Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations
Dynamics of photoinduced phase transitions in molecular conductors are reviewed from the perspective of interplay between correlated electrons and phonons. (1) The charge-transfer complex TTF-CA shows a transition from a neutral paraelectric phase to an ionic ferroelectric phase. Lattice phonons pro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2012-01-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/2/1/56 |
| _version_ | 1798039642359988224 |
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| author | Kenji Yonemitsu |
| author_facet | Kenji Yonemitsu |
| author_sort | Kenji Yonemitsu |
| collection | DOAJ |
| description | Dynamics of photoinduced phase transitions in molecular conductors are reviewed from the perspective of interplay between correlated electrons and phonons. (1) The charge-transfer complex TTF-CA shows a transition from a neutral paraelectric phase to an ionic ferroelectric phase. Lattice phonons promote this photoinduced transition by preparing short-range lattice dimerization as a precursor. Molecular vibrations stabilize the neutral phase so that the ionic phase, when realized, possesses a large ionicity and the Mott character; (2) The organic salts θ-(BEDT-TTF)2RbZn(SCN)4 and α-(BEDT-TTF)2I3 show transitions from a charge-ordered insulator to a metal. Lattice phonons make this photoinduced transition hard for the former salt only. Molecular vibrations interfere with intermolecular transfers of correlated electrons at an early stage; (3) The organic salt κ-(d-BEDT-TTF)2Cu[N(CN)2]Br shows a transition from a Mott insulator to a metal. Lattice phonons modulating intradimer transfer integrals enable photoexcitation-energy-dependent transition pathways through weakening of effective interaction and through introduction of carriers. |
| first_indexed | 2024-04-11T21:56:42Z |
| format | Article |
| id | doaj.art-5945d2d7560044348831a227c7aa97ee |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-11T21:56:42Z |
| publishDate | 2012-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-5945d2d7560044348831a227c7aa97ee2022-12-22T04:01:05ZengMDPI AGCrystals2073-43522012-01-0121567710.3390/cryst2010056Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular VibrationsKenji YonemitsuDynamics of photoinduced phase transitions in molecular conductors are reviewed from the perspective of interplay between correlated electrons and phonons. (1) The charge-transfer complex TTF-CA shows a transition from a neutral paraelectric phase to an ionic ferroelectric phase. Lattice phonons promote this photoinduced transition by preparing short-range lattice dimerization as a precursor. Molecular vibrations stabilize the neutral phase so that the ionic phase, when realized, possesses a large ionicity and the Mott character; (2) The organic salts θ-(BEDT-TTF)2RbZn(SCN)4 and α-(BEDT-TTF)2I3 show transitions from a charge-ordered insulator to a metal. Lattice phonons make this photoinduced transition hard for the former salt only. Molecular vibrations interfere with intermolecular transfers of correlated electrons at an early stage; (3) The organic salt κ-(d-BEDT-TTF)2Cu[N(CN)2]Br shows a transition from a Mott insulator to a metal. Lattice phonons modulating intradimer transfer integrals enable photoexcitation-energy-dependent transition pathways through weakening of effective interaction and through introduction of carriers.http://www.mdpi.com/2073-4352/2/1/56photoinduced phase transitionneutral-ionic transitioncharge-order meltingmetal-insulator transition |
| spellingShingle | Kenji Yonemitsu Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations Crystals photoinduced phase transition neutral-ionic transition charge-order melting metal-insulator transition |
| title | Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations |
| title_full | Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations |
| title_fullStr | Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations |
| title_full_unstemmed | Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations |
| title_short | Theory of Photoinduced Phase Transitions in Molecular Conductors: Interplay Between Correlated Electrons, Lattice Phonons and Molecular Vibrations |
| title_sort | theory of photoinduced phase transitions in molecular conductors interplay between correlated electrons lattice phonons and molecular vibrations |
| topic | photoinduced phase transition neutral-ionic transition charge-order melting metal-insulator transition |
| url | http://www.mdpi.com/2073-4352/2/1/56 |
| work_keys_str_mv | AT kenjiyonemitsu theoryofphotoinducedphasetransitionsinmolecularconductorsinterplaybetweencorrelatedelectronslatticephononsandmolecularvibrations |