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The electron-hole exchange interaction is a fundamental mechanism that drivesvalley depolarization via intervalley exciton hopping in semiconductormulti-valley systems. Here, we report polarization-resolved photoluminescencespectroscopy of neutral excitons and negatively charged trions in monolayerMoSe$_2$ and WSe$_2$ under biaxial strain. We observe a markedenhancement(reduction) on the WSe$_2$ triplet trion valley polarization withcompressive(tensile) strain while the trion in MoSe$_2$ is unaffected. Theorigin of this effect is shown to be a strain dependent tuning of theelectron-hole exchange interaction. A combined analysis of the strain dependentpolarization degree using ab initio calculations and rate equations shows thatstrain affects intervalley scattering beyond what is expected from straindependent bandgap modulations. The results evidence how strain can be used totune valley physics in energetically degenerate multi-valley systems.

Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides