Pressure-dependent relaxation in the photoexcited mott insulator ET-F2TCNQ: influence of hopping and correlations on quasiparticle recombination rates.
We measure the ultrafast recombination of photoexcited quasiparticles (holon-doublon pairs) in the one dimensional Mott insulator ET-F(2)TCNQ as a function of external pressure, which is used to tune the electronic structure. At each pressure value, we first fit the static optical properties and extract the electronic bandwidth t and the intersite correlation energy V. We then measure the recombination times as a function of pressure, and we correlate them with the corresponding microscopic parameters. We find that the recombination times scale differently than for metals and semiconductors. A fit to our data based on the time-dependent extended Hubbard Hamiltonian suggests that the competition between local recombination and delocalization of the Mott-Hubbard exciton dictates the efficiency of the recombination.
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
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M
Mitrano
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany and Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.
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G
Cotugno
Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom and Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
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SR
Clark
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
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R
Singla
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
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S
Kaiser
Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany.
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J
Stähler
1. Physikalisches Insitut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
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R
Beyer
1. Physikalisches Insitut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
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Dressel
Center for Life NanoScience@Sapienza, Istituto Italiano di Tecnologia, V.le Regina Elena 291, 00185 Rome, Italy.
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L
Baldassarre
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
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D
Nicoletti
INSTM UdR Trieste-ST and Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34012 Basovizza, Trieste Italy.
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A
Perucchi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
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T
Hasegawa
Department of Advanced Material Science, University of Tokyo, Chiba 277-8561, Japan.
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H
Okamoto
Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom and Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
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D
Jaksch
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany and Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.
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Cavalleri
D016576:Fleroxacin / Q000031:analogs & derivatives / Q000737:chemistry; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008956:Models, Chemical; D009570:Nitriles / Q000737:chemistry*; D055095:Optics and Photonics; D011312:Pressure
D006571:Heterocyclic Compounds; D009570:Nitriles; C569644:tri-p-quinodimethane; C063887:tetrathiafulvalene; D016576:Fleroxacin