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

Daniel Werdehausen; Steinn Y. Agustsson; Minjae Kim; Parmida Shabestari; Emily Huang; Amrit Pokharel; Timofei Larkin; Alexander Boris; Tomohiro Takayama; Yangfan Lu; Andreas W. Rost; Hao Chu; Alexander Yaresko; Marc Höppner; Armin Schulz; Dirk Manske; Bernhard Keimer; Hidenori Takagi; Stefan Kaiser

doi:10.1117/12.2304795

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

Daniel Werdehausen, Steinn Y. Agustsson, Minjae Kim, Parmida Shabestari, Emily Huang, Amrit Pokharel, Timofei Larkin, Alexander Boris, Tomohiro Takayama, Yangfan Lu, Andreas W. Rost, Hao Chu, Alexander Yaresko, Marc Höppner, Armin Schulz, Dirk Manske, Bernhard Keimer, Hidenori Takagi, Stefan Kaiser

School of Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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.

Original language	English
Title of host publication	Ultrafast Bandgap Photonics III
Editors	Michael K. Rafailov
Publisher	SPIE
Pages	1-7
Number of pages	7
ISBN (Electronic)	9781510617889
ISBN (Print)	9781510617872
DOIs	https://doi.org/10.1117/12.2304795
Publication status	Published - 8 May 2018
Event	Ultrafast Bandgap Photonics III 2018 - Orlando, United States Duration: 16 Apr 2018 → 19 Apr 2018 https://spie.org/sid/conferencedetails/ultrafast-bandgap-photonics?SSO=1

Publication series

Name	Proceedings of SPIE
Publisher	Society of Photo-optical Instrumentation Engineers
Volume	10638
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ultrafast Bandgap Photonics III 2018
Country/Territory	United States
City	Orlando
Period	16/04/18 → 19/04/18
Internet address	https://spie.org/sid/conferencedetails/ultrafast-bandgap-photonics?SSO=1

Keywords

Collective excitation
Exciton wave packet
Excitonic insulator
Non-equilibrium
Pump-probe
THz
Time-domain
Ultrafast

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10.1117/12.2304795

Werdehausen-2019-Ultrafast-dynamics-and-SPIE-1063803
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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Cite this

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 Ta₂NiSe₅. In M. K. Rafailov (Ed.), Ultrafast Bandgap Photonics III (pp. 1-7). Article 1063803 (Proceedings of SPIE; Vol. 10638). SPIE. https://doi.org/10.1117/12.2304795

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

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.",

keywords = "Collective excitation, Exciton wave packet, Excitonic insulator, Non-equilibrium, Pump-probe, THz, Time-domain, Ultrafast",

author = "Daniel Werdehausen and Agustsson, \{Steinn Y.\} and Minjae Kim and Parmida Shabestari and Emily Huang and Amrit Pokharel and Timofei Larkin and Alexander Boris and Tomohiro Takayama and Yangfan Lu and Rost, \{Andreas W.\} and Hao Chu and Alexander Yaresko and Marc H{\"o}ppner and Armin Schulz and Dirk Manske and Bernhard Keimer and Hidenori Takagi and Stefan Kaiser",

year = "2018",

month = may,

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doi = "10.1117/12.2304795",

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booktitle = "Ultrafast Bandgap Photonics III",

address = "United States",

note = "Ultrafast Bandgap Photonics III 2018 ; Conference date: 16-04-2018 Through 19-04-2018",

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Werdehausen, D, Agustsson, SY, Kim, M, Shabestari, P, Huang, E, Pokharel, A, Larkin, T, Boris, A, Takayama, T, Lu, Y, Rost, AW, 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 Ta₂NiSe₅. in MK 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

Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta₂NiSe₅. / Werdehausen, Daniel; Agustsson, Steinn Y.; Kim, Minjae et al.
Ultrafast Bandgap Photonics III. ed. / Michael K. Rafailov. SPIE, 2018. p. 1-7 1063803 (Proceedings of SPIE; Vol. 10638).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Ultrafast dynamics and coherent order parameter oscillations under photo-excitation in the excitonic insulator Ta2NiSe5

AU - Werdehausen, Daniel

AU - Agustsson, Steinn Y.

AU - Kim, Minjae

AU - Shabestari, Parmida

AU - Huang, Emily

AU - Pokharel, Amrit

AU - Larkin, Timofei

AU - Boris, Alexander

AU - Takayama, Tomohiro

AU - Lu, Yangfan

AU - Rost, Andreas W.

AU - Chu, Hao

AU - Yaresko, Alexander

AU - Höppner, Marc

AU - Schulz, Armin

AU - Manske, Dirk

AU - Keimer, Bernhard

AU - Takagi, Hidenori

AU - Kaiser, Stefan

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AB - 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.

KW - Collective excitation

KW - Exciton wave packet

KW - Excitonic insulator

KW - Non-equilibrium

KW - Pump-probe

KW - THz

KW - Time-domain

KW - Ultrafast

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DO - 10.1117/12.2304795

M3 - Conference contribution

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SN - 9781510617872

T3 - Proceedings of SPIE

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BT - Ultrafast Bandgap Photonics III

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PB - SPIE

T2 - Ultrafast Bandgap Photonics III 2018

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