Supercurrent in Graphene Josephson Junctions in Quantum Hall Regime Mentors Andrea Young and Fangyuan Yang (Physics)
Rex Bai

Combining superconductivity and quantum Hall effect would create topological states and excitations and it is predicted that devices achieving such state would host Majorana zero modes. However, such state is hard to achieve. Van der Waals heterostructures, which are made by laying layers of different two-dimensional materials in sequence, proved to be a good material to create these effects. In this project, we will build a device of the structure BN-graphene-BN with top and bottom gate. Then, we use lead edge contact to connect the device. The lead contact and the device will form a Josephson Junction and we can see supercurrent through it because of Josephson Effect. Since the lead edge contact is very thin, its critical field is high. Thus, we will be able to add magnetic field on the device and see superconductivity and quantum hall effect at the same time. If the experiment is successful, the Majorana zero modes we look for in the device could be used for fault-tolerant quantum computing.

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