Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 59: 2D Materials: Electronic structure, excitations, etc. II (joint session O/HL/TT)

O 59.7: Vortrag

Mittwoch, 11. März 2026, 12:00–12:15, TRE/MATH

Moir’e modulated quantum spin liquid candidate 1T-TaSe2 — Ziying Wang, Adolfo O. Fumega, Ana Vera Montoto, Mohammad Amini, Büsra Gamze Arslan, Ales Cahlik, Yuxiao Ding, Jose L. Lado, •Robert Drost, and Peter Liljeroth — Aalto University, Department of Applied Physics

Quantum spin liquids continue to fascinate with their highly entangled quantum states and promises of fractional many-body excitations. Yet there are few tools to probe these materials, and none sensitive enough for applications in 2D materials. This seriously hampers the study of monolayer QSL candidates such as α-RuCl3 and 1T-TaSe2. Scanning tunneling microscopy and spectroscopy may overcome this challenge, as they can access the fundamental excitations of 2D samples through inelastic tunneling spectroscopy. These low-energy excitations can be compared against theoretical models and provide fingerprints of QSL states. We employ this approach against the quantum spin liquid candidate 1T-TaSe2. We observe the emergence of a root 3 reconstruction driven by the substrate, equivalent spectroscopy across all spin sites, and the coexistence of zero and finite energy excitations. These observations are consistent with a QSL ground state. Our results demonstrate that IETS provides a powerful route to obtain atomic-scale insight into the magnetic excitations of two-dimensional materials. Spectral fingerprints may help to identify exotic phases of matter that are otherwise difficult to detect.

Keywords: Quantum Spin Liquids; TaSe2; 2D Materials; Spin excitations