosuke</creatorcontrib><creatorcontrib>Kaneko, Tatsuya</creatorcontrib><creatorcontrib>Miyakoshi, Shohei</creatorcontrib><creatorcontrib>Ohta, Yukinori</creatorcontrib><title>Excitonic Insulator State of the Extended Falicov–Kimball Model in the Cluster Dynamical Impurity Approximation</title><title>Journal of the Physical Society of Japan</title><description>We comparatively study the excitonic insulator state in the extended Falicov-Kimball model (EFKM, a spinless two-band model) on the two-dimensional square lattice using the variational cluster approximation (VCA) and the cluster dynamical impurity approximation (CDIA). In the latter, the particle-bath sites are included in the reference cluster to take into account the particle-number fluctuations in the correlation sites. 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In the latter, the particle-bath sites are included in the reference cluster to take into account the particle-number fluctuations in the correlation sites. We thus calculate the particle-number distribution, order parameter, ground-state phase diagram, anomalous Green's function, and pair coherence length, thereby demonstrating the usefulness of the CDIA in the discussion of the excitonic condensation in the EFKM.</abstract><cop>Tokyo</cop><pub>The Physical Society of Japan</pub><doi>10.7566/JPSJ.86.074709</doi></addata></record> |
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| language | eng |
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| source | Alma/SFX Local Collection |
| subjects | Approximation Clusters Coherence length Comparative analysis Condensation Correlation analysis Lattice theory Mathematical analysis Order parameters Two dimensional models |
| title | Excitonic Insulator State of the Extended Falicov–Kimball Model in the Cluster Dynamical Impurity Approximation |
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