Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 29: 2D Materials: Electronic Structure and Exitations II (joint session O/HL/TT)
TT 29.5: Vortrag
Mittwoch, 19. März 2025, 11:45–12:00, H11
Structural modulations of unidirectional charge density waves in rare earth tellurides — •Eunseo Kim1, Sanghun Lee1, Junho Bang1, Hyungryul Yang1, Jongho Park2, Changyoung Kim2, Dirk Wulferding2, Doohee Cho1, Makoto Hashimito3, Donghui Lu3, and Sunghun Kim4 — 1Department of Physics, Yonsei University, Seoul 03722, Republic of Korea — 2Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea — 3Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA — 4Department of Physics, Ajou University, Suwon 16499, Korea
Charge density waves (CDWs) in rare earth tellurides (RTe3) provide a unique platform for exploring the interplay between lattice deformations and electronic order. Using scanning tunneling microscopy and spectroscopy (STM/S), we investigate unique surface features in two different materials, GdTe3 and DyTe3, that influence the CDW behavior. In GdTe3, twin domain boundaries provide a static platform for observing the spatial "melting" of unidirectional CDWs and the emergence of bidirectional CDWs. Our spatial lock-in analysis demonstrates the attenuation of CDW order parameters and the proliferation of topological defects at these boundaries, correlating with enhanced local density of states near the Fermi level. In DyTe3, nanowrinkles act as topological interfaces, hosting phase-winding CDWs and confining one-dimensional metallic states. These findings emphasize the role of local structural distortions in shaping CDW phenomena, offering insights into manipulating quantum states via lattice engineering.
Keywords: scanning tunneling microscopy; charge density waves; rare earth tellurides; topological defects; structural deformations