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Institute of Materials Science and Engineering

IMSE Seminar with Jayakanth Ravichandran on Chalcogenides

Jayakanth Ravichandran from University of Southern California will be presenting the seminar "Quasi-1D Hexagonal Chalcogenides: Materials on the Edge!"

Phase change materials underpin many of the modern electronic and photonic technologies. The typical recipe for phase change materials is the presence of competing interactions between two or more degrees of freedom. This competition is enhanced in low dimensional materials. Many of the classic metal-insulator transitions such as charge density wave transitions are observed in low dimensional materials. In this talk, I will introduce a new class of materials known as quasi-1D hexagonal chalcogenides with face shared transition metal – chalcogen octahedra, especially BaTiS3. First, I will discuss the origin of large linear optical anisotropy in these materials in terms of birefringence, dichroism. Second, I will discuss the observation and possible explanations for density wave-like electronic transitions in BaTiS3. I will also discuss emerging understanding of the functionalities arising from subtle displacements in the atomic positions of these materials. Finally, I will provide a general outlook for future studies and applications of this exciting new class of materials.

References:

  1. Nature Communications, 11, 6039 (2020).
  2. Advanced Materials, 31 (33), 1902118 (2019).
  3. Nature Photonics, 12, 392-396 (2018).
  4. Chemistry of Materials, 30 (15), 4897-4901 (2018).

Jayakanth Ravichandran is an Associate Professor in the Mork Family Department of Chemical Engineering and Materials Science with courtesy appointment in Ming Hsieh Department of Electrical and Computer Engineering at University of Southern California. He holds the Philip and Cayley MacDonald early career chair. He received his Ph.D. degree from University of California, Berkeley in 2011. He performed post-doctoral research at Columbia University and briefly at Harvard University, before joining the current position. His research interests are in materials design, synthesis, characterization, and physical properties of complex materials for electronic, photonic, and energy applications. His honors include the 2020 TMS Young Leader Professional Development Award, 2020 Orange County Engineering Council Outstanding Engineering Merit Award, and 2017 Early Career Scholar in Materials Science by the Journal of Materials Research.

Faculty, students, and the general public are invited.