Monolayer transition metal dichalcogenides (TMDCs) exhibit a large degree of polymorphism in crystal structures (2H, 1T and 1T’) leading to a wide array of differing physical and chemical properties.
A collaborative effort from University of Southern California, Rice University and SLAC have identified that strong optical excitations induce lattice instabilities in monolayer TMDC crystals that lead to formation of high-energy metastable crystal structures
These metastable crystal structures provide low-energy pathways for phase transformations between the semiconducting and metallic polymorphs of TMDC, leading to the formation of lateral semiconducting-metallic heterojunctions, which are critical for 2D optoelectronic devices.
- Rapid semiconductor-to-metal phase transition in MoTe2 monolayers enabled by electronic excitation. A. Krishnamoorthy, L. Bassman, R. Kalia, A. Nakano, F. Shimojo, P. Vashishta, Submitted
PIs involved in this research
- Aiichiro Nakano, Priya Vashishta (USC)
- Pulickel Ajayan (Rice)
- Uwe Bergmann, David Fritz (SLAC)