Long tailed trions in monolayer MoS2 : Temperature dependent asymmetry and resulting red-shift of trion photoluminescence spectra

Scientific Reports
Jason W ChristopherAnna K Swan

Abstract

Monolayer molybdenum disulfide (MoS2) has emerged as a model system for studying many-body physics because the low dimensionality reduces screening leading to tightly bound states stable at room temperature. Further, the many-body states possess a pseudo-spin degree of freedom that corresponds with the two direct-gap valleys of the band structure, which can be optically manipulated. Here we focus on one bound state, the negatively charged trion. Unlike excitons, trions can radiatively decay with non-zero momentum by kicking out an electron, resulting in an asymmetric trion photoluminescence (PL) peak with a long low-energy tail and peak position that differs from the zero momentum trion energy. The asymmetry of the trion PL peak and resulting peak red-shift depends both on the trion size and a temperature-dependent contribution. Ignoring the trion asymmetry will result in over estimating the trion binding energy by nearly 20 meV at room temperature. We analyze the temperature-dependent PL to reveal the effective trion size, consistent with the literature, and the temperature dependence of the band gap and spin-orbit splitting of the valence band. This is the first time the temperature-dependence of the trion PL has been analyze...Continue Reading

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Citations

Aug 6, 2020·The Journal of Chemical Physics·Yaroslav V ZhumagulovVasili Perebeinos
Jan 31, 2021·International Journal of Molecular Sciences·Tao HanZhandong Li
Oct 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Dheeraj MondalSukhen Das
Mar 20, 2020·Nano Letters·Kyrylo GrebenKirill I Bolotin
Sep 11, 2019·ACS Applied Materials & Interfaces·Hossein ArdekaniKenan Gundogdu

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