Exciton-dominated dielectric function of atomically thin MoS2 films
Abstract
We systematically measure the dielectric function of atomically thin MoS2 films with different layer numbers and demonstrate that excitonic effects play a dominant role in the dielectric function when the films are less than 5–7 layers thick. The dielectric function shows an anomalous dependence on the layer number. It decreases with the layer number increasing when the films are less than 5–7 layers thick but turns to increase with the layer number for thicker films. We show that this is because the excitonic effect is very strong in the thin MoS2 films and its contribution to the dielectric function may dominate over the contribution of the band structure. We also extract the value of layer-dependent exciton binding energy and Bohr radius in the films by fitting the experimental results with an intuitive model. The dominance of excitonic effects is in stark contrast with what reported at conventional materials whose dielectric functions are usually dictated by band structures. Lastly, the knowledge of the dielectric function may enable capabilities to engineer the light-matter interactions of atomically thin MoS2 films for the development of novel photonic devices, such as metamaterials, waveguides, light absorbers, and light emitters.
- Authors:
-
- North Carolina State Univ., Raleigh, NC (United States)
- Institute of High Performance Computing, A*STAR (Singapore)
- National Institute of Standards and Technology, Gaithersburg, MD (United States)
- Univ. of California, Santa Barbara, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1241023
- Grant/Contract Number:
- FG02-07ER46434
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; optics and photonics; two-dimensional materials
Citation Formats
Yu, Yiling, Yu, Yifei, Cai, Yongqing, Li, Wei, Gurarslan, Alper, Peelaers, Hartwin, Aspnes, David E., Van de Walle, Chris G., Nguyen, Nhan V., Zhang, Yong -Wei, and Cao, Linyou. Exciton-dominated dielectric function of atomically thin MoS2 films. United States: N. p., 2015.
Web. doi:10.1038/srep16996.
Yu, Yiling, Yu, Yifei, Cai, Yongqing, Li, Wei, Gurarslan, Alper, Peelaers, Hartwin, Aspnes, David E., Van de Walle, Chris G., Nguyen, Nhan V., Zhang, Yong -Wei, & Cao, Linyou. Exciton-dominated dielectric function of atomically thin MoS2 films. United States. https://doi.org/10.1038/srep16996
Yu, Yiling, Yu, Yifei, Cai, Yongqing, Li, Wei, Gurarslan, Alper, Peelaers, Hartwin, Aspnes, David E., Van de Walle, Chris G., Nguyen, Nhan V., Zhang, Yong -Wei, and Cao, Linyou. Tue .
"Exciton-dominated dielectric function of atomically thin MoS2 films". United States. https://doi.org/10.1038/srep16996. https://www.osti.gov/servlets/purl/1241023.
@article{osti_1241023,
title = {Exciton-dominated dielectric function of atomically thin MoS2 films},
author = {Yu, Yiling and Yu, Yifei and Cai, Yongqing and Li, Wei and Gurarslan, Alper and Peelaers, Hartwin and Aspnes, David E. and Van de Walle, Chris G. and Nguyen, Nhan V. and Zhang, Yong -Wei and Cao, Linyou},
abstractNote = {We systematically measure the dielectric function of atomically thin MoS2 films with different layer numbers and demonstrate that excitonic effects play a dominant role in the dielectric function when the films are less than 5–7 layers thick. The dielectric function shows an anomalous dependence on the layer number. It decreases with the layer number increasing when the films are less than 5–7 layers thick but turns to increase with the layer number for thicker films. We show that this is because the excitonic effect is very strong in the thin MoS2 films and its contribution to the dielectric function may dominate over the contribution of the band structure. We also extract the value of layer-dependent exciton binding energy and Bohr radius in the films by fitting the experimental results with an intuitive model. The dominance of excitonic effects is in stark contrast with what reported at conventional materials whose dielectric functions are usually dictated by band structures. Lastly, the knowledge of the dielectric function may enable capabilities to engineer the light-matter interactions of atomically thin MoS2 films for the development of novel photonic devices, such as metamaterials, waveguides, light absorbers, and light emitters.},
doi = {10.1038/srep16996},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Tue Nov 24 00:00:00 EST 2015},
month = {Tue Nov 24 00:00:00 EST 2015}
}
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