Quantum Dot Moiré from Crossed MoS2 Nanoribbons

Twisted atomically thin layers have attracted much attention for Moir\'e potential and correlated quantum phenomena. However, existing Moir\'e superlattices have largely been limited to extensive wavefunction without lateral confinement. Here we introduce a new platform where 1D nanoribbons of 2D MoS2 grown by vapor deposition can be easily superposed at various angles from stacking and transferring, to form Moir\'e quantum dots at their intersections with unique exciton physics. Angle-dependent Moir\'e intersections show enhanced exciton emission at commensurate angle 22 deg, which demonstrates faster relaxation at the cryogenic temperature. A size-dependent study further exhibits a reduced exciton energy and soften out-of-plane interlayer coupling for smaller Moir\'e areas. Our results reveal exciton physics turnability via precise overlapping of 1D nanoribbons.