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  • Title: Population pulsation resonances of excitons in monolayer MoSe2 with sub-1  μeV linewidths.
    Author: Schaibley JR, Karin T, Yu H, Ross JS, Rivera P, Jones AM, Scott ME, Yan J, Mandrus DG, Yao W, Fu KM, Xu X.
    Journal: Phys Rev Lett; 2015 Apr 03; 114(13):137402. PubMed ID: 25884137.
    Abstract:
    Monolayer transition metal dichalcogenides, a new class of atomically thin semiconductors, possess optically coupled 2D valley excitons. The nature of exciton relaxation in these systems is currently poorly understood. Here, we investigate exciton relaxation in monolayer MoSe_{2} using polarization-resolved coherent nonlinear optical spectroscopy with high spectral resolution. We report strikingly narrow population pulsation resonances with two different characteristic linewidths of 1 and <0.2  μeV at low temperature. These linewidths are more than 3 orders of magnitude narrower than the photoluminescence and absorption linewidth, and indicate that a component of the exciton relaxation dynamics occurs on time scales longer than 1 ns. The ultranarrow resonance (<0.2  μeV) emerges with increasing excitation intensity, and implies the existence of a long-lived state whose lifetime exceeds 6 ns.
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