8 May 2018 Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta2NiSe5
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Abstract
The excitonic insulator (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.
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Daniel Werdehausen, Daniel Werdehausen, Steinn Ymir Agustsson, Steinn Ymir Agustsson, Minjae Kim, Minjae Kim, Parmida Shabestari, Parmida Shabestari, Emily Huang, Emily Huang, Amrit Pokharel, Amrit Pokharel, Timofei Larkin, Timofei Larkin, Alexander Boris, Alexander Boris, Tomohiro Takayama, Tomohiro Takayama, Yangfan Lu, Yangfan Lu, Andreas W. Rost, Andreas W. Rost, Hao Chu, Hao Chu, Alexander Yaresko, Alexander Yaresko, Marc Höppner, Marc Höppner, Armin Schulz, Armin Schulz, Dirk Manske, Dirk Manske, Bernhard Keimer, Bernhard Keimer, Hidenori Takagi, Hidenori Takagi, Stefan Kaiser, Stefan Kaiser, } "Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta2NiSe5", Proc. SPIE 10638, Ultrafast Bandgap Photonics III, 1063803 (8 May 2018); doi: 10.1117/12.2304795; https://doi.org/10.1117/12.2304795
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