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원자제어 저차원 전자계 연구단
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Light polarization-controlled conversion of ultrafast coherent-incoherent exciton dynamics in Few-Layer ReS2

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Title
Light polarization-controlled conversion of ultrafast coherent-incoherent exciton dynamics in Few-Layer ReS2
Author(s)
Sim S.; Lee D.; Lee J.; Bae H.; Noh M.; Soonyoung Cha; Moon-Ho Jo; Lee K.; Choi H.
Publication Date
2019-10
Journal
NANO LETTERS, v.19, no.10, pp.7464 - 7469
Publisher
AMER CHEMICAL SOC
Abstract
Copyright © 2019 American Chemical Society.Coherent light-matter interaction can transiently modulate the quantum states of matter under nonresonant laser excitation. This phenomenon, called the optical Stark effect, is one of the promising candidates for realizing ultrafast optical switches. However, the ultrafast modulations induced by the coherent light-matter interactions usually involve unwanted incoherent responses, significantly reducing the overall operation speed. Here, by using ultrafast pump-probe spectroscopy, we suppress the incoherent response and modulate the coherent-To-incoherent ratio in the two-dimensional semiconductor ReS2. We selectively convert the coherent and incoherent responses of an anisotropic exciton state by solely using photon polarizations, improving the control ratio by 3 orders of magnitude. The efficient modulation was enabled by transient superpositions of differential spectra from two nondegenerate exciton states due to the light polarization dependencies. This work provides a valuable contribution toward realizing ideal ultrafast optical switches.
URI
https://pr.ibs.re.kr/handle/8788114/6413
ISSN
1530-6984
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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