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The formation of interfacial moir\'e patterns from angular and/or latticemismatch has become a powerful approach to engineer a range of quantumphenomena in van der Waals heterostructures. For long-lived andvalley-polarized interlayer excitons in transition-metal dichalcogenide (TMDC)heterobilayers, signatures of quantum confinement by the moir\'e landscape havebeen reported in recent experimental studies. Such moir\'e confinement hasoffered the exciting possibility to tailor new excitonic systems, such asordered arrays of zero-dimensional (0D) quantum emitters and their couplinginto topological superlattices. A remarkable nature of the moir\'e potential isits dramatic response to strain, where a small uniaxial strain can tune thearray of quantum-dot-like 0D traps into parallel stripes of one-dimensional(1D) quantum wires. Here, we present direct evidence for the 1D moir\'epotentials from real space imaging and the corresponding 1D moir\'e excitonsfrom photoluminescence (PL) emission in MoSe2/WSe2 heterobilayers. Whereas the0D moir\'e excitons display quantum emitter-like sharp PL peaks with circularpolarization, the PL emission from 1D moir\'e excitons has linear polarizationand two orders of magnitude higher intensity. The results presented hereestablish strain engineering as a powerful new method to tailor moir\'epotentials as well as their optical and electronic responses on demand.

One-Dimensional Moir\'e Excitons in Transition-Metal Dichalcogenide Heterobilayers