title: THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator.
abstract: We use midinfrared pulses with stable carrier-envelope phase offset to drive molecular vibrations in the charge transfer salt ET-F_{2}TCNQ, a prototypical one-dimensional Mott insulator. We find that the Mott gap, which is probed resonantly with 10 fs laser pulses, oscillates with the pump field. This observation reveals that molecular excitations can coherently perturb the electronic on-site interactions (Hubbard U) by changing the local orbital wave function. The gap oscillates at twice the frequency of the vibrational mode, indicating that the molecular distortions couple quadratically to the local charge density.
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Singla
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.|Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Cotugno
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.|Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.|4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Kaiser
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Först
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Mitrano
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: H Y
authors.initials: HY
authors.lastname: Liu
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Cartella
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.|IFN-CNR, Dipartimento di Fisica-Politecnico di Milano, Milan, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Manzoni
authors.affiliation: Department of Advanced Material Science, University of Tokyo, Chiba 277-8561, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Okamoto
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.affiliation: Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.|Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom.
authors.forename: S R
authors.initials: SR
authors.lastname: Clark
authors.affiliation: Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.|Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.
authors.forename: D
authors.initials: D
authors.lastname: Jaksch
authors.affiliation: Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.|Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, OX1 3PU Oxford, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Cavalleri