2023 Scientific Results Summed Up by the Centre of Quantum Metamaterials.
Centre's Researchers have published 12 Articles in Q1 journals, including Nature Physics and Physical Review Letters. The research results were presented at 3 international scientific conferences.
1. The research has been carried out in the following major directions: optical and dynamic properties of 2D and 0D semiconductor structures (monolayers and quantum dots), and studying the role of the reduced dimensionality in shaping properties of quantum superconducting condensates.
2. A theoretical analysis of three-particle states in monolayers of transition metal dichalcogenides (TMDC) has been carried out. The dependence of the low-energy fine structure of trions on the band structure, doping, and dielectric medium has been investigated.
3. The polariton states for monolayers of chromium trihalides have been analyzed, and the prospects for their applications investigated. A microscopic theory has been developed to describe exciton–polaritons in CrI3 magnetic monolayers placed in optical microcavities.
4. Calculations of the nonlinear quantum dynamics of exciton states in TMDC monolayers driven by high-intensity laser pulses have been carried out. The results showed significant alterations in the second harmonic signal due to the influence of many-particle exciton states.
5. A new method for calculating the dynamics of open quantum systems coupled with an arbitrary external excitation bath has been developed and implemented.
6. Our studies have proved that the two-photon pumping scheme used to create the biexciton and entangled photon pairs has a fundamental limit on the achievable entanglement, which cannot be improved.
7. The scattering of light on a surface of an electrically conducting system has been studied. It has been shown that the generation of plasmons in the scattering process leads to an increased absorption of the scattered light due to the super-anomalous skin effect in metals.
8. An experimental and theoretical study of the dynamics of vortex matter in Nb intertype superconductor have been carried out. It has been shown that the initial configuration of isotropically distributed vortex clusters is rapidly rearranged under the influence of the supercurrent, stretching in a direction perpendicular to the current flow, eventually reaching a stable configuration of parallel vortex stripes.
9. An analysis of the superconducting properties of disordered samples in the presence of spatial correlations of impurity disorder has been carried out. It showed a significant role of such correlations, which affect both local and global superconducting characteristics.
10. Superconducting fluctuations in two-band superconductors, where one of the bands has a reduced dimensionality, have been studied. It has been shown that the fluctuations are suppressed even when the coupling between the band condensate is very weak, and that this can greatly increase the superconducting transition temperature.
11. The characteristic lengths of a superconducting system with two coupled condensates in a two-band superconductor have been calculated numerically by solving equations of the microscopic superconductivity theory. The results made it possible to more accurately determine the physical meaning of the correlation length of superconductivity, which is important for the interpretation of existing experimental results.
12. Nonequilibrium dynamics of the order parameter of a superconducting ring has been investigated. Numerical simulations based on the time dependent Ginzburg-Landau theory have shown that rapid local heating in such a device can generate an electric current.