Imaging anisotropic electron states in elliptical quantum dots in monolayer graphene*

Monolayer graphene (MLG) provides a unique platform for investigating relativistic quantum phenomena due to its linear band dispersion near the Dirac point. In this talk, I will present our recent experimental results on electrostatically confined elliptical quantum dots (QDs) in MLG using scanning tunneling microscopy and spectroscopy (STM/S) at low temperature. Unlike in a circular QD, electrons display anisotropic behaviors along major and minor axes in an elliptical QD, which are observed by performing STS at different points along the two axes and taking dI/dV maps with and without a perpendicular magnetic field. These findings provide more insight into building quantum devices with controllable anisotropy.