Valley-selective optical Stark effect of exciton-polaritons in a monolayer semiconductor

LaMountain, Trevor; Nelson, Jovan; Lenferink, Erik J.; Amsterdam, Samuel H.; Murthy, Akshay A.; Marks, Tobin J.; Dravid, Vinayak P.; Hersam, Mark C.; Stern, Nathaniel P.

doi:10.1038/s41467-021-24764-8

Cited by 34 publications

(26 citation statements)

References 38 publications

(67 reference statements)

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“…S23 suggest that PHET is not a prominent process in our results. Moreover, the possible influences from the valley-selective resonant optical Stark effect in TMD-based plexcitons can also be eliminated, as the pump and probe beams are cross-circularly polarized 68 , 69 .…”

Section: Discussionmentioning

confidence: 99%

Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor

et al. 2022

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Searching for ideal materials with strong effective optical nonlinear responses is a long-term task enabling remarkable breakthroughs in contemporary quantum and nonlinear optics. Polaritons, hybridized light-matter quasiparticles, are an appealing candidate to realize such nonlinearities. Here, we explore a class of peculiar polaritons, named plasmon–exciton polaritons (plexcitons), in a hybrid system composed of silver nanodisk arrays and monolayer tungsten-disulfide (WS2), which shows giant room-temperature nonlinearity due to their deep-subwavelength localized nature. Specifically, comprehensive ultrafast pump–probe measurements reveal that plexciton nonlinearity is dominated by the saturation and higher-order excitation-induced dephasing interactions, rather than the well-known exchange interaction in traditional microcavity polaritons. Furthermore, we demonstrate this giant nonlinearity can be exploited to manipulate the ultrafast nonlinear absorption properties of the solid-state system. Our findings suggest that plexcitons are intrinsically strongly interacting, thereby pioneering new horizons for practical implementations such as energy-efficient ultrafast all-optical switching and information processing.

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Section: Discussionmentioning

confidence: 99%

Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor

et al. 2022

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“…Another important result has been obtained by LaMountain et al [353] that demonstrated the valley-selective optical Stark effect in a WS 2 monolayer planar microcavity at room temperature. The authors used an ultrafast pump-probe technique in which the pump is detuned ≈520 meV (redshifted) with respect to the polariton modes, and the probe is used to monitor the energy shift of both UP and LP branches.…”

Section: Valley Polarization In Tmd Microcavitiesmentioning

confidence: 70%

“…The pump has circular polarization, σ, while the probe is switched in either σ or σ−, as shown in Fig. 11 valley-selective shift of highly detuned polaritons at room temperature [353] .…”

Section: Valley Polarization In Tmd Microcavitiesmentioning

confidence: 99%

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Microcavity exciton polaritons at room temperature

Ghosh

Zhao

et al. 2022

Photonics Insights

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The quest for realizing novel fundamental physical effects and practical applications in ambient conditions has led to tremendous interest in microcavity exciton polaritons working in the strong coupling regime at room temperature. In the past few decades, a wide range of novel semiconductor systems supporting robust exciton polaritons have emerged, which has led to the realization of various fascinating phenomena and practical applications. This paper aims to review recent theoretical and experimental developments of exciton polaritons operating at room temperature, and includes a comprehensive theoretical background, descriptions of intriguing phenomena observed in various physical systems, as well as accounts of optoelectronic applications. Specifically, an in-depth review of physical systems achieving room temperature exciton polaritons will be presented, including the early development of ZnO and GaN microcavities and other emerging systems such as organics, halide perovskite semiconductors, carbon nanotubes, and transition metal dichalcogenides. Finally, a perspective of outlooking future developments will be elaborated.

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“…Laser-field manipulation of electronic band structure is at the frontier of quantum-materials research [1]. In particular, monolayer transition-metal dichalcogenides (TMDs) exhibit remarkable excitonic properties as a result of their reduced dimensionality [2], and recent spectroscopic studies have shown their promising potential toward novel optoelectronic devices [4][5][6][7][8][9][10][11][12][13]. One of the common approaches is to coherently drive the interband transition by a near-resonant visible pulse and induce an AC-Stark shift to the exciton resonance [4,5].…”

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confidence: 99%