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O: Fachverband Oberflächenphysik

O 84: 2D Materials: Electronic structure, excitations, etc. III (joint session O/HL/TT)

O 84.5: Vortrag

Donnerstag, 12. März 2026, 16:00–16:15, HSZ/0204

Spectroscopic Investigation of the Ni Valence States in NiTe₂ — •Tassaphon Tirasutt¹, Sheng-Huai Chen¹, Alexander C. Komarek¹, Chun-Fu Chang¹, Yu-Chieh Ku², Po-Yu Cho³, Chun Sum Brian Pang⁴, Mizuki Furo⁵, Naoki Ito⁵, Ulrich Burkhardt¹, Simone G. Altendorf¹, Atsushi Hariki⁵, and Liu Hao Tjeng¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²National Yang Ming Chiao Tung University, Hsinchu, Taiwan — ³National Synchrotron Radiation Research Center, Hsinchu, Taiwan — ⁴The University of British Columbia, Vancouver, Canada — ⁵Osaka Metropolitan University, Osaka, Japan

Nickel-based transition metal compounds exhibit a wide range of properties arising from the strongly correlated d electrons. In this study, we investigate NiTe₂, a layered transition-metal dichalcogenide with reported type-II Dirac semimetallic properties. While its topological nature has been the focus of interest, the fundamental question of the properties of the Ni ions in NiTe₂ has rarely been discussed. We address this issue using soft X-ray core-level and valence-band photoelectron spectroscopy, as well as Ni-L_2,3 absorption spectroscopy, combined with a theoretical approach using LDA+DMFT. Our findings provide insights into the Ni 3d occupation and degree of correlation of the Ni in a metallic ligand bath of the NiTe₂ system.

Keywords: Transition-metal dichalcogenides; Soft X-ray spectroscopy; Electronic structure