| Title: | Self-amplified photo-induced gap quenching in a correlated electron material |
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| 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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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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: https://www.researchgate.net/publication/308804379_Self-amplified_photo-induced_gap_quenching_in_a_correlated_electron_material [accessed Apr 20, 2017]. |
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| Keywords: | high harmonic generation, charge-density wave material, 1T-TiSe2, non-equilibrium electron dynamics, ultrafast surface science |
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| Year of publishing: | 2016 |
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| Number of pages: | 8 |
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| Numbering: | 2015, 7 |
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| PID: | 20.500.12556/RUNG-3066-89df4357-1f14-2588-2b6f-15a29aebc806 |
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| COBISS.SI-ID: | 4770043 |
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| DOI: | DOI: 10.1038/ncomms12902 |
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| NUK URN: | URN:SI:UNG:REP:0QU6HIQH |
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| Publication date in RUNG: | 20.04.2017 |
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| Views: | 6454 |
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| Downloads: | 0 |
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