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THU: Thursday Contributed Sessions
THU 8: Frustrated Quantum Systems: Contributed Session to Symposium
THU 8.3: Talk
Thursday, September 11, 2025, 14:45–15:00, ZHG009
Optical investigations of incommensurate κ-BEDT-TTF based molecular quantum materials — •Savita Priya1, Juraj Ovčar2, Maxim Wenzel1, Jesse Liebman3, Takuya Kobayashi4, Hiromi Taniguchi4, Dita Puspita Sari5, Yasuyuki Ishii5, Kazushi Kanoda1,6,7, Ivor Lončarić2, Natalia Drichko3, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Ruder Bošković Institute, Zagreb — 3Department of Physics and Astronomy, Johns Hopkins University — 4Department of Physics, Saitama University — 5Global Course of Engineering and Science, SIT, Tokyo — 6Department of Advanced Materials Science, University of Tokyo — 7MPI-FKF, Stuttgart
κ-BEDT-TTF based charge transfer salts are correlated electron system. Their distinct triangular lattice arrangement is highly susceptible to geometric and magnetic frustration, leading to exotic phases like quantum-spin liquids, antiferromagnetism, charge ordering, Mott-insulator and superconductivity at low temperatures. In our study, we focus on κ-(BEDT-TTF)4Hg2.89Br8 and κ-(BEDT-TTF)4Hg2.78Cl8 by broadband infrared spectroscopy and Raman scattering spectroscopy to examine the effects of the non-stoichiometric anion layer as a crucial parameter on geometric frustration and their unusual response. Optical spectroscopy methods allow us to study these compounds by probing the electronic and structural responses (by molecular and lattice vibrations) with temperature. The well-resolved electronic response enables us to employ theories of correlated physics, strengthening our understanding of these unusual κ-phase salts.
Keywords: electronic correlations; optical spectroscopy