Fig. 3
From: Topological phases in pyrochlore thallium niobate Tl2Nb2O6+x
Topological properties of strained Tl2Nb2O7 with SOC on (010) surface. Structure with inplane strain of −1% (compression): a 3D Dirac point and topological surface states both appear. Bulk states and surface states near Fermi level are enlarged and shown on the right panel. b Fermi surface of surface states with energy level at −0.7 meV where Dirac points locate. Two project Dirac nodes are represented as black dots. Structure with inplane strain of 1% (expansion): c Calculated topological surface states. Bulk states and surface states near Fermi level are enlarged and shown on the right panel. d Fermi surface of surface states with energy level at −6 meV
