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

Research output: Contribution to book/Conference proceedings/Anthology/Report › Conference contribution › Contributed › peer-review

Contributors

  • Daniel Werdehausen - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Steinn Y. Agustsson - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Minjae Kim - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Parmida Shabestari - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Emily Huang - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Amrit Pokharel - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Timofei Larkin - , Max Planck Institute for Solid State Research (Author)
  • Alexander Boris - , Max Planck Institute for Solid State Research (Author)
  • Tomohiro Takayama - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Yangfan Lu - , The University of Tokyo (Author)
  • Andreas W. Rost - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Hao Chu - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)
  • Alexander Yaresko - , Max Planck Institute for Solid State Research (Author)
  • Marc Höppner - , Max Planck Institute for Solid State Research (Author)
  • Armin Schulz - , Max Planck Institute for Solid State Research (Author)
  • Dirk Manske - , Max Planck Institute for Solid State Research (Author)
  • Bernhard Keimer - , Max Planck Institute for Solid State Research (Author)
  • Hidenori Takagi - , Max Planck Institute for Solid State Research, University of Stuttgart, The University of Tokyo (Author)
  • Stefan Kaiser - , Max Planck Institute for Solid State Research, University of Stuttgart (Author)

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.

Details

Original languageEnglish
Title of host publicationUltrafast Bandgap Photonics III
EditorsMichael K. Rafailov
PublisherSPIE - The international society for optics and photonics, Bellingham
ISBN (electronic)9781510617872
Publication statusPublished - 2018
Peer-reviewedYes
Externally publishedYes

Publication series

SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume10638
ISSN0277-786X

Conference

TitleUltrafast Bandgap Photonics III 2018
Duration16 - 19 April 2018
CityOrlando
CountryUnited States of America

External IDs

ORCID /0000-0001-9862-2788/work/142255351

Keywords

ASJC Scopus subject areas

Keywords

  • collective excitation, exciton wave packet, excitonic insulator, non-equilibrium, pump-probe, THz, timedomain, ultrafast