Abstract
Stanene was grown on two substrates (Bi2Te3 and Sb2Te3) with different in-plane lattice constants by molecular beam epitaxy under ultrahigh vacuum conditions, and the electronic structure tuned by the lattice constant of the substrate was investigated by in situ angle-resolved photoemission spectroscopy. The metallic surface state of stanene on Bi2Te3 is characterized by an upward cone-like structure with a strong warping effect. Compared with the anisotropic Fermi surface of stanene on Bi2Te3 modified by the hexagonal in-plane crystal field, the band dispersion of stanene on Sb2Te3 steepens which is caused by the smaller in-plane lattice parameter, and the anisotropy of the Fermi surface evolves into quasi-isotropy. Band evolution, bandgap, and anisotropic effects of stanene are initially associated with the structural symmetry and lattice parameter, and this phenomenon can be used as a general rule extended to other similar low dimensional systems.
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