Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Focus Session: Designer Quantum Systems II (joint session O/TT)

O 36.3: Talk

Tuesday, April 2, 2019, 15:00–15:15, H15

Symmetry breaking in Molecular Artificial Graphene — •Linghao Yan^1,2, Muqing Hua², Qiushi Zhang², Tsz Ue Ngai², Zesheng Guo², Tsz Chun Wu², Tong Wang², and Nian Lin² — ¹Aalto University, Finland — ²The Hong Kong University of Science and Technology, Hong Kong, China

Artificially-assembled molecular lattices on metal surfaces, known as molecular designers (Nature 483, 306, 2012), have been used as simulators to explore exciting physics that are extremely challenging to access in real materials. For example, gauge field, edge states and flat band are demonstrated in artificial grahpene, graphene nanoribbons, and Lieb lattice. In this work, we exploit the unique tunability of the molecular designers to break the symmetry of Dirac quasiparticles. The importance of symmetry breaking in graphene for applications has been widely recognized. Several schemes have been proposed, including breaking sublattice symmetry and applying uniaxial strain. Here we report the realization of both of these schemes by designing isotropic molecular potentials and isotropic lattices, respectively. The spatially-resolved local density of states acquired using scanning tunneling spectroscopy confirm that in both cases the local density of states undergo characteristic changes.