7 results match your criteria: "P.N. Lebedev Physical Institute of the RAS[Affiliation]"
Hypersound tomography of graphitized layers buried into diamond matrix.
Photoacoustics
August 2023
P.N. Lebedev Physical Institute of the RAS, Leninsky Prospekt 53, Moscow 119991, Russia.
Acoustic properties of buried graphitized layers in diamond formed by ion implantation followed by annealing were studied using the picosecond ultrasonic technique with spatial resolution. Two methods of elastic pulse generation were used: heating an aluminum film deposited on a diamond sample by femtosecond laser pulses and direct illumination of the graphitized layers by these pulses. We applied a multilayered model of the acousto-optical response to fit experimental results and estimate the distribution of the acoustical parameters (wave resistance, viscoelastic damping, and longitudinal sound speed) of the structures under study in depth.
View Article and Find Full Text PDF3D Hypersound Microscopy of van der Waals Heterostructures.
Nano Lett
March 2022
P.N. Lebedev Physical Institute of the RAS, Leninsky Prospekt 53, Moscow 119991, Russia.
Article Synopsis
- The study explores the mechanical properties of layered crystals with a focus on hBN/WSe/hBN heterostructures, using a specialized ultrasonic technique for detailed analysis.
- A picosecond measurement method analyzes the temporal changes in reflection coefficients after laser pulse excitation, allowing for the detection of sound waves reflecting off various layers within the structure.
- The findings highlight the low phonon dissipation in these materials below 150 GHz, indicating their promise for applications in nanotechnology and acoustics.
Effect of Sr Doping on Structural and Transport Properties of BiTe.
Materials (Basel)
December 2021
P.N. Lebedev Physical Institute of the RAS, 119991 Moscow, Russia.
Search for doped superconducting topological insulators is of prime importance for new quantum technologies. We report on fabrication of Sr-doped Bi2Te3 single crystals. We found that Bridgman grown samples have -type conductivity in the low 1019 cm-3, high mobility of 4000 cm2V-1s-1, crystal structure independent on nominal dopant content, and no signs of superconductivity.
View Article and Find Full Text PDFElectromagnetic microwave generation by acoustic vibrations gives rise to nanoradiophotonics.
Sci Rep
April 2021
P.N. Lebedev Physical Institute of the RAS, Leninskii pr., 53, Moscow, 119991, Russia.
Article Synopsis
- Researchers are focusing on innovative techniques for creating pulsed electromagnetic microwave radiation, particularly using optical pumping methods.
- A new method is proposed and tested that utilizes the radiation from charged submicron particles oscillating at their natural acoustic frequencies.
- The study highlights how laser radiation can effectively enhance acoustic vibrations in these submicron particles through the Raman mechanism.
Superconductivity in Cu Co-Doped SrBiSe Single Crystals.
Materials (Basel)
November 2019
P.N. Lebedev Physical Institute of the RAS, 119991 Moscow, Russia.
In this study, we grew Cu co-doped single crystals of a topological superconductor candidate Sr x Bi 2 Se 3 , and studied their structural and transport properties. We reveal that the addition of even as small an amount of Cu co-dopant as 0.6 atomic %, completely suppresses superconductivity in Sr x Bi 2 Se 3 .
View Article and Find Full Text PDFRaman scattering for dosimetry using GAFCHROMIC EBT3 radiochromic dosimetry film.
Med Phys
April 2019
P.N. Lebedev Physical Institute of the RAS, Moscow, Russia, 119991.
Purpose: Raman scattering spectra can be thought of as the "fingerprints" of the investigated material. The purpose of this work was to link the absorbed doses of irradiated radiochromic film at the micrometer level with changes in their Raman spectra.
Methods: Raman spectra of irradiated GAFCHROMIC EBT3 film with doses ranging from 0 to 40 Gy were acquired.
Quantum Nonlinear Optics with a Germanium-Vacancy Color Center in a Nanoscale Diamond Waveguide.
Phys Rev Lett
June 2017
Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA.
We demonstrate a quantum nanophotonics platform based on germanium-vacancy (GeV) color centers in fiber-coupled diamond nanophotonic waveguides. We show that GeV optical transitions have a high quantum efficiency and are nearly lifetime broadened in such nanophotonic structures. These properties yield an efficient interface between waveguide photons and a single GeV center without the use of a cavity or slow-light waveguide.
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