Interactive optomechanical coupling with nonlinear polaritonic systems

We study a system of interacting matter quasiparticles strongly coupled to photons inside an optomechanical cavity. The resulting normal modes of the system are represented by hybrid polaritonic quasiparticles, which acquire effective nonlinearity. Its strength is influenced by the presence of the mechanical mode and depends on the resonance frequency of the cavity. This leads to an interactive type of optomechanical coupling, being distinct from the previously studied dispersive and dissipative couplings in optomechanical systems. The emergent interactive coupling is shown to generate effective optical nonlinearity terms of high order, being quartic in the polariton number. We consider particular systems of exciton-polaritons and dipolaritons, and show that the induced effective optical nonlinearity due to the interactive coupling can exceed in magnitude the strength of Kerr nonlinear terms, such as those arising from polariton-polariton interactions. As applications, we show that the higher order terms give rise to localized bright flat top solitons, which may form spontaneously in polariton condensates.Comment: 6 pages, 3 figure

THE NATIONAL WEALTH OF THE STATE: ECOLOGICAL AND ECONOMIC CRITERIA

Introduction. An important feature of wealth is the use of economic resources necessary for organization and support of human existence. Thus, the study of structural changes in the national wealth of the country becomes urgent because of the need to introduce priority directions of preservation of the resource base, ensuring the efficiency of use, which will promote the growth of macroeconomic stability. Purpose. The purpose of the study is to substantiate the essence of the concept of “the national wealth”, generalization of processes and phenomena that have an impact on the macroeconomic stability of the state, taking into account the national wealth, its quantitative composition and qualitative content. Particularly relevant issue is the growing need to level the negative impact of globalization factors on the socio-economic development of the world states, the preservation of ecosystems. Results. The article substantiates the essence of the concept of “the national wealth” and generalizes the processes and phenomena that have an impact on the macroeconomic growth of the state, taking into account national wealth, its quantitative composition and qualitative content. It was investigated that the national wealth of the state is a set of components that provide opportunities for the development of the branches of the economy and the social sphere, support and guarantee national interests in view of the need to form a security environment, preserve the territorial integrity and mentality, the cultural heritage of the nation. The urgency of introducing measures to preserve the national wealth of the state is confirmed by the influence of globalization factors, the need to increase the competitive position in the global market. Conclusion. It is stipulated that state policy should be aimed at systematic implementation of the complex of actions that guarantee the national interests, preserve, increase the national wealth, and provide a safe economic and ecological space. The practical implementation of measures is to comply with social and ecological responsibility, fulfillment of duties by all market participants; growth of stability of development of market subjects, increase of competitive advantages; ensuring the development of territories, including through the intensification of the decentralization process; ensuring protection of the interests of citizens, preserving the traditions, mentality of the nation. Such an approach will guarantee the national security of the state, society through increased macroeconomic stability, economic stability

2s exciton-polariton revealed in an external magnetic field

We demonstrate the existence of the excited state of an exciton-polariton in a semiconductor microcavity. The strong coupling of the quantum well heavy-hole exciton in an excited 2s state to the cavity photon is observed in non-zero magnetic field due to surprisingly fast increase of Rabi energy of the 2s exciton-polariton in magnetic field. This effect is explained by a strong modification of the wave-function of the relative electron-hole motion for the 2s exciton state.Comment: 5 pages, 5 figure

Publisher Correction: Single-shot condensation of exciton polaritons and the hole burning effect

Correction to: Nature Communications https://doi.org/10.1038/s41467-018-05349-4; published online: 9 August 2018 The original PDF version of this Article had an incorrect Published online date of 25 December 2018; it should have been 9 August 2018. This has been corrected in the PDF version of the Article. The HTML version was correct from the time of publication

Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation

Bosonic condensates of exciton polaritons (light-matter quasiparticles in a semiconductor) provide a solid-state platform for studies of non-equilibrium quantum systems with a spontaneous macroscopic coherence. These driven, dissipative condensates typically coexist and interact with an incoherent reservoir, which undermines measurements of key parameters of the condensate. Here, we overcome this limitation by creating a high-density exciton-polariton condensate in an optically-induced "box" trap. In this so-called Thomas-Fermi regime, the condensate is fully separated from the reservoir and its behaviour is dominated by interparticle interactions. We use this regime to directly measure the polariton-polariton interaction strength, and reduce the existing uncertainty in its value from four orders of magnitude to within three times the theoretical prediction. The Thomas-Fermi regime has previously been demonstrated only in ultracold atomic gases in thermal equilibrium. In a non-equilibrium exciton-polariton system, this regime offers a novel opportunity to study interaction-driven effects unmasked by an incoherent reservoir.Comment: 11 pages, 5 figure

Single-shot condensation of exciton polaritons and the hole burning effect

A bosonic condensate of exciton polaritons in a semiconductor microcavity is a macroscopic quantum state subject to pumping and decay. The fundamental nature of this driven-dissipative condensate is still under debate. Here, we gain an insight into spontaneous condensation by imaging long-lifetime exciton polaritons in a high-quality inorganic microcavity in a single-shot optical excitation regime, without averaging over multiple condensate realisations. We demonstrate that condensation is strongly influenced by an incoherent reservoir and that the reservoir depletion, the so-called spatial hole burning, is critical for the transition to the ground state. Condensates of photon-like polaritons exhibit strong shot-to-shot fluctuations and density filamentation due to the effective self-focusing associated with the reservoir depletion. In contrast, condensates of exciton-like polaritons display smoother spatial density distributions and are second-order coherent. Our observations show that the single-shot measurements offer a unique opportunity to study fundamental properties of non-equilibrium condensation in the presence of a reservoir

Socialtechnological and organizational subsoil of efficiency of social dialog

Essence and pre-conditions of establishment of social dialog is examined during the decision of problem, conflict and crisis situations in public life. Formed methodical going near systematization of signs of appearance and determination of level of complication of social tension in society; the stages and steps are offered from its liquidation. As organizational basis of construction of technology of realization of social dialog the use of organizational design and construction of him is offered organizational networks