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Title:Self-amplified photo-induced gap quenching in a correlated electron material
Authors:ID Stefan, Mathias, Physical Institute, University of Göttingen (Author)
ID Steffen, Eich, Department of Physics, Universityof Kaiserslautern (Author)
ID Urbančič, Jurij, Department of Physics, Universityof Kaiserslautern (Author), et al.
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Capturing the dynamic electronic band structure of a correlated material presents a powerful capability for uncovering the complex couplings between the electronic and structural degrees of freedom. When combined with ultrafast laser excitation, new phases of matter can result, since far-from-equilibrium excited states are instantaneously populated. Here, we elucidate a general relation between ultrafast non-equilibrium electron dynamics and the size of the characteristic energy gap in a correlated electron material. We show that carrier multiplication via impact ionization can be one of the most important processes in a gapped material, and that the speed of carrier multiplication critically depends on the size of the energy gap. In the case of the charge-density wave material 1T-TiSe 2 , our data indicate that carrier multiplication and gap dynamics mutually amplify each other, which explains—on a microscopic level—the extremely fast response of this material to ultrafast optical excitation. Self-amplified photo-induced gap quenching in a correlated electron material. Available from: [accessed Apr 20, 2017].
Keywords:high harmonic generation, charge-density wave material, 1T-TiSe2, non-equilibrium electron dynamics, ultrafast surface science
Year of publishing:2016
Number of pages:8
Numbering:2015, 7
PID:20.500.12556/RUNG-3066-89df4357-1f14-2588-2b6f-15a29aebc806 New window
COBISS.SI-ID:4770043 New window
DOI:DOI: 10.1038/ncomms12902 New window
Publication date in RUNG:20.04.2017
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Record is a part of a journal

Title:Nature Communications
Publisher:Nature Publishing Group: Nature Communications
Year of publishing:2016