Scientific results:
- Using near-field optical interferometry of condensate luminescence, we have experimentally demonstrated the possibility of setting a weak connection in a semiconductor cylindrical pillar microcavity based on AlGaAs in the circular current of exciton-polariton condensate.
- It has been demonstrated by using strong feedback in an electron-nuclear spin system in single-charged quantum dots it is possible to bring an inhomogeneous electron spin ensemble to a state with a single-frequency Larmor precession in a transverse magnetic field. In this case highly-periodical optical excitation leads to a strong decrease in the amplitude of fluctuations of a nuclear spin system and to an increase in the of electron spin polarization lifetime.
- We have achieved a minimum value of a nuclear spin temperature of less than 1 μK attained as a result of adiabatic demagnetization in a constant magnetic field in a rotating coordinate system.
- We have developed a methodology for producing a device that demonstrates the Bose–Einstein condensation of excitons on the basis of MoSe2 with the use of pumping at a cryogenic temperature.
- Our researchers have developed a unique experimental methodology of spin noise spectroscopy that allows to study the behavior of the nuclear spins inside a crystalline substance. The method allows to perform non-perturbing tomography of the spin dynamics of paramagnetic media with optical resolution. The technique is applicable for the contactless vector magnetometry of external and internal magnetic fields in samples. Spin noise spectroscopy is successfully used for the research of spatial and spectral correlations of spin ensembles, including for the study of the statistical characteristics of a state-of-the-art source of laser radiation, the polariton laser.
- The Laboratory has proposed a new type of a laser – a boson cascade laser, which emits submillimeter electromagnetic waves. These waves have wide applications in telecommunications and medicine. A common laser is based on the effect of stimulated radiation, i. .e. on the Bose-stimulation of the optical junction, while in the proposed laser the effect of Bose-stimulation is used twice, first for the stimulation of the optical junction and then to form a macroscopically populated radiating state, which should significantly improve the characteristics of the boson laser.
- We have experimentally produced self-sustaining ring current of a superfluid light-liquid. The produced state is a macroscopic manifestation of quantum laws, similar to superconductivity and superfluidity. Thanks to its light-material nature, the achieved state has broad prospects in quantum simulators and optical computers.
- Our researchers have discovered a new effect of long-term optical memory in a semiconductor structure based on writing data in a spin system with the use of stimulating photon echo in a magnetic field. In this method data transfer from an optical field to a spin system occurs directly with the help of the effect of stimulated photon echo. Depending on the experimental conditions and the choice of the structure, the data steerage time can vary from picoseconds to tens of nanoseconds.
Implemented results of research:
- We have obtained two patents for useful models, «A terahertz electromagnetic wave emitter» and «A device for producing coherent terahertz electromagnetic waves».
- The Laboratory has registered two applications for useful models and applications for patents for inventions.
Education and career development:
- We have developed 5 special courses for master’s degree and bachelor’s degree students: «Spin dynamics of semiconductor nanostructures», «Technique and computerization of optical experiments», «Electrical properties of semiconductors», «Ultrafast spectroscopy of semiconductor heterostructures», «Physics and technology of epitaxial systems».
- We have organized academic internships for master’s degree and postgraduate students.
- Two Doctor of Sciences, 7 Candidate of Sciences dissertation and 12 master’s degree theses have been prepared and defended.
- The Laboratory annually conducts about 40 scientific seminars.
Organizational and structural changes: We have build and fully equipped three cryogenic optical laboratories.
Other results:
The academic supervisor of the Laboratory Alexey V. Kavokin is chair and organizer of many international scientific conferences, as well as co-chair of the scientific forum «Science of the Future – Science of the Youth».
Collaborations:
- Ioffe Institute of the Russian Academy of Sciences (Russia): joint international project and academic publications.
- University of Southampton (United Kingdom): joint research and publications
- Westlake Institute for Advanced Study (China PR): joint scientific research.
- The Laboratory also collaborates with TU Dortmund (Germany), Montpellier 2 University (France), the University of Crete (Greece).
