Robust trapping of 2D excitons in an engineered 1D potential from proximal ferroelectric domain walls
Abstract
We investigate the confinement of neutral excitons in a one-dimensional (1D) potential, engineered by proximizing hBN-encapsulated monolayer MoSe2 to ferroelectric domain walls (DW) in periodically poled LiNbO3. Our device exploits the nanometer scale in-plane electric field gradient at the DW to induce the dipolar exciton confinement via the Stark effect. Spatially resolved photoluminescence (PL) spectroscopy reveals the emergence of narrow emission lines redshifted from the MoSe2 neutral exciton by up to 100\,meV, depending on the sample structure. The spatial distribution, excitation energy response and polarization properties of the emission is consistent with signatures of 1D-confined excitons. The large electric field gradients accessible via proximal ferroelectric systems open up new avenues for the creation of robust quantum-confined excitons in atomically thin materials and their heterostructures.
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