Our group is interested in understanding the emergence of novel states of matter at interfaces. In addition we aim to engineer devices to observe and manipulate new particles such as Majorana Fermions.

Proximity-Induced high Tc Superconductivity in Topological Insulators

proximityInterest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Towards these goals, our group built upon our success exfoliating high temperature superconductors and topological insulators to develop an entirely new method to generate the superconducting proximity effect. We produced high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi-2212. This enabled us to access higher temperature and energy scales for the superconducting proximity effect then ever previously observed in any semiconductor (let alone a topological insulator). This work has been expanded to reveal a proximity effect in graphite, the Doppler effect confirming Andreev reflection, and Modeling tunneling for the unconventional superconducting proximity effect. On-going efforts are aimed at expanding to new superconductors and topological materials .

 

New Device Architectures

 

Our group has recently developed a Cleanroom in a Glovebox where all stages of fabrication can be performed. We using this to develop new techniques to exfoliate on thin-films. This allows a wide array of combinations of topological, superconducting and magnetic materials to be combined, as well as device architectures. In addition, through careful choice of substrate and top gate (e.g graphene), we can tune the chemical potential, modify the material with light and probe using tunneling, Infrared and Raman.