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TT: Fachverband Tiefe Temperaturen

TT 54: Correlated Electrons: Charge Order

TT 54.2: Vortrag

Freitag, 21. März 2025, 09:45–10:00, H33

Visualizing p-Orbital Texture in the Charge Density Wave State of CeSbTe — Xinglu Que¹, Qingyu He¹, Lihui Zhou¹, Shiming Lei², Leslie Schoop³, •Dennis Huang¹, and Hidenori Takagi^{1, 4, 5} — ¹Max Planck Institute for Solid State Research, Stuttgart, Germany — ²Hong Kong University of Science and Technology, China — ³Princeton University, USA — ⁴University of Stuttgart, Germany — ⁵University of Tokyo, Japan

The collective reorganization of electrons into a charge density wave (CDW) inside a crystal has long served as a textbook example of an ordered phase in condensed matter physics. Two-dimensional square lattices with p electrons are well-suited to the realization of CDW, due to the anisotropy of the p orbitals and the resulting one dimensionality of the electronic structure. In spite of a long history of study of CDW in square-lattice systems, few reports have recognized the existence and significance of a hidden orbital degree of freedom. The degeneracy of p_x and p_y electrons inherent to a square lattice may give rise to nontrivial orbital patterns in real space that endow the CDW with additional broken symmetries or unusual order parameters. Using scanning tunneling microscopy, we visualize signatures of p-orbital texture in the CDW state of the topological semimetal candidate CeSbTe, which contains Sb square lattices with 5p electrons. We image atomic-sized, anisotropic lobes of charge density with periodically modulating anisotropy, that ultimately can be mapped onto a microscopic pattern of p_x and p_y bond density waves.

Keywords: Scanning tunneling microscopy; Charge density wave; Square net system; Orbital ordering; Topological semimetal candidate