Van der Waals Bonded Materials: From Quasi-2D to Quasi-1D*

The advent of graphene stimulated interest to other two-dimensional (2D) van der Waals materials. In the first part of my talk, I will describe interesting phenomena emerging in 2D transition metal dichalcogenides (TMDs), which reveal charge density wave (CDW) phases [1-2]. Bonding and integrating three different 2D materials, 1T-TaS₂, graphene and h-BN, in a way that exploited the unique characteristics of each, we were able to demonstrate a voltage controlled oscillator (VCO) functioning at room temperature [2]. In the second part of my talk, I will explain why the research of 2D materials should be extended to the one-dimensional (1D) van der Waals materials. Using transition metal trichalcogenides (TMTs) such as TaSe₃ we demonstrated prototype “atomic wire” interconnects with extraordinary current density [3-4]. I will present results, which show that integration of quasi-2D and quasi-1D van der Waals materials can lead to new functionality, previously not achievable.

[1] R. Samnakay, et al., Nano Lett., 15, 2965 (2015); [2] G. Liu, et al., Nature Nano, 11, 845 (2016); [3] M. A. Stolyarov, et al., Nanoscale, 8, 15774 (2016); [4] G. Liu, et al., Nano Lett., 17, 377 (2017).