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원자제어 저차원 전자계 연구단
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Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2

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Title
Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2
Author(s)
Sangwan Sim; Lee, D; Trifonov, AV; Kim, T; Cha, S; Ji Ho Sung; Cho, S; Shim, W; Moon-Ho Jo; Choi, H
Publication Date
2018-01
Journal
NATURE COMMUNICATIONS, v.9, no.1, pp.351 -
Publisher
NATURE PUBLISHING GROUP
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. © The Author(s) 2018
URI
http://pr.ibs.re.kr/handle/8788114/4390
DOI
10.1038/s41467-017-02802-8
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
Files in This Item:
2018_Naturecomm.조문호(교신)_Ultrafast quantum beats of anisotropic excitons in atomically thin ReS2.pdfDownload

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