Tightly bound trions in monolayer MoS 2

Kin Fai Mak, Keliang He, Changgu Lee, Gwan Hyoung Lee, James Hone, Tony F. Heinz, Jie Shan

Research output: Contribution to journalArticle

1439 Citations (Scopus)

Abstract

Two-dimensional (2D) atomic crystals, such as graphene and transition-metal dichalcogenides, have emerged as a new class of materials with remarkable physical properties. In contrast to graphene, monolayer MoS 2 is a non-centrosymmetric material with a direct energy gap. Strong photoluminescence, a current on/off ratio exceeding 10 8 in field-effect transistors, and efficient valley and spin control by optical helicity have recently been demonstrated in this material. Here we report the spectroscopic identification in a monolayer MoS 2 field-effect transistor of tightly bound negative trions, a quasiparticle composed of two electrons and a hole. These quasiparticles, which can be optically created with valley and spin polarized holes, have no analogue in conventional semiconductors. They also possess a large binding energy (∼ 20 meV), rendering them significant even at room temperature. Our results open up possibilities both for fundamental studies of many-body interactions and for optoelectronic and valleytronic applications in 2D atomic crystals.

Original languageEnglish
Pages (from-to)207-211
Number of pages5
JournalNature materials
Volume12
Issue number3
DOIs
Publication statusPublished - 2013 Mar 1

All Science Journal Classification (ASJC) codes

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

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    Mak, K. F., He, K., Lee, C., Lee, G. H., Hone, J., Heinz, T. F., & Shan, J. (2013). Tightly bound trions in monolayer MoS 2. Nature materials, 12(3), 207-211. https://doi.org/10.1038/nmat3505