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TT: Fachverband Tiefe Temperaturen
TT 66: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
TT 66.1: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Observation of many-body-localization in substituted 1T-TaS2 — •Jesumony Jayabalan1, Gael Reecht1, Ricards Kristers Knipšis2, Florian K Diekmann3, Friedemann Queisser2, Walter Schnelle4, Ping Zhou1, Kai Rossnagel3, Ralf Schützhold2, Manuel Gruber1, and Uwe Bovensiepen1 — 1Uni. of Duisburg-Essen, Fakultät für Physik and CENIDE — 2HZ Dresden-Rossendorf, — 3CAU of Kiel and DESY — 4MPI for Chemical Physics of Solids, Dresden
Random modulations in the potential landscape are known to localize a single quantum particle, the Anderson localization leads, to stable non-thermalizing states. Adding interaction is expected to cause delocalization and a quick thermalization of such single particles, but in a strongly disordered system, the many-body quantum state itself becomes localized, known as the Many-Body Localization (MBL). Using time-resolved photoelectron spectroscopic measurements, we show that it is possible to realize MBL states in a Tungsten substituted 1T-TaS2 material. Electrons are excited by using a 1.51 eV, 50 fs pulses and a 6 eV probe pulse was used to photoemit electrons. In contrast to ultrafast (<20 fs) decay of doublons in pristine 1T-TaS2[1], we observe that some of the doublons decay in hundreds of femtosecond time scale, while the rest lasts for more than few microseconds. This observation is supported by scanning tunneling microscopic measurements and Fermi-Hubbard model calculations. Funding by DFG through QUAST-FOR5249 and SFB 1242 is acknowledged. [1] M. Ligges et al., Phys. Rev. Lett., 120, 166401 (2018).
Keywords: Strongly correlated systems; Many body localization; Doublons