Alexey Rubtsov
Moscow State University, Physics, Faculty Member
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The band structure calculations in the GGA+U approximation show the presence of additional lattice distortions in the magnetically ordered phase of AgCrS2. The magnetostriction leads to the formation of long and short Cr-Cr bonds in the... more
The band structure calculations in the GGA+U approximation show the presence of additional lattice distortions in the magnetically ordered phase of AgCrS2. The magnetostriction leads to the formation of long and short Cr-Cr bonds in the case when the respective Cr ions have the same or opposite spin projections. These changes in the Cr lattice are accompanied by distortions of the CrS6 octahedra, which in turn lead to the development of spontaneous electric polarization.
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We report a spectroscopic SHG study of short-period Si/SiO2 MQWs. Strong thickness-dependent resonances were observed that can be interpreted as intersubband transition. A new potential well model is suggested with electrostatic... more
We report a spectroscopic SHG study of short-period Si/SiO2 MQWs. Strong thickness-dependent resonances were observed that can be interpreted as intersubband transition. A new potential well model is suggested with electrostatic self-images being taken into account. MQW structures were made by RF magnetron sputtering on a Si(100) substrate and consisted of 40 double layers of Si/SiO2. For the spectroscopic SHG experiments a Ti:sapphire laser between 710 and 850 nm with a pulse duration of about 100 fs and an average input power of 0.1 W was used.
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ABSTRACT Not Available
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Size effects in optical second harmonic generation (SHG) from Si(001)-SiO2 planar micro-cavity structures are studied for fundamental wavelengths from 700 nm to 850 nm. The observed dependence of SHG intensity on the thickness of oxide... more
Size effects in optical second harmonic generation (SHG) from Si(001)-SiO2 planar micro-cavity structures are studied for fundamental wavelengths from 700 nm to 850 nm. The observed dependence of SHG intensity on the thickness of oxide layer is explained, in part, by an optical Casimir nonlocality arising from interference of zero-point fluctuations in micro-cavity, which is distinguished from microscopic interface effects.
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A determinantal continuous-time quantum Monte Carlo (CTQMC) algorithm based on the numerically exact calculation of the fermionic path-integral is proposed. This CTQMC algorithm is ideally suited for the systems with non-local in time and... more
A determinantal continuous-time quantum Monte Carlo (CTQMC) algorithm based on the numerically exact calculation of the fermionic path-integral is proposed. This CTQMC algorithm is ideally suited for the systems with non-local in time and space interactions since it does not invoke Hubbard-Stratonovich transformation. The method is based on a stochastic series expansion for the partition function. The CTQMC algorithm is
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Summary form only given. The authors study second harmonic generation from SiO2/Si buried interfaces. They determine the quadratic susceptibility using an approach involving the theory of the Casimir effect.
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In this article previous and recent results of our nonlinear optical studies of low-dimensional structures are surveyed. Size effect in the optical second-harmonic generation (SHG) from Ag nanocrystals in island films and CdSe quantum... more
In this article previous and recent results of our nonlinear optical studies of low-dimensional structures are surveyed. Size effect in the optical second-harmonic generation (SHG) from Ag nanocrystals in island films and CdSe quantum dots in glass matrices as well as thermo- and DC-electric-field-induced effects in SHG from SiSiO2 multiple quantum wells (MQWs) on Si substrate are studied experimentally and