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THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator

MPG-Autoren
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Singla,  Rashmi
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Cotugno,  Giovanni
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, Oxford University, Clarendon Laboratory;

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Kaiser,  Stefan
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany;
4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany;

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Först,  Michael
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Mitrano,  Matteo
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Liu,  Haiyun
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Cartella,  Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Manzoni,  Cristian
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
IFN-CNR, Dipartimento di Fisica-Politecnico di Milano, Milan, Italy;

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Cavalleri,  Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Department of Physics, Oxford University, Clarendon Laboratory;

Volltexte (frei zugänglich)

PhysRevLett.115.187401.pdf
(Verlagsversion), 990KB

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Zitation

Singla, R., Cotugno, G., Kaiser, S., Först, M., Mitrano, M., Liu, H., et al. (2015). THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator. Physical Review Letters, 115(18): 187401. doi:10.1103/PhysRevLett.115.187401.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0028-F2DC-B
Zusammenfassung
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.