Polariton Microcavities Based on Transition Metal Dichalcogenides (TMDCs) monolayers

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Description

A variety of thin-film periodic microcavity systems have been studied and used in fundamental research over the years [1-3] thus eventually becoming a common building material for working with quantum confined systems. Transition metal dichalcogenide crystals (TMDCs) monolayers embedded into high-quality factor microcavities have recently emerged as perspectively new structures for fundamental research in solid-state-based quantum electrodynamics. In these structures excitons feature a giant oscillator strength, that leads to absorption up to 20% per monolayer [4], and the binding energy of few hundred meV resulting in eminent stability at elevated temperatures and revealing strong excitonic features within the visible and near infrared spectral range. It has been shown that high-quality factor microcavity allows such system for strong exciton-photon coupling regime and thus forming exciton-polaritons [5, 6].
Though strong non-linearities have been thoroughly studied over recent years [7, 8], ones of the most interesting effects, in particular, bosonic condensation and spontaneous coherence of many-particle complexes have not been addressed to a sufficient degree. Studies of bosonic many-body excitations in solids [9] reveal that exciton-polaritons are capable of forming non-equilibrium condensates at relatively high temperatures. Moreover, taking into consideration the properties of TMDCs microcavities such structures establish a great and convenient platform for further fundamental studies and potential applications in integrated photonics and as innovative light sources [10]. Recently, the group of Prof. C. Schneider have reported the strong evidence considering bosonic condensation of exciton-polaritons in this system at the temperature of 4 K [11] that shows great possibilities in observation of spatially and temporally coherent valley condensates at near room temperatures.

References:

[1] Kavokin A., Baumberg J. J., Malpuech G. and Laussy F. P. Microcavities. ISBN: 9780191711190 (2008) // doi: 10.1093/acprof:oso/9780199228942.001.0001
[2] Savona V. The Physics of Semiconductor Microcavities: From Fundamentals to Nanoscale Devices. Weinheim: Wiley. p. 1-30 (2007)
[3] Mitryakhin V.N., Shapochkin P. Yu., Lozhkin M. S., Hatzopoulos Z., Tzimis A., Savvidis P. and Kapitonov Yu V. Anticrossing of optical modes in coupled microcavities. J. Phys. Conf. Ser. 1400(6) [066032] (2019).
[4] Li Y., et al. Measurement of the optical dielectric function of monolayer transition-metal dichalcogenides: MoS2, MoSe2, WS2, and WSe2. Phys. Rev. B 90, 205422 (2014).
[5] Liu X., Galfsky T., Sun Z., Xia F., Lin E., Lee Y-H., Kéna-Cohen S. and Menon V. M. Strong light–matter coupling in two-dimensional atomic crystals, Nature Photonics, 9, 30-34 (2015)
[6] Schneider C., Glazov M. M., Korn T., Höfling S. and Urbaszek B. Two-dimensional semiconductors in the regime of strong light-matter coupling. Nat Commun 9, 2695 (2018).
[7] Flatten L. C., et al. Room-temperature exciton-polaritons with two-dimensional WS2. Sci Rep 6, 33134 (2016)
[8] Wang G., et al. Colloquium: Excitons in atomically thin transition metal dichalcogenides. Rev. Mod. Phys. 90, 021001 (2018)
[9] Kasprzak J., et al. Bose–Einstein condensation of exciton polaritons. Nature 443, 409– 414 (2006).
[10] Imamoglu A., Ram R. J., Pau S. and Yamamoto Y. Nonequilibrium condensates and lasers without inversion: Exciton-polariton lasers. Physical Review A 53, 4250–4253 (1996).
[11] Anton-Solanas C., Waldherr M., Klaas M., Suchomel H., Cai H., Sedov E., Kavokin A., Tongay S., Watanabe K., Taniguchi T., Höfling S. and Schneider C. Bosonic condensation of exciton-polaritons in an atomically thin crystal. Preprint // https://arxiv.org/abs/2009.11885 (2020)

AcronymGRISC 2021_1
StatusNot started