Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$
Utilizing the unbiased time-dependent density-matrix renormalization group technique, we examine the photoemission spectra in the extended Falicov-Kimball model at zero and finite temperatures, particularly with regard to the excitonic insulator state most likely observed in the quasi-one-dimensi...
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| Format: | Article |
| Language: | English |
| Published: |
SciPost
2021-03-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.10.3.077 |
| _version_ | 1818327114846306304 |
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| author | Satoshi Ejima, Florian Lange, Holger Fehske |
| author_facet | Satoshi Ejima, Florian Lange, Holger Fehske |
| author_sort | Satoshi Ejima, Florian Lange, Holger Fehske |
| collection | DOAJ |
| description | Utilizing the unbiased time-dependent density-matrix renormalization group
technique, we examine the photoemission spectra in the extended Falicov-Kimball
model at zero and finite temperatures, particularly with regard to the
excitonic insulator state most likely observed in the quasi-one-dimensional
material Ta$_2$NiSe$_5$. Working with infinite boundary conditions, we are able
to simulate all dynamical correlation functions directly in the thermodynamic
limit. For model parameters best suited for Ta$_2$NiSe$_5$ the photoemission
spectra show a weak but clearly visible two-peak structure, around the Fermi
momenta $k\simeq\pm k_{\rm F}$, which suggests that Ta$_2$NiSe$_5$ develops an
excitonic insulator of BCS-like type. At higher temperatures, the leakage of
the conduction-electron band beyond the Fermi energy becomes distinct, which
provides a possible explanation for the bare non-interacting band structure
seen in time- and angle-resolved photoemission spectroscopy experiments. |
| first_indexed | 2024-12-13T12:11:08Z |
| format | Article |
| id | doaj.art-073cf2747aff4b178e201458ecd6d825 |
| institution | Directory Open Access Journal |
| issn | 2542-4653 |
| language | English |
| last_indexed | 2024-12-13T12:11:08Z |
| publishDate | 2021-03-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj.art-073cf2747aff4b178e201458ecd6d8252022-12-21T23:46:50ZengSciPostSciPost Physics2542-46532021-03-0110307710.21468/SciPostPhys.10.3.077Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$Satoshi Ejima, Florian Lange, Holger FehskeUtilizing the unbiased time-dependent density-matrix renormalization group technique, we examine the photoemission spectra in the extended Falicov-Kimball model at zero and finite temperatures, particularly with regard to the excitonic insulator state most likely observed in the quasi-one-dimensional material Ta$_2$NiSe$_5$. Working with infinite boundary conditions, we are able to simulate all dynamical correlation functions directly in the thermodynamic limit. For model parameters best suited for Ta$_2$NiSe$_5$ the photoemission spectra show a weak but clearly visible two-peak structure, around the Fermi momenta $k\simeq\pm k_{\rm F}$, which suggests that Ta$_2$NiSe$_5$ develops an excitonic insulator of BCS-like type. At higher temperatures, the leakage of the conduction-electron band beyond the Fermi energy becomes distinct, which provides a possible explanation for the bare non-interacting band structure seen in time- and angle-resolved photoemission spectroscopy experiments.https://scipost.org/SciPostPhys.10.3.077 |
| spellingShingle | Satoshi Ejima, Florian Lange, Holger Fehske Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ SciPost Physics |
| title | Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ |
| title_full | Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ |
| title_fullStr | Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ |
| title_full_unstemmed | Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ |
| title_short | Finite-temperature photoemission in the extended Falicov-Kimball model: a case study for Ta$_2$NiSe$_5$ |
| title_sort | finite temperature photoemission in the extended falicov kimball model a case study for ta 2 nise 5 |
| url | https://scipost.org/SciPostPhys.10.3.077 |
| work_keys_str_mv | AT satoshiejimaflorianlangeholgerfehske finitetemperaturephotoemissionintheextendedfalicovkimballmodelacasestudyforta2nise5 |