Enhanced Superconductivity in Monolayer Td-MoTe2

Crystalline two-dimensional (2D) superconductors (SCs) with low carrier density are an exciting new class of materials in which electrostatic gating can tune superconductivity, electronic interactions play a prominent role, and electrical transport properties may directly reflect the topology of the Fermi surface. Here, we report the dramatic enhancement of superconductivity with decreasing thickness in semimetallic T-d-MoTe2, with critical temperature (T-c) increasing up to 7.6 K for monolayers, a 60-fold increase with respect to the bulk T-c. We show that monolayers possess a similar electronic structure and density of states (DOS) as the bulk, implying that electronic interactions play a strong role in the enhanced superconductivity. Reflecting the low carrier density, the critical temperature, magnetic field, and current density are all tunable by an applied gate voltage. The response to high in-plane magnetic fields is distinct from that of other 2D SCs and reflects the canted spin texture of the electron pockets.

Automated summary

In semimetallic T-d-MoTe2, the superconductivity is dramatically enhanced with decreasing thickness, with a critical temperature (Tc) increasing up to 7.6 K for monolayers, showing a 60-fold increase compared to bulk Tc. The response to high in-plane magnetic fields is unique compared to other 2D superconductors, reflecting the canted spin texture of the electron pockets.