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 language | English |
|---|---|
| Pages (from-to) | 207-211 |
| Number of pages | 5 |
| Journal | Nature materials |
| Volume | 12 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2013 Mar 1 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
}
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 journal › Article
TY - JOUR
T1 - Tightly bound trions in monolayer MoS 2
AU - Mak, Kin Fai
AU - He, Keliang
AU - Lee, Changgu
AU - Lee, Gwan Hyoung
AU - Hone, James
AU - Heinz, Tony F.
AU - Shan, Jie
PY - 2013/3/1
Y1 - 2013/3/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84875437247&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84875437247&partnerID=8YFLogxK
U2 - 10.1038/nmat3505
DO - 10.1038/nmat3505
M3 - Article
C2 - 23202371
AN - SCOPUS:84875437247
VL - 12
SP - 207
EP - 211
JO - Nature Materials
JF - Nature Materials
SN - 1476-1122
IS - 3
ER -