Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2

Sangwan Sim, Doeon Lee, Artur V. Trifonov, Taeyoung Kim, Soonyoung Cha, Ji Ho Sung, Sungjun Cho, Wooyoung Shim, Moon Ho Jo, Hyunyong Choi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Quantum beats, periodic oscillations arising from coherent superposition states, have enabled exploration of novel coherent phenomena. Originating from strong Coulomb interactions and reduced dielectric screening, two-dimensional transition metal dichalcogenides exhibit strongly bound excitons either in a single structure or hetero-counterpart; however, quantum coherence between excitons is barely known to date. Here we observe exciton quantum beats in atomically thin ReS2 and further modulate the intensity of the quantum beats signal. Surprisingly, linearly polarized excitons behave like a coherently coupled three-level system exhibiting quantum beats, even though they exhibit anisotropic exciton orientations and optical selection rules. Theoretical studies are also provided to clarify that the observed quantum beats originate from pure quantum coherence, not from classical interference. Furthermore, we modulate on/off quantum beats only by laser polarization. This work provides an ideal laboratory toward polarization-controlled exciton quantum beats in two-dimensional materials.

Original languageEnglish
Article number351
JournalNature communications
Volume9
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

Fingerprint

synchronism
excitons
Polarization
Coulomb interactions
polarization
Transition metals
LDS 751
rhenium sulfide
Screening
Lasers
Theoretical Models
Metals
screening
transition metals
interference
oscillations
lasers
interactions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Sim, S., Lee, D., Trifonov, A. V., Kim, T., Cha, S., Sung, J. H., ... Choi, H. (2018). Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2 Nature communications, 9(1), [351]. https://doi.org/10.1038/s41467-017-02802-8
Sim, Sangwan ; Lee, Doeon ; Trifonov, Artur V. ; Kim, Taeyoung ; Cha, Soonyoung ; Sung, Ji Ho ; Cho, Sungjun ; Shim, Wooyoung ; Jo, Moon Ho ; Choi, Hyunyong. / Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2 In: Nature communications. 2018 ; Vol. 9, No. 1.
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Sim, S, Lee, D, Trifonov, AV, Kim, T, Cha, S, Sung, JH, Cho, S, Shim, W, Jo, MH & Choi, H 2018, 'Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2 ', Nature communications, vol. 9, no. 1, 351. https://doi.org/10.1038/s41467-017-02802-8

Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2 . / Sim, Sangwan; Lee, Doeon; Trifonov, Artur V.; Kim, Taeyoung; Cha, Soonyoung; Sung, Ji Ho; Cho, Sungjun; Shim, Wooyoung; Jo, Moon Ho; Choi, Hyunyong.

In: Nature communications, Vol. 9, No. 1, 351, 01.12.2018.

Research output: Contribution to journalArticle

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AU - Lee, Doeon

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AU - Sung, Ji Ho

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AU - Choi, Hyunyong

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