Terahertz displacive excitation of a coherent Raman-active phonon in V2O3
Giorgianni, Flavio (Paul Scherrer Institut (Suïssa))
Udina, Mattia (Università degli studi di Roma "La Sapienza". Department of Physics)
Cea, Tommaso (IMDEA Nanoscience)
Paris, Eugenio (Paul Scherrer Institut (Suïssa))
Caputo, Marco (Photon Science Division. Paul Scherrer Institute)
Radovic, Milan (Photon Science Division. Paul Scherrer Institute)
Boie, Larissa (ETH Zurich. Physics Department)
Sakai, Joe (Institut Català de Nanociència i Nanotecnologia)
Schneider, Christof W. (Paul Scherrer Institut (Suïssa))
Johnson, Steven Lee (ETH Zurich. Physics Department)

Date:	2022
Abstract:	Nonlinear processes involving frequency-mixing of light fields set the basis for ultrafast coherent spectroscopy of collective modes in solids. In certain semimetals and semiconductors, generation of coherent phonon modes can occur by a displacive force on the lattice at the difference-frequency mixing of a laser pulse excitation on the electronic system. Here, as a low-frequency counterpart of this process, we demonstrate that coherent phonon excitations can be induced by the sum-frequency components of an intense terahertz light field, coupled to intraband electronic transitions. This nonlinear process leads to charge-coupled coherent dynamics of Raman-active phonon modes in the strongly correlated metal VO. Our results show an alternative up-conversion pathway for the optical control of Raman-active modes in solids mediated by terahertz-driven electronic excitation.
Grants:	European Commission 604391
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Coherent phonons ; Coherent spectroscopies ; Collective modes ; Frequency mixing ; Light fields ; Nonlinear process ; Phonon mode ; Raman-active phonon ; Tera Hertz ; Ultra-fast
Published in:	Communications Physics, Vol. 5 (2022) , art. 103, ISSN 2399-3650

DOI: 10.1038/s42005-022-00882-7

7 p, 1.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles