I am interested in investigating electronic correlations in a variety of topological phases of quantum matter using transport and thermal measurements such as the Hall effect, magnetoresistance, thermopower and thermal Hall effect. Systems of interest include three-dimensional topological insulators, three-dimensional semimetals such as Dirac and Weyl semimetals, topological superconductors and quantum spin liquids.
The combination of edge states in topological materials and superconductivity has attracted much theoretical interest. However, experimental realizations of topological superconductors are very limited. In 2014, the first experimental realization of Josephson junctions in a two-dimensional topological insulator, HgTe/HgCdTe, was reported, as well as the first observation of an edge supercurrent. A recent breakthrough, made by my team in collaboration with our Princeton collaborator Bob Cava, has been the discovery of an edge supercurrent in the three-dimensional topological superconductor MoTe2. My goal is to examine many properties of this edge supercurrent that so far remain unknown.
My group is also studying a class of magnetic materials called quantum spin liquids, in which spins strongly interact but an ordered magnetic state is never attained because of conflicting demands imposed by geometric frustration. We are working on a novel instrumentation to detect and explore the nature of the spin excitations in spin liquids.
Emergent Phenomena in Quantum Systems
Princeton University, Department of Physics