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

1336 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

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valleys
Monolayers
graphene
field effect transistors
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Field effect transistors
Graphene
crystals
Crystals
physical properties
binding energy
transition metals
analogs
Binding energy
photoluminescence
Optoelectronic devices
Transition metals
Photoluminescence
Energy gap
room temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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
Mak, Kin Fai ; He, Keliang ; Lee, Changgu ; Lee, Gwan Hyoung ; Hone, James ; Heinz, Tony F. ; Shan, Jie. / Tightly bound trions in monolayer MoS 2. In: Nature materials. 2013 ; Vol. 12, No. 3. pp. 207-211.
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Mak, KF, He, K, Lee, C, Lee, GH, Hone, J, Heinz, TF & Shan, J 2013, 'Tightly bound trions in monolayer MoS 2', Nature materials, vol. 12, no. 3, pp. 207-211. https://doi.org/10.1038/nmat3505

Tightly bound trions in monolayer MoS 2. / Mak, Kin Fai; He, Keliang; Lee, Changgu; Lee, Gwan Hyoung; Hone, James; Heinz, Tony F.; Shan, Jie.

In: Nature materials, Vol. 12, No. 3, 01.03.2013, p. 207-211.

Research output: Contribution to journalArticle

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Mak KF, He K, Lee C, Lee GH, Hone J, Heinz TF et al. Tightly bound trions in monolayer MoS 2. Nature materials. 2013 Mar 1;12(3):207-211. https://doi.org/10.1038/nmat3505