Joshua Goldberger, The Ohio State University, Axis-dependent conduction polarity in layered materials

Date: Mon. September 9th, 2019, 12:45 pm-1:45 pm
Location: Rockefeller 221 (Les Foldy Room)
Website: https://chemistry.osu.edu/people/goldberger.4

Axis-dependent conduction polarity in layered materials 

Department of Chemistry and Biochemistry, The Ohio State University, Columbus

Layered and two-dimensional materials have emerged as one of the most exciting families of solid-state compounds, due to the plethora of unique physical phenomena found in these materials coupled with advances in the characterization of structure and properties down to the single layer scale. Here, we will describe our efforts in developing new families of these compounds, and our recent discovery of axis-dependent conduction polarity these materials.  Electronic materials generally exhibit a single majority carrier type, electrons or holes. We have discovered that NaSn₂As₂, an exfoliatable van der Waals Zintl phase, simultaneously exhibits p-type behavior in-plane and n-type behavior along the cross-plane direction.  We will establish the origin of this phenomenon and its electronic structure fingerprints, show that it exists across many families of layered compounds, and discuss how it can be exploited to create new classes of electronic and thermoelectric devices. 

host: Walter Lambrecht