Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2

Sangwan Sim, Doeon Lee, Minji Noh, Soonyoung Cha, Chan Ho Soh, Ji Ho Sung, Moon-Ho Jo and Hyunyong Choi ()
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Sangwan Sim: School of Electrical and Electronic Engineering, Yonsei University
Doeon Lee: School of Electrical and Electronic Engineering, Yonsei University
Minji Noh: School of Electrical and Electronic Engineering, Yonsei University
Soonyoung Cha: School of Electrical and Electronic Engineering, Yonsei University
Chan Ho Soh: School of Electrical and Electronic Engineering, Yonsei University
Ji Ho Sung: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Moon-Ho Jo: Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH)
Hyunyong Choi: School of Electrical and Electronic Engineering, Yonsei University

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13569

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