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Visualization of Inhomogeneous Charge and Lattice Structure on TaTe<sub>2</sub>

POSTER

Abstract

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.

Presenters

  • Nathaniel B Lowe

    University of Alabama

Authors

  • Nathaniel B Lowe

    University of Alabama

  • Yi Lin

    University of Alabama

  • Garrett J Mappin

    University of Alabama

  • Cheng Hsun Wu

    University of California Berkeley

  • Alessandra Lanzara

    University of California, Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA, USA, Department of Physics, University of California, Berkeley

  • Christopher Jozwiak

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, E.O. Lawerence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Aaron Bostwick

    ALS, LBNL, Berkeley, Lawrence Berkeley National Lab, Lawrence Berkeley National Laboratory, Advanced Light Source, LBNL, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Zhiqiang Mao

    Pennsylvania State University

  • Luca Moreschini

    University of California, Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA, USA, Department of Physics, University of California, Berkeley

  • Cheng Hu

    Lawrence Berkeley National Lab

  • Maximillian Huber

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab