Revealing possible long-living coherence in ultrafast processes allows detecting genuine quantum mechanical effects in molecules. To investigate such effects from a quantum chemistry perspective, we have developed a method for simulating the time evolution of molecular systems based on ab initio calculations, which includes relaxation and environment-induced dephasing of the molecular wave function whose rates are external parameters. The proposed approach combines a quantum chemistry description of the molecular target with a real-time propagation scheme within the time-dependent stochastic Schrödinger equation. Moreover, it allows a quantitative characterization of the state and dynamics coherence through the l1-norm of coherence and the linear entropy, respectively. To test the approach, we have simulated femtosecond pulse-shaping ultrafast spectroscopy of terrylenediimide, a well-studied fluorophore in single-molecule spectroscopy. Our approach is able to reproduce the experimental findings [R. Hildner et al., Nat. Phys. 7, 172 (2011)], confirming the usefulness of the approach and the correctness of the implementation.
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28 May 2018
Research Article|
May 30 2018
Probing quantum coherence in ultrafast molecular processes: An ab initio approach to open quantum systems Available to Purchase
Emanuele Coccia
;
Emanuele Coccia
a)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
2
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
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Filippo Troiani;
Filippo Troiani
2
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
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Stefano Corni
Stefano Corni
a)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
2
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
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Emanuele Coccia
1,2,a)
Filippo Troiani
2
Stefano Corni
1,2,a)
1
Department of Chemical Sciences, University of Padova
, via Marzolo 1, Padova, Italy
2
CNR Institute of Nanoscience
, via Campi 213/A, Modena, Italy
J. Chem. Phys. 148, 204112 (2018)
Article history
Received:
January 19 2018
Accepted:
May 11 2018
Citation
Emanuele Coccia, Filippo Troiani, Stefano Corni; Probing quantum coherence in ultrafast molecular processes: An ab initio approach to open quantum systems. J. Chem. Phys. 28 May 2018; 148 (20): 204112. https://doi.org/10.1063/1.5022976
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