Optical activity in chiral stacks of 2D semiconductors

Poshakinskiy, A. V.; Kazanov, D. R.; Shubina, T. V.; Tarasenko, S. A.

doi:10.1515/nanoph-2017-0114

Cited by 17 publications

(13 citation statements)

References 44 publications

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“…Second, both from fundamental and practical viewpoints studies of chirality effects for excitons in two-dimensional materials interacting with light are very promising in view of recent predictions of substantial natural optical activity in TMDC MLs stacks 110 . Furthermore, realizations of combined systems with TMDC MLs embedded in chiral cavities open up possibilities of realizing room temperature circularly polarized lasing 111 .…”

Section: Discussionmentioning

confidence: 99%

Two-dimensional semiconductors in the regime of strong light-matter coupling

et al. 2018

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The optical properties of transition metal dichalcogenide monolayers are widely dominated by excitons, Coulomb-bound electron–hole pairs. These quasi-particles exhibit giant oscillator strength and give rise to narrow-band, well-pronounced optical transitions, which can be brought into resonance with electromagnetic fields in microcavities and plasmonic nanostructures. Due to the atomic thinness and robustness of the monolayers, their integration in van der Waals heterostructures provides unique opportunities for engineering strong light-matter coupling. We review first results in this emerging field and outline future opportunities and challenges.

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Section: Discussionmentioning

confidence: 99%

Two-dimensional semiconductors in the regime of strong light-matter coupling

et al. 2018

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“…In particular, a quasi‐resonant excitation and strain in NTs can markedly change the ratio between the direct and indirect excitonic transitions. We cannot also ignore such effects as interlayer coupling and exciton tunneling in chiral structures …”

Section: Luminescence Emerging From Tmd Nanotubesmentioning

confidence: 99%

Excitonic Emission in van der Waals Nanotubes of Transition Metal Dichalcogenides

et al. 2019

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Nanotubes (NTs) of transition metal dichalcogenides (TMDs), were first synthesized more than a quarter of a century ago; nevertheless, many of their optical properties have so far remained basically unknown. Herein, the state of the art in the knowledge of the optical properties of TMD NTs is presented. First, general properties of multilayered crystals are evaluated, and available data on related NTs are analyzed. Then, the technology for the formation and the structural characteristics of NTs are represented, focusing on the structures synthesized by chemical transport reaction. The core of this work is the presentation of the ability of synthesized TMD NTs to emit bright photoluminescence (PL), which has been discovered recently. By means of micro-PL spectroscopy of individual tubes, we show that excitonic transitions relevant to both direct and indirect band gaps contribute to the emission spectra of the NTs despite having the dozens of monolayers in their walls. The performance of the tubes as efficient optical resonators is highlighted, where confined optical modes strongly affect the emission. Finally, a brief conclusion is presented, along with an outlook of the future studies of this novel radiative member of the NTs family, which have unique potential for different nanophotonics applications.

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“…The OA can arise from the presence of chirality at different scales: from the structure of single molecules or crystal unit cells 32 , 33 , from the stacking of monolayers 34 , or, finally, at the macroscopic scale of the structure as a whole. The latter configuration has been demonstrated recently in a cavity exhibiting a degeneracy of orthogonally polarized modes of opposite parity 35 , as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Nontrivial band geometry in an optically active system

Ren

Liao

et al. 2021

Nat Commun

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Optical activity, also called circular birefringence, is known for two hundred years, but its applications for topological photonics remain unexplored. Unlike the Faraday effect, the optical activity provokes rotation of the linear polarization of light without magnetic effects, thus preserving the time-reversal symmetry. In this work, we report a direct measurement of the Berry curvature and quantum metric of the photonic modes of a planar cavity, containing a birefringent organic microcrystal (perylene) and exhibiting emergent optical activity. This experiment, performed at room temperature and at visible wavelength, establishes the potential of organic materials for implementing non-magnetic and low-cost topological photonic devices.

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Optical activity in chiral stacks of 2D semiconductors

Cited by 17 publications

References 44 publications

Two-dimensional semiconductors in the regime of strong light-matter coupling

Two-dimensional semiconductors in the regime of strong light-matter coupling

Excitonic Emission in van der Waals Nanotubes of Transition Metal Dichalcogenides

Nontrivial band geometry in an optically active system

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