Institutional Transformations of Russia's Housing Construction Sector in 2020.

This paper shows the ongoing development of two key trends in Russia's housing construction sector: the strengthening role of the state and the formation of market leaders that control its privileged part. The latter are separated from the rest of the market by ever-deeper institutional barriers. These barriers arise due to "special" relations of such companies with the largest banks, their advantages in obtaining financing in the securities markets, better terms of interaction with development institutions, primarily JSC DOM.RF, PPK Fund for the Protection of Rights of Citizens Participating in Shared Construction, the Housing and Utilities Fund, with adequate access to the instruments of state guarantees, and other conditions provided by these institutions. It is shown that such an institutional mechanism provides the best conditions for achieving national goals in the housing sector. Conclusions are made regarding the risks and limitations in terms of achieving the goals of the National Project, Housing and Urban Environment, as well as the advisability of developing a strategy for transforming temporary anticrisis measures of state support into a long-term policy of public-private partnership and maintaining the multistructural character of the industry and market economy.

Design optimization for bright electrically-driven quantum dot single-photon sources emitting in telecom O-band.

A combination of advanced light engineering concepts enables a substantial improvement in photon extraction efficiency of micro-cavity-based single-photon sources in the telecom O-band at ∼1.3 µm. We employ a broadband bottom distributed Bragg reflector (DBR) and a top DBR formed in a dielectric micropillar with an additional circular Bragg grating in the lateral plane. This device design includes a doped layer in pin-configuration to allow for electric carrier injection. It provides broadband (∼8-10 nm) emission enhancement with an overall photon-extraction efficiency of ∼83% into the upper hemisphere and photon-extraction efficiency of ∼79% within numerical aperture NA=0.7. The efficiency of photon coupling to a single-mode fiber reaches 11% for SMF28 fiber (with NA=0.12), exceeds 22% for 980HP fiber (with NA=0.2) and reaches ∼40% for HNA fiber (with NA=0.42) as demonstrated by 3D finite-difference time-domain modeling.