Near Perfect Particle-Hole Symmetry in Graphene Quantum Dots

Under the umbrella of JARA Researchers at RWTH Aachen University and Forschungszentrum Jülich have uncovered important characteristics of double quantum dots in bilayer graphene, an increasingly promising material for possible applications in quantum technologies. The team has demonstrated near-perfect particle-hole symmetry in graphene quantum dots, which could lead to more efficient quantum information processing. The study has been published in Nature.  

Double quantum dots have been extensively studied in standard semiconductor platforms such as gallium arsenide, silicon or silicon germanium, as they provide a convenient solid-state platform for encoding quantum information. The 2D Materials and Quantum Devices Group at RWTH Aachen University has now shown that double quantum dots in bilayer graphene have more to offer than in other materials: they allow the realization of systems with near-perfect particle-hole symmetry, where transport occurs via the creation and annihilation of single electron-hole pairs with opposite quantum numbers. This results in strong selection rules that can be used for high-fidelity readout schemes of spin and valley qubits.

Press release on the Website of RWTH Aachen UNiversity: https://www.rwth-aachen.de/cms/root/Die-RWTH/Aktuell/Pressemitteilungen/Mai-2023/~bbnysf/Graphen-Quantenpunkte-mit-nahezu-perfekt/?lidx=1

Press release of Forschungszentrum Jülich: https://www.fz-juelich.de/de/aktuelles/news/highlights/2023/symmetrische-graphen-quantenpunkte-fuer-zukuenftige-qubits (german)

Original publication in the journal nature: https://www.nature.com/articles/s41586-023-05953-5