Ultrafast dynamics and coherent order parameter oscillations under 
photo-excitation in the excitonic insulator Ta2NiSe5

Werdehausen, D.; Agustsson, S.; Kim, M.; Shabestari, P.; Huang, E.; Pokharel, A.; Larkin, T.; Boris, A.; Takayama, T.; Lu, Y.; Rost, A. W.; Chu, H.; Yaresko, A.; Höppner, M.; Schulz, A.; Manske, D.; Keimer, B.; Takagi, H.; Kaiser, S.

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Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta₂NiSe₅

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Boris, A.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Yaresko, A.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Schulz, A.
Miscellaneous, Max Planck Institute for Solid State Research, Max Planck Society;

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Manske, D.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Takagi, H.
Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society;

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Kaiser, S.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Werdehausen, D., Agustsson, S., Kim, M., Shabestari, P., Huang, E., Pokharel, A., et al. (2018). Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta₂NiSe₅. Proceedings of SPIE, 10638: UNSP 1063803.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D350-9

Abstract

The excitonic insulator D(EI) is an intriguing phase of condensed excitons undergoing a Bose-Einstein-Condensation (BEC)-type transition. A prominent candidate has been identified in Ta2NiSe5. Ultrafast spectroscopy allows tracing the coherent response of the EI condensate directly in the time domain Probing the collective electronic response we can identify fingerprints for the Higgs-amplitude equivalent mode of the condensate. In addition we find a peculiar coupling of the EI phase to a low frequency phonon mode. We will discuss the transient response on multiple energies scales ranging from the exciton dynamics to the coherent THz response of the gap.