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-F2TCNQ, 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.

References in corpus (4)

• Many-Body Physics with Ultracold Gases
• Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
• Theory of nonlinear phononics for coherent light-control of solids
• THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator

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