Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Scanning probe microscopy: light matter interaction at atomic scales
O 12.3: Vortrag
Montag, 9. März 2026, 15:30–15:45, HSZ/0403
THz-induced bilayer stacking dynamics in 1T-TaS2 — Shaoxiang Sheng1,2, Yang Yang3, Mohamad Abdo1, Li Chen4, Peize Lin5, •Kurt Lichtenberg1, Xinguo Ren3,5, Sheng Meng3,5, Susanne Baumann1, and Sebastian Loth1,6 — 1University of Stuttgart, Inst. for Functional Matter and Quantum Technologies — 2Tsientang Inst. for Advanced Study — 3IOP, Chinese Academy of Sciences — 4Songshan Lake Materials Laboratory — 5Inst. of Light Resources and Environmental Science, Henan Academy of Sciences — 6Center for Integrated Quantum Science and Technology (IQST), University of Stuttgart
The electronic properties of layered materials change dramatically with variations in the interlayer coupling and the stacking order [1]. We employ terahertz pump-probe spectroscopy in conjunction with scanning tunneling microscopy (STM) to investigate the role of stacking order dynamics and of domain structures in layered 1T-TaS2 at the atomic scale. TaS2 exhibits diverse charge-density wave (CDW) phases and an insulating ground state at low temperatures [2]. We show that terahertz pulses can induce insulator-to-metal transitions (IMTs) and reveal hidden electronic phases in 1T-TaS2 by manipulating the bilayer stacking at femtosecond time and atomic length scales. This tunability promises unprecedented ultrafast control over the electronic phases also in other layered materials, suggesting applications in reconfigurable quantum devices and neuromorphic computing.
[1]: S.-H. Lee, PRL 122, 106404 (2019) [2]: V Petkov, J. Phys.: Cond. Matt. 34 345401 (2022)
Keywords: scanning tunneling microscopy; terahertz-spectroscopy; charge-density waves; THz-STM; 2D-Material