Observation of Weak Anti-Localization and Electron-Electron Interaction on Few-Layer 1T′-MoTe2 Thin Films**Supported by the National Basic Research Program of China under Grant Nos 2014CB920904 and 2015CB921101, the Strategic Priority Research Program B of the Chinese Academy of Sciences under Grant No XDB07010200, and the Singapore National Research Foundation under Grant No NRF-RF2013-08.

Abstract

Electronic transports of few-layer 1T′-MoTe2 films are measured at temperatures down to 0.26 K. The low-temperature conductivity exhibits logarithmic temperature dependence and negative magneto response. The negative magnetoconductivity can be well fitted by the two-dimensional weak anti-localization theory taking a single channel of electrons into account, with the parameters α ≈ −0.5 and lϕ ∝ T−0.5. The logarithmic temperature dependence has a positive slopeκ ≈ 0.75, indicating the dominance of electron-electron interaction over the weak anti-localization effect, with an apparently negative Coulomb screening factor F that demands future work for clarification.