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Electrostatically defined quantum dots (QDs) in Bernal stacked bilayergraphene (BLG) are a promising quantum information platform because of theirlong spin decoherence times, high sample quality, and tunability. Importantly,the shape of QD states determines the electron energy spectrum, theinteractions between electrons, and the coupling of electrons to theirenvironment, all of which are relevant for quantum information processing.Despite its importance, the shape of BLG QD states remains experimentallyunexamined. Here we report direct visualization of BLG QD states by using ascanning tunneling microscope. Strikingly, we find these states exhibit arobust broken rotational symmetry. By using a numerical tight-binding model, wedetermine that the observed broken rotational symmetry can be attributed to lowenergy anisotropic bands. We then compare confined holes and electrons anddemonstrate the influence of BLG's nontrivial band topology. Our studydistinguishes BLG QDs from prior QD platforms with trivial band topology.

Visualization and Manipulation of Bilayer Graphene Quantum Dots with Broken Rotational Symmetry and Nontrivial Topology