Marat Khafizov

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Femtosecond pump-probe studies show that carrier dynamics in MgB2 films is governed by the sub-ps electron-phonon (e-ph) relaxation present at all temperatures, the few-ps e-ph process well pronounced below 70 K, and the sub-ns superconducting relaxation below T(c). The amplitude of the superconducting component versus temperature follows the superposition(More)
Upon absorption of single photons, multiple excitons were generated and detected in semiconducting single-walled carbon nanotubes (SWNTs) using transient absorption spectroscopy. For (6,5) SWNTs, absorption of single photons with energies corresponding to three times the SWNT energy gap results in an exciton generation efficiency of 130% per photon. Our(More)
Simultaneous measurement of local thermal diffusivity and conductivity is demonstrated on a range of ceramic samples. This was accomplished by measuring the temperature field spatial profile of samples excited by an amplitude modulated continuous wave laser beam. A thin gold film is applied to the samples to ensure strong optical absorption and to establish(More)
This thesis presents a detailed study of structural and optoelectronic properties of Hgbased high temperature superconductors (HBCCO). The optical and terahertz characterization techniques used include time-resolved pump-probe spectroscopy, photoimpedance measurements, transmission terahertz time-domain spectroscopy (THz-TDS), and optical-pump and THz-probe(More)
The recent discovery of superconductivity in MgB2, with its BCS-like Cooper pairing mechanism and the 40-K critical temperature, and the demonstration of efficient single-optical-photon detection in superconducting NbN nanowire meanders inspired an interest in the development of superconducting radiation detectors based on MgB2. We report the results of our(More)
On the basis of observation of 60 patients in the prodromic period of acute virus hepatitis admitted with symptoms of acute appendicitis the authors discuss problems of differential diagnosis of these diseases. One out of 6 operated patients proved to have phlegmonous appendicitis. The surgical intervention (appendicectomy) did not influence the severity of(More)
This thesis is devoted to the optical characterization of Cd(Mn)Te single crystals. I present the studies of free-carrier dynamics and generation and detection of coherent acoustic phonons (CAPs) using time-resolved femtosecond pump-probe spectroscopy. The giant Faraday effect and ultrafast responsivity of Cd(Mn)Te to sub-picosecond electromagnetic(More)
We present fabrication and optical time-resolved photoresponse characterization of MgB2 superconducting thin films. The films were prepared on crystalline and flexible plastic substrates by vacuum co-deposition of B and Mg precursors and high-temperature annealing in an Ar or vacuum atmosphere. The post-annealed films exhibited very smooth surfaces and(More)
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