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Valence band momentum imaging of NiTe₂ by two-photon photoemission momentum microscopy

Mukesh Singh, Prabesh Bista, Yu-Chan Lin, Chia-Nung Kuo, Yu-Jhen Chuang, Maximilian Paleschke, Chen-Bin Huang, Ming-Chiang Chung, Chin Shan Lue, Cheng-Tien Chiang

Appl. Phys. Lett. 128, 031601 (2026)

Valence band momentum imaging of NiTe2 by two-photon photoemission momentum microscopy

Two-photon photoemission (2PPE) spectroscopy on NiTe₂ is performed by the combination of femtosecond ultraviolet laser pulses with time-of-flight photoelectron momentum microscopy. At the photon energies of 2.9 and 3.1 eV, the bulk Te 5p_z valence bands as well as the spin–orbit split Te 5p_x,y valence bands are identified. Detailed momentum patterns of the Te 5p_x,y bands are revealed, and the size of their splitting is estimated as 0.5^+0.2_-0.1 eV. Our 2PPE experiments on NiTe₂ would open up the opportunities for future time-resolved studies of its unoccupied electronic states.

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Latest update 2026-02-07 15:06:21

Institute of Atomic and Molecular Sciences Academia Sinica

Presentation of Dr. Cheng-Tien Chiang