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

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Werdehausen_2019_Ultrafast_dynamics_and_SPIE_1063803.pdf (795.9Kb)
Date
08/05/2018
Author
Werdehausen, Daniel
Agustsson, Steinn Y.
Kim, Minjae
Shabestari, Parmida
Huang, Emily
Pokharel, Amrit
Larkin, Timofei
Boris, Alexander
Takayama, Tomohiro
Lu, Yangfan
Rost, Andreas W.
Chu, Hao
Yaresko, Alexander
Höppner, Marc
Schulz, Armin
Manske, Dirk
Keimer, Bernhard
Takagi, Hidenori
Kaiser, Stefan
Keywords
Collective excitation
Exciton wave packet
Excitonic insulator
Non-equilibrium
Pump-probe
THz
Time-domain
Ultrafast
QA75 Electronic computers. Computer science
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Computer Science Applications
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials
Applied Mathematics
Condensed Matter Physics
T-NDAS
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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.
Citation
Werdehausen , D , Agustsson , S Y , 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 2018 , Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta 2 NiSe 5 . in M K Rafailov (ed.) , Ultrafast Bandgap Photonics III . , 1063803 , Proceedings of SPIE , vol. 10638 , SPIE , pp. 1-7 , Ultrafast Bandgap Photonics III 2018 , Orlando , Florida , United States , 16/04/18 . https://doi.org/10.1117/12.2304795
 
conference
 
Publication
Ultrafast Bandgap Photonics III
DOI
https://doi.org/10.1117/12.2304795
ISSN
0277-786X
Type
Conference item
Rights
Copyright © 2018 SPIE. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1117/12.2304795
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/18974

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