March 16-21, 2025, Anaheim, CA and virtual
Poster Session

Poster Session III: DCMP, DMP, DLS, DAMOP, DQI, GQMS, GERA, GIMS, GPC, GMAG, GCCM

10:00 am – 1:00 pm, Thursday March 20 Session MAR-R00 Anaheim Convention Center, Exhibit Hall A
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Visualization of Inhomogeneous Charge and Lattice Structure on TaTe2

Poster 131
Presenter: Nathaniel B Lowe (University of Alabama)
Authors: Yi Lin (University of Alabama), Garrett Mappin (University of Alabama), Cheng Hsun Wu (University of California Berkeley), Alessandra Lanzara (University of California, Berkeley), Christopher Jozwiak (Lawrence Berkeley National Lab), Aaron Bostwick (Lawrence Berkeley National Lab), Zhiqiang Mao (Pennsylvania State University), Luca Moreschini (University of California, Berkeley), Cheng Hu (Lawrence Berkeley National Lab), Maximillian Huber (Lawrence Berkeley National Lab)

Charge density wave (CDW) materials exhibit both periodic charge modulation and corresponding lattice distortions, often serving as an ideal platform to study electron-lattice interactions. Tantalum ditelluride (TaTe2) is a layered transition metal dichalcogenide and has been extensively studied for its CDW properties. The CDW phase in TaTe2 has been explored using techniques such as electron microscopy, diffraction, and optical spectroscopy on surfaces with sufficient homogeneity. However, the role of surface inhomogeneity in the material and its impact on the coupling between charge and lattice of the CDW phases remains less studied. Our group used synchrotron-based angle-resolved photoemission spectroscopy (ARPES) to study the electronic band structure in TaTe2 with sub-micrometer spatial resolution. We discovered the existence of multiple highly oriented charge domains on the surface of TaTe2, with an unexpected additional rotational degree of freedom. For each charge domain, we inspect its band structure and Fermi surface while probing its lattice structure with electron diffraction techniques. By simultaneously examining both charge and lattice orders, we directly address electron-lattice interactions in the material, offering new insights into the formation mechanism of the rotational charge-ordered structure.

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