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Invited researcher Yakovlev Dmitri Robert
Time span of the project
2021-2023
General information

Emerging goals of nanophotonics, optoelectronics and quantum technologies for processing and storage of information require the use of new materials. The project is devoted to the study of three emerging materials with extreme two-dimensionality: colloidal semiconductor nanoplatelets, monatomic layers of transition metal dichalcogenides and two-dimensional perovskites. These materials have common properties that make them attractive for both basic science and applications. These are large exciton binding energy of several tens and hundreds of millielectronvolts, high efficiency of luminescence in the visible and near-infrared range, an important role of the surface and the possibility of its functionalization, relatively simple synthesis of structures which does not require expensive equipment. Optical experimental methods will be used to study spin-dependent phenomena and nonlinear optical properties.

Name of the project: Spin physics of two-dimensional materials: colloidal nanoplatelets, transition metal dichalcogenides and perovskites

Strategy for Scientific and Technological Development Priority Level: А

Goals and objectives

The main goal of the project is to develop spin physics of new two-dimensional materials. Application of known and development of new optical spectroscopy methods for investigation of spin-dependent effects, spin structure and spin dynamics of charge carriers and exciton complexes. Study of the role of extreme two-dimensionality, dielectric confinement, surface in two-dimensional materials and corresponding hybrid structures. Search for effects applicable in nanophotonics, optoelectronic devices and quantum information technologies. The Laboratory of Spin Physics of Two-Dimensional Materials will be established in P.N. Lebedev Physical Institute under the supervision of D.R. Yakovlev, an expert in spin physics of semiconductor nanostructures, who has extensive experience in organizing scientific research and international scientific cooperation. The goal is to set it as a world-class scientific center.

The practical value of the study
Еxpected results:

  1. Three experimental facilities will be established and optical methods of spin physics will be tested to investigate emerging two-dimensional materials: femtosecond pump-probe Faraday/Kerr rotation spectroscopy, optical detection of electron and nuclear spin resonances, picosecond acoustics and spin-induced generation of optical harmonics.
  2. New experimental approaches will be developed and the existing methods of investigation of spin structure and spin dynamics will be modified taking into account the specifics of new two-dimensional materials: optical methods for measuring both picosecond and infinitely long spin relaxation times, methods for determining spin coherence homogeneous time in two-dimensional systems with strong inhomogeneity.
  3. Lande g-factors, basic spin relaxation times T1, T2 and T2* for charge carriers and excitons in a wide range of temperatures and magnetic fields will be measured. The mechanisms of spin relaxation will be revealed and the role of spatial diffusion, interaction with nuclear spins and exchange interaction between charge carriers will be clarified.
  4. Investigation of the efficiency of optical harmonics generation and obtaining information on the oscillator strength of optical transitions, the symmetry of electronic states and the distribution of local electric and magnetic fields and mechanical stress, violating this symmetry.
  5. Investigation of the hybrid structures based on new two-dimensional materials, which allow application of electric field to control the exciton energy and oscillator strength, as well as spin polarization
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