Photo-excitation band-structure engineering of 2H-NbSe\(_2\) probed by time- and angle-resolved photoemission spectroscopy
We investigated the nonequilibrium electronic structure of 2H-NbSe\(_2\) by time- and angle-resolved photoemission spectroscopy. We find that the band structure is distinctively modulated by strong photo-excitation, as indicated by the unusual increase in the photoelectron intensities around E\(_F\)...
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Abstract | We investigated the nonequilibrium electronic structure of 2H-NbSe\(_2\) by time- and angle-resolved photoemission spectroscopy. We find that the band structure is distinctively modulated by strong photo-excitation, as indicated by the unusual increase in the photoelectron intensities around E\(_F\). In order to gain insight into the observed photo-induced electronic state, we performed DFT calculations with modulated lattice structures, and found that the variation of the Se height from the Nb layer results in a significant change in the effective mass and band gap energy. We further study the momentum-dependent carrier dynamics. The results suggest that the relaxation is faster at the K-centered Fermi surface than at the \(\Gamma\)-centered Fermi surface, which can be attributed to the stronger electron-lattice coupling at the K-centered Fermi surface. Our demonstration of band structure engineering suggests a new role for light as a tool for controlling the functionalities of solid-state materials. |
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AbstractList | We investigated the nonequilibrium electronic structure of 2H-NbSe\(_2\) by time- and angle-resolved photoemission spectroscopy. We find that the band structure is distinctively modulated by strong photo-excitation, as indicated by the unusual increase in the photoelectron intensities around E\(_F\). In order to gain insight into the observed photo-induced electronic state, we performed DFT calculations with modulated lattice structures, and found that the variation of the Se height from the Nb layer results in a significant change in the effective mass and band gap energy. We further study the momentum-dependent carrier dynamics. The results suggest that the relaxation is faster at the K-centered Fermi surface than at the \(\Gamma\)-centered Fermi surface, which can be attributed to the stronger electron-lattice coupling at the K-centered Fermi surface. Our demonstration of band structure engineering suggests a new role for light as a tool for controlling the functionalities of solid-state materials. |
Author | Kanai, Teruto Shin, Shik Watanabe, Mari Michimae, Shoya Someya, Takashi Suzuki, Takeshi Fujisawa, Masami Okazaki, Kozo Ogawa, Yu Itatani, Jiro Saitoh, Tomohiko |
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Title | Photo-excitation band-structure engineering of 2H-NbSe\(_2\) probed by time- and angle-resolved photoemission spectroscopy |
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