Dielectric screening of excitons and trions in single-layer MoS2

Yuxuan Lin, Xi Ling, Lili Yu, Shengxi Huang, Allen L. Hsu, Yi Hsien Lee, Jing Kong, Mildred S. Dresselhaus, Tomás Palacios

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296 Scopus citations

Abstract

Photoluminescence (PL) properties of single-layer MoS2 are indicated to have strong correlations with the surrounding dielectric environment. Blue shifts of up to 40 meV of exciton or trion PL peaks were observed as a function of the dielectric constant of the environment. These results can be explained by the dielectric screening effect of the Coulomb potential; based on this, a scaling relationship was developed with the extracted electronic band gap and exciton and trion binding energies in good agreement with theoretical estimations. It was also observed that the trion/exciton intensity ratio can be tuned by at least 1 order of magnitude with different dielectric environments. Our findings are helpful to better understand the tightly bound exciton properties in strongly quantum-confined systems and provide a simple approach to the selective and separate generation of excitons or trions with potential applications in excitonic interconnects and valleytronics.

Original languageEnglish (US)
Pages (from-to)5569-5576
Number of pages8
JournalNano letters
Volume14
Issue number10
DOIs
StatePublished - Oct 8 2014

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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    Lin, Y., Ling, X., Yu, L., Huang, S., Hsu, A. L., Lee, Y. H., Kong, J., Dresselhaus, M. S., & Palacios, T. (2014). Dielectric screening of excitons and trions in single-layer MoS2. Nano letters, 14(10), 5569-5576. https://doi.org/10.1021/nl501988y