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Light Polarization-Controlled Conversion of Ultrafast Coherent-Incoherent Exciton Dynamics in Few-Layer ReS2

Title
Light Polarization-Controlled Conversion of Ultrafast Coherent-Incoherent Exciton Dynamics in Few-Layer ReS2
Author
심상완
Keywords
Ultrafast exciton dynamics; coherent light matter interaction; two-dimensional transition metal dichalcogenides; rhenium disulfide
Issue Date
2019-10
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v. 19, No. 10, Page. 7464-7469
Abstract
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://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b03173http://repository.hanyang.ac.kr/handle/20.500.11754/121270
ISSN
1530-6984; 1530-6992
DOI
10.1021/acs.nanolett.9b03173
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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