Pressure evolution of electronic and structural properties in transition metal dichalcogenide 1 T -Co 1.06 Te 2 .

Two-dimensional transition metal dichalcogenides (TMDs) are important materials for promising electronic devices because they usually exhibit excellent and highly tunable electronic properties. Here, we report on the pressure-driven electronic phase transition in a TMD 1 T -Co 1.06 Te 2 . High-pressure transport measurements reveal a sign reversal of the Hall coefficients at a critical point of P C ∼ 32 GPa, evidencing a transition from hole band(s) dominated transport into one that is dominated by electron band(s). Synchrotron x-ray diffraction experiments demonstrate that no structural phase transition occurs below 46.3 GPa, indicating an electronic origin of the transition. Moreover, a kink anomaly of the lattice constant ratio c / a is also observed at P = P C . These results might indicate a Lifshitz transition which refers to a change of Fermi surface topology in absence of structural transition.