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- Title
Tightly bound trions in monolayer MoS<sub>2</sub>.
- Authors
Mak, Kin Fai; He, Keliang; Lee, Changgu; Lee, Gwan Hyoung; Hone, James; Heinz, Tony F.; Shan, Jie
- 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 MoS2 is a non-centrosymmetric material with a direct energy gap. Strong photoluminescence, a current on/off ratio exceeding 108 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 MoS2 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.
- Subjects
MOLYBDENUM compounds; CRYSTALS; GRAPHENE; BAND gaps; PHOTOLUMINESCENCE; MONOMOLECULAR films; FIELD-effect transistors; QUASIPARTICLES
- Publication
Nature Materials, 2013, Vol 12, Issue 3, p207
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3505