SFB 1238 | March 06, 09:00
2D Materials: Platform for Creating and Manipulating Correlations and Topology
Being able to create and govern new phases of matter is one of the most fascinating aspects of condensed matter physics. In particular, it has been proposed that by leveraging correlations and topology, new types of quasiparticles can emerge that follow entirely new rules—namely, non-Abelian anyons, which might serve as building blocks for fault-tolerant qubits.
I will first show how correlations and topology can be combined in rhombohedral multilayer graphene aligned with hexagonal boron nitride. We have shown that this system can be tuned into either a superconducting (SC) or a quantum anomalous Hall (QAH) phase simply by applying an electric field, opening a pathway toward topological devices based on SC–QAH hybrid platforms [1].
Then, by leveraging atomic force microscope–based, ultra-clean and ultra-precise nanofabrication on van der Waals materials, I will show how to control and confine single quasiparticles in the integer quantum Hall regime of monolayer graphene, and how to study fractional quantum Hall dots by investigating different edge–quantum-dot coupling regimes, opening new opportunities for the controlled detection and manipulation of Abelian even-denominator quantum Hall states.
Finally, I will outline how correlations and topology can be harnessed to engineer novel nanoelectronic devices—beyond topological qubits—including quantum Hall–protected qubits and high-impedance, magnetic-field-resilient quantum couplers.
1 Y. Choi*, Y. Choi*, MV* et al. Nature 342 Vol 639 (2025).
University of California Santa Barbara (UCSB)
PH2
Contact: Erwann Bocquillon / Matteo Cacco