Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 32: 2D Materials 2 (joint session DS/HL)
HL 32.2: Talk
Wednesday, March 11, 2026, 15:15–15:30, REC/C213
Superconducting and dielectric properties of monolayer α-TaSi2N4 — •Timon Mosko1 and Martin Gmitra1,2 — 1Institute of Physics, Pavol Jozef Safarik University in Kosice, Park Angelinum 9, 04001 Kosice, Slovakia — 2Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Kosice, Slovakia
The monolayer α-TaSi2N4 belongs to the recently discovered MA2Z4 family of two-dimensional intercalated materials, exhibiting wide range of physical properties, including semiconducting, metallic, topological, and superconducting behavior. Members of this group, such as MoSi2N4, WSi2N4 have already been successfully synthesized, highlighting the structural and electronic tunability of the inspected group of materials. We investigated the superconducting and dielectric properties of monolayer α-TaSi2N4 using a combination of ab initio and effective model approaches. The phonon-mediated superconductivity is examined through first-principles calculations, an effective tight-binding Hamiltonian in Wannier basis and further analyzed within the Migda-Eliashberg theory of superconductivity. Our results reveal that α-TaSi2N4 is an anisotropic two-band superconductor. Additionally, we study the dielectric response via electric susceptibility using linear response theory within the RPA, combining Green’s function formalism with tight-binding modeling.
This work was supported by the Slovak Academy of Sciences project IMPULZ IM-2021-42, and by the Ministry of Education, Research, Development and Youth of the Slovak Republic, provided under Grant No. VEGA 1/0104/25.
Keywords: novel materials; TaSi2N4; two-band-superconductor; electron-phonon-coupling