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원자제어 저차원 전자계 연구단
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Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2

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Title
Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2
Author(s)
Sim, S; Lee, D; Noh, M; Cha, S; Soh, CH; Ji Ho Sung; Moon-Ho Jo; Choi, H
Publication Date
2016-11
Journal
NATURE COMMUNICATIONS, v.7, no., pp.13569 -
Publisher
NATURE PUBLISHING GROUP
Abstract
The optical Stark effect is a coherent light-matter interaction describing the modification of quantum states by non-resonant light illumination in atoms, solids and nanostructures. Researchers have strived to utilize this effect to control exciton states, aiming to realize ultra-high-speed optical switches and modulators. However, most studies have focused on the optical Stark effect of only the lowest exciton state due to lack of energy selectivity, resulting in low degree-of-freedom devices. Here, by applying a linearly polarized laser pulse to few-layer ReS2, where reduced symmetry leads to strong in-plane anisotropy of excitons, we control the optical Stark shift of two energetically separated exciton states. Especially, we selectively tune the Stark effect of an individual state with varying light polarization. This is possible because each state has a completely distinct dependence on light polarization due to different excitonic transition dipole moments. Our finding provides a methodology for energy-selective control of exciton states. (c) The Author(s) 2016
URI
http://pr.ibs.re.kr/handle/8788114/3093
DOI
10.1038/ncomms13569
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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