Synthesis and Photophysical Analysis of Chiroptical Quasi-Epitaxial Heterostructure
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As Moore's law approaches its theoretical limits, next-generation electronics now focuses on boosting the information density. In this regard, the recent discovery of "pseudospin" in the “valley” structure of two-dimensional transition metal dichalcogenides (TMDCs) can provide a new avenue, which calls for new methods triggering efficient valley polarizations. Here, we present a novel approach for selective valley polarization and pseudospin control in TMDCs through quasi-epitaxial heterostructures with chiroptical materials. The heterostructure was formed by self-assembling chiral materials onto a single layer of TMDCs using a vapor diffusion method. Circular dichroism and time-resolved spectroscopy demonstrated precise control over the valley degree of freedom, enabling efficient multi-level optical signal processing. This method advances valley polarization control in opto-valleytronics for quantum information processing.