Fig. 1: Hierarchical zero- and one-dimensional topological states in symmetry–enforced grain boundaries (GB) of 1T′–MoTe2.
From: Hierarchical zero- and one-dimensional topological states in symmetry-controllable grain boundary
a Illustration of topological states in non-symmorphic and symmophic GBs. While the non-symmorphic GBs have protected edge modes, the symmorphic GBs allow atomic dimerizations, which give rise to the zero-dimensional higher-order topological states. b Schematic illustration for the GB formation process of GBs using an Scanning Tunneling Microscopy (STM) tip. Inset: Derivative STM image of pristine 1T’–MoTe2 surface showing quasi-one-dimensional chains formed by the Te atoms and denoted the region of this original chain direction as G1. c dI/dV spectra taken at the positions indicated by the black, cyan, magenta, and blue dots in the inset. Inset: STM image showing a 120° SymC2 GB created in 1T’–MoTe2. d Derivative STM image of 1T’–MoTe2 obtained after GBs formation process. e Structural models of the 1T’–MoTe2. denoted as G1, G2 and G3. The Te chain directions are marked by the dotted lines to help guide the eyes.
