Title | Tightly bound trions in monolayer MoS2. |
Publication Type | Journal Article |
Year of Publication | 2013 |
Authors | Mak, KFai, He, K, Lee, C, Lee, GHyoung, Hone, J, Heinz, TF, Shan, J |
Journal | Nat Mater |
Volume | 12 |
Issue | 3 |
Pagination | 207-11 |
Date Published | 2013 Mar |
ISSN | 1476-1122 |
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. |
DOI | 10.1038/nmat3505 |
Alternate Journal | Nat Mater |
PubMed ID | 23202371 |