Year: 2023
Type: article
Abstract: Square-net tellurides host an array of electronic ground states and commonly exhibit charge-density-wave ordering. Here, we report the epitaxy of DyTe 2−δ on atomically flat MgO (001) using molecular beam epitaxy. The films are single phase and highly oriented, as evidenced by transmission electron microscopy and X-ray diffraction measurements. Epitaxial strain is evident in films and is relieved as the thickness increases up to a value of approximately 20 quintuple layers. Diffraction features associated with a supercell in the films are resolved, which is coupled with Te-deficiency. First principles calculations attribute the formation of this defect lattice to nesting conditions in the Fermi surface, which produce a periodic occupancy of the conducting Te square-net and open a band gap at the chemical potential. This work establishes the groundwork for exploring the role of strain in tuning the electronic and structural phases of epitaxial square-net tellurides and related compounds.
Source: Crystal Growth & Design
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Gordon and Betty Moore Foundation, Kavli Foundation, California Institute of Technology, Cornell Center for Materials Research, California State University, Northridge, Materials Research Science and Engineering Center, Harvard University, Institute for Quantum Information and Matter, California Institute of Technology, Division of Physics, Division of Materials Research, Air Force Office of Scientific Research
Awards: G1205195086, G1321126357, G1734011414, G2138945613, G2403330605, G2414013413, G2415270547, G2762038869, CSUN/Caltech-IQIM Partnership, G2958415499, G2968669339, PREM: Partnership between CSUN and Princeton for Quantum Materials, G3663113145, Cornell Center for Materials Research - MRSEC, G4303070870, The Institute for Quantum Information and Matter: Advancing the Entanglement Frontier, MIP: Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Joseph Falson, Moore Fellow in Materials Synthesis, G5917061246, G6351810044, G6837474572, G6957738301, G7426296878, G7767248047, MIP: Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), G961819192
OpenAlex ID: W4389702625