Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 91, Issue 6, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.91.064703
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Funding
- Japan Society for the Promotion of Science (JSPS) [JP18K13498, JP19H01818, JP19H00651]
- JSPS KAKENHI [JP19H05826]
- Center of Innovation Program from the Japan Science and Technology Agency, JST
- MEXT Quantum Leap Flagship Program (MEXT Q-LEAP), Japan [JPMXS0118068681]
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We investigated the nonequilibrium electronic structure of 2H-NbSe2 using time-and angle-resolved photoemission spectroscopy. We found that strong photo-excitation distinctly modulates the band structure, allowing for control of the functionalities of solid-state materials.
We investigated the nonequilibrium electronic structure of 2H-NbSe2 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 EF. 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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