Fig. 4
From: Polar and phase domain walls with conducting interfacial states in a Weyl semimetal MoTe2
Polar domain and domain wall kinetics under e− beam along plane views at 80 K. a DF-image of two Td domains with bright and dark contrasts. b The immediate DF-TEM image of the same area after exposure to a focused e− beam, showing DW motion accompanying the shrinkage of the dark-contrast Td↓ domain. Scale bar, 500 nm. c Sequential snapshots obtained from the in-situ video, revealing representative polar DW motions after exposure to a focused e− beam. Four visible DWs are outlined in purple, red, green and blue, which represent the DWs between gradient domains of different Td↑/Td↓ volume fractions along the c axis. The Td↑ dominated (purple-shaded) domain is favored and expanded under electron beam while the Td↓ dominated (blue-shaded) domain has shrunk. Scale bar, 500 nm. d The potential energy surface as a function of the normalized interlayer displacement (λ) and b–c cell angle. The color scale denotes energy with respect to the high-energy peak T0 phase. e The energy profile from the Td↓ to Td↑ transition along the lowest energy path-3. f The family tree of the crystallographic group-subgroup relation. g The schematic model of a Td↑ and Td↓ junction along the c axis, containing one 1T´ unit as bridge. Blue dashed lines mark the phase domain walls
