Chiral Superconductivity from Spin Polarized Chern Band in Twisted MoTe_{2}

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Materials

Background:

• Superconductivity observed in twisted bilayer molybdenum ditelluride (MoTe2).
• The material exhibits an anomalous Hall metal parent state.
• Key signatures suggest chiral superconductivity driven by intravalley electron pairing.

Purpose of the Study:

• Investigate the mechanism of superconductivity in twisted MoTe2.
• Compute the superconducting phase diagram using a realistic model.
• Clarify the role of band topology in achieving topological superconductivity.

Main Methods:

• Kohn-Luttinger mechanism applied to compute the superconducting phase diagram.
• Random Phase Approximation (RPA) used to incorporate Coulomb repulsion.
• Realistic continuum model of twisted MoTe2.

Main Results:

• Identified dominant intravalley pairing leading to p+ip type superconductivity.
• Observed a narrow superconducting dome at zero gating field.
• Contrasted chiral intravalley pairing with weaker time-reversal-symmetric intervalley pairing at finite gating fields.

Conclusions:

• The study reveals the chiral and topological nature of superconductivity in twisted MoTe2.
• Band topology plays a crucial role in achieving topological superconductivity.
• The findings highlight the potential of twisted MoTe2 as a platform for topological superconductivity.