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

Author

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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)
    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)
    Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

  • Hyunyong Choi

    (School of Electrical and Electronic Engineering, Yonsei University)

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.

Suggested Citation

  • Sangwan Sim & Doeon Lee & Minji Noh & Soonyoung Cha & Chan Ho Soh & Ji Ho Sung & Moon-Ho Jo & Hyunyong Choi, 2016. "Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13569
    DOI: 10.1038/ncomms13569
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    Cited by:

    1. Yuxuan Li & Yaoyao Han & Wenfei Liang & Boyu Zhang & Yulu Li & Yuan Liu & Yupeng Yang & Kaifeng Wu & Jingyi Zhu, 2022. "Excitonic Bloch–Siegert shift in CsPbI3 perovskite quantum dots," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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