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Article

From Symmetry Breaking via Charge Migration to Symmetry Restoration in Electronic Ground and Excited States: Quantum Control on the Attosecond Time Scale

1
Freie Universität Berlin, Institut für Chemie und Biochemie, 14195 Berlin, Germany
2
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
3
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
4
Laboratoire de Physique et Chimie Théoriques, CNRS-Université de Lorraine, UMR 7019, ICPM, 1 Bd Arago, 57070 Metz, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(5), 953; https://doi.org/10.3390/app9050953
Received: 21 January 2019 / Revised: 22 February 2019 / Accepted: 28 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
This article starts with an introductory survey of previous work on breaking and restoring the electronic structure symmetry of atoms and molecules by means of two laser pulses. Accordingly, the first pulse breaks the symmetry of the system in its ground state with irreducible representation I R R E P g by exciting it to a superposition of the ground state and an excited state with different I R R E P e . The superposition state is non-stationary, representing charge migration with period T in the sub- to few femtosecond time domains. The second pulse stops charge migration and restores symmetry by de-exciting the superposition state back to the ground state. Here, we present a new strategy for symmetry restoration: The second laser pulse excites the superposition state to the excited state, which has the same symmetry as the ground state, but different I R R E P e . The success depends on perfect time delay between the laser pulses, with precision of few attoseconds. The new strategy is demonstrated by quantum dynamics simulation for an oriented model system, benzene. View Full-Text
Keywords: attosecond chemistry; laser control; symmetry breaking; symmetry restoration; charge migration; quantum dynamics; benzene attosecond chemistry; laser control; symmetry breaking; symmetry restoration; charge migration; quantum dynamics; benzene
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MDPI and ACS Style

Liu, C.; Manz, J.; Tremblay, J.C. From Symmetry Breaking via Charge Migration to Symmetry Restoration in Electronic Ground and Excited States: Quantum Control on the Attosecond Time Scale. Appl. Sci. 2019, 9, 953. https://doi.org/10.3390/app9050953

AMA Style

Liu C, Manz J, Tremblay JC. From Symmetry Breaking via Charge Migration to Symmetry Restoration in Electronic Ground and Excited States: Quantum Control on the Attosecond Time Scale. Applied Sciences. 2019; 9(5):953. https://doi.org/10.3390/app9050953

Chicago/Turabian Style

Liu, ChunMei, Jörn Manz, and Jean C. Tremblay. 2019. "From Symmetry Breaking via Charge Migration to Symmetry Restoration in Electronic Ground and Excited States: Quantum Control on the Attosecond Time Scale" Applied Sciences 9, no. 5: 953. https://doi.org/10.3390/app9050953

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