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Journal Article

Tightly bound trions in monolayer MoS2

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https://doi.org/10.1038/nmat3505
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Citation

Mak, K. F., He, K., Lee, C., Lee, G. H., Hone, J., Heinz, T. F., et al. (2013). Tightly bound trions in monolayer MoS2. Nature Materials, 12(3), 207-211. doi:10.1038/nmat3505.


Cite as: https://hdl.handle.net/21.11116/0000-0010-8744-9
Abstract
Two-dimensional (2D) atomic crystals, such as graphene and transition-metal dichalcogenides, have emerged as a new class of materials with remarkable physical properties1. In contrast to graphene, monolayer MoS2 is a non-centrosymmetric material with a direct energy gap2,3,4,5. Strong photoluminescence2,3, a current on/off ratio exceeding 108 in field-effect transistors6, and efficient valley and spin control by optical helicity7,8,9 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.