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 journalArticlepeer-review

2291 Citations (Scopus)


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
Issue number3
Publication statusPublished - 2013 Mar

Bibliographical note

Funding Information:
This research was supported by the National Science Foundation through grants DMR-0907477 and the Research Corporation Scialog Program at Case Western Reserve University; and by the National Science Foundation through grants DMR-1106172 and 1122594 and by the Department of Energy, Office of Basic Energy Sciences through grant DE-FG02-07ER15842 at Columbia University and through grant DE-SC0001085 for optical instrumentation at Columbia University’s Center for Re-Defining Photovoltaic Efficiency through Molecule Scale Control. C.L. acknowledges support from the Korean government Ministry of Education grant Global Frontier Research Center for Advanced Soft Electronics (2011-0031629), and G.H.L. support from Samsung-SKKU Graphene Center.

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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