Condensed Matter Seminar - "Interactions and Topology in a Hybrid Transition Metal Dichalcogenide"
- Event Type
- Seminar/Symposium
- Sponsor
- Physics - Condensed Matter
- Location
- ESB 190
- Date
- Oct 14, 2022 1:00 pm
- Speaker
- Haim Beidenkopf, Weizmann Institute of Science
- Contact
- Stephen Bullwinkel
- bullwink@illinois.edu
- Phone
- 217-333-1652
- Views
- 147
- Originating Calendar
- Physics - Condensed Matter Seminar
A small change in the crystal structure of a material can completely modify its electronic properties. This is the case in the transition metal dichalcogenide TaS2 where a slight rotation of the sulphur atoms from the trigonal prismatic 1H structure to the octahedral 1T varies it from a superconductor to a Mott insulator possibly hosting a spin liquid state. We have studied 4Hb-TaS2 that interleaves the 1T and 1H polytypes. This has allowed us to investigate using scanning tunneling spectroscopy the fate of a Mott insulator when coupled to a metal and the superconducting phase that results from sandwiching it with Mott insulating layers. In the former we find a quantum phase transition that can be induced by the STM tip, electric field and temperature which possibly signifies the onset of correlations among Anderson impurities (or of a Kondo lattice). In the latter we identify a topological nodal superconducting state which we attribute to interaction-promoted inter-orbital pairing.