Population pulsation resonances of excitons in monolayer MoSe2 with Sub- 1μeV linewidths

John R. Schaibley, Todd Karin, Hongyi Yu, Jason S. Ross, Pasqual Rivera, Aaron M. Jones, Marie E. Scott, Jiaqiang Yan, D. G. Mandrus, Wang Yao, Kai Mei Fu, Xiaodong Xu

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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 MoSe2 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 <0.2μeV 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 (<0.2μeV) emerges with increasing excitation intensity, and implies the existence of a long-lived state whose lifetime exceeds 6 ns.

Original languageEnglish (US)
Article number137402
JournalPhysical review letters
Volume114
Issue number13
DOIs
StatePublished - Apr 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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