Dimensionally-controlled studies of heat and charge transport in 1D, 2D, and 3D nanoscale materials

Heat and charge are fundamental energy carrying modes relevant to nearly all condensed matter physics and modern energy technologies. Here, I will discuss the design and understanding of transport properties in complex nanoscale systems where the dimensional constraints are changed systematically to reveal fundamental principles of heat and charge transport. The first part of this talk will focus on heat and charge transport in mixed-dimensional polymeric and hybrid nanomaterials, revealing unexpected behavior such as thermal rectification and thermal memristance. I will then cover recent insights into thermal conductivity in 2D and 3D halide perovskites and new AC Seebeck measurement tools for perovskites and ionic conductors, uncovering insight into the origins of low thermal conductivity. I will conclude the talk with 1D and 2D studies of heat transport in silicon nanomeshes and collaborative work on vanadium dioxide nanowires.
1. Organic electronics: one model to rule them all, Nature Materials (2017)
2. Ultralow thermal conductivity in all inorganic halide perovskites, PNAS(2017)
3. Investigation of phonon coherence and backscattering using silicon nanomeshes, Nature Comms (2017).
4. Anomalously low electronic thermal conductivity in metallic vanadium dioxide, Science (2017)