title: Solvothermally Synthesized Sb2Te3 Platelets Show Unexpected Optical Contrasts in Mid-Infrared Near-Field Scanning Microscopy.
abstract: We report nanoscale-resolved optical investigations on the local material properties of Sb2Te3 hexagonal platelets grown by solvothermal synthesis. Using mid-infrared near-field microscopy, we find a highly symmetric pattern, which is correlated to a growth spiral and which extends over the entire platelet. As the origin of the optical contrast, we identify domains with different densities of charge carriers. On Sb2Te3 samples grown by other means, we did not find a comparable domain structure.
authors: †Institute of Physics (IA) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.
authors: Benedikt
authors: B
authors: Hauer
authors: ‡Institute of Inorganic Chemistry (IAC) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.
authors: Tobias
authors: T
authors: Saltzmann
authors: ‡Institute of Inorganic Chemistry (IAC) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.
authors: Ulrich
authors: U
authors: Simon
authors: †Institute of Physics (IA) and JARA - Fundamentals of Future Information Technologies, RWTH Aachen University, 52056 Aachen, Germany.
authors: Thomas
authors: T
authors: Taubner
mesh_terms: D000965:Antimony / Q000737:chemistry*; D001792:Blood Platelets / Q000737:chemistry / Q000648:ultrastructure*; D003460:Crystallization; D006801:Humans; D007259:Infrared Rays; D008853:Microscopy; D036103:Nanotechnology; D055095:Optics and Photonics; D013691:Tellurium / Q000737:chemistry*
chemical_list: D000965:Antimony; D013691:Tellurium
keywords: Nanoplatelet; crystal growth; free charge carriers; screw dislocation; topological insulator