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61.
E. P. Domashevskaya V. A. Terekhov S. Yu. Turishchev D. A. Koyuda N. A. Rumyantseva Yu. P. Pershin V. V. Kondratenko N. Appathurai 《Physics of the Solid State》2013,55(3):634-641
This paper presents the results of the investigation of c-Si/[Si/Mo] n /Si multilayer nanoperiodic structures by X-ray absorption near-edge structure (XANES) spectroscopy using synchrotron radiation. Changes in the fine structure of XANES MoL 2,3 spectra confirm the formation of the silicide phase on heterophase interfaces Si/Mo/Si due to the solid-phase interactions between silicon and molybdenum layers. 相似文献
62.
T. Driscoll Y. V. Pershin D. N. Basov M. Di Ventra 《Applied Physics A: Materials Science & Processing》2011,102(4):885-889
We suggest and experimentally demonstrate a chaotic memory resistor (memristor). The core of our approach is to use a resistive
system whose equations of motion for its internal state variables are similar to those describing a particle in a multi-well
potential. Using a memristor emulator, the chaotic memristor is realized and its chaotic properties are measured. A Poincaré
plot showing chaos is presented for a simple nonautonomous circuit involving only a voltage source directly connected in series
to a memristor and a standard resistor. We also explore theoretically some details of this system, plotting the attractor
and calculating Lyapunov exponents. The multi-well potential used resembles that of many nanoscale memristive devices, suggesting
the possibility of chaotic dynamics in other existing memristive systems. 相似文献
63.
Memory effects are ubiquitous in nature and are particularly relevant at the nanoscale where the dynamical properties of electrons and ions strongly depend on the history of the system, at least within certain time scales. We review here the memory properties of various materials and systems which appear most strikingly in their non-trivial, time-dependent resistive, capacitative and inductive characteristics. We describe these characteristics within the framework of memristors, memcapacitors and meminductors, namely memory-circuit elements with properties that depend on the history and state of the system. We examine basic issues related to such systems and critically report on both theoretical and experimental progress in understanding their functionalities. We also discuss possible applications of memory effects in various areas of science and technology ranging from digital to analog electronics, biologically inspired circuits and learning. We finally discuss future research opportunities in the field. 相似文献
64.
V. F. Nesterenko S. A. Pershin A. N. Lazaridi S. I. Afanasenko E. V. Matizen P. I. Yefremova 《高压研究》2013,33(1-6):832-834
Abstract The results of investigating the processes of explosive compaction of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O powdered ceramic high temperature superconducting materials and the shock-induced variation of their properties are presented. The possibility for obtaining metal-ceramic cylinder and spiral-shaped articles is illustrated. The shock wave loading of sintered ceramics is shown to result in degrading its superconducting properties up on R(T), which are subsequently restored by low-temperature annealing. The loss of superconducting properties is demonstrated to correlate with the X-ray lines width. In case of Bi-4334 ceramic, we have observed the improving SP-properties on susceptibility just after shocking it. The effect of the compaction pressure, initial particle size, atmosphere (air, O2, N2), initial temperature on material properties is studied. 相似文献
65.
Rotational resonances of ortho and para spin isomers of the H2O molecule are observed in hexagonal ice using four-photon spectroscopy of coherent light scattering. It is experimentally
shown that the resonant contribution to the four-photon scattering signal from para H2O spin isomers in ice is about half as large as that in the liquid phase. 相似文献
66.
A. M. Mandel V. B. Oshurko S. G. Veselko K. G. Solomakho S. M. Pershin A. A. Sharts 《Bulletin of the Lebedev Physics Institute》2018,45(9):282-286
It is shown that the effective Lande splitting factor or g-factor of electrons localized on heterostructures such as small quantum dots is always formed as a difference of two values. The first of themrelates to thematerial of the dot itself and critically depends on its sizes and shape; the second one relates to the barriermaterial (surrounding matrix); therewith, the dependence on the latter does not disappear at any dot sizes. The known (k, p) Kane theory defining the renormalization of electron mass and g-factor in bulk semiconductors, is modified for small quantum dots with “incomplete” band structure. Specific calculations of the electron ground state energy and g-factor are performed for the covariant InAs/AlSb heterostructure not localizing holes and, hence, capable of forming pure one-electron states (prototypes of solid-state qubits). 相似文献
67.
S. M. Pershin 《Physics of Wave Phenomena》2009,17(4):241-250
A mechanism is proposed for the previously observed [1] jump in erythrocyte fluidity through a microcapillary 1.3 μm in diameter
at a temperature of 36.6±0.3°C. Our interpretation is based on the experimental evidence both for existence of ortho and para
H2O isomers in water and on spin-selective interaction of proteins with para H2O isomers as hydration shells of biomolecules are being formed [2]. It is important that the formation of hydration shells
of proteins and DNA in aqueous solutions is accompanied by an increase in the Brillouin shift to 0.4 cm−1 (≃0.25 cm−1 in water), which points to the formation of icelike structures. We believe that the coincidence of the translational energy
kT of the Brownian motion and the energy of the rotational quanta for the 313–202 transition of para H2O isomers at the temperature 36.6°C increases the probability for excitation of para H2O isomers in collisions. Collisions mix quantum states of closely spaced levels in para H2O (313, 285.2 cm−1) and ortho H2O (330, 285.4 cm−1) and induce conversion of para isomers to ortho H2O. It is assumed that this conversion in the icelike hydration shell of hemoglobin (Hb) is accelerated under the catalyzing
effect of oxygen and iron present in Hb and triggers a chain reaction: release of ortho H2O isomers through the erythrocyte membrane→compaction of Hb molecules and increase in concentration of catalysts→acceleration
of conversion→structural gel-sol transition. It is the sequence of these processes that provides a jump in fluidity of erythrocytes
through a microcapillary and the anomalous increase in fluidity of the aqueous solution of hemoglobin by almost an order of
magnitude at temperatures close to 36.6°C and an increase in the solution concentration by a factor of 1.7. 相似文献
68.
Bunkin A. F. Mikhalevich V. G. Pershin S. M. Streltsov V. N. 《Physics of Wave Phenomena》2019,27(4):278-280
Dynamics of a suspension of dielectric nanoparticles in an intense laser field is considered for the first time. A two-dimensional model is developed for interaction of laser radiation with nanoparticles in a suspension. A stable spatial configuration of nanospheres in a suspension is found and dispersion relations for low-lying excitations of a multiparticle system are determined within the model.
相似文献69.
A new multiscale modeling method for simulating the loss processes in polymer solar cell nanodevices
The photoelectric power conversion efficiency of polymer solar cells is till now, compared to conventional inorganic solar cells, still relatively low with maximum values ranging from 7% to 8%. This essentially relates to the existence of exciton and charge carrier loss phenomena, reducing the performance of polymer solar cells significantly. In this paper we introduce a new computer simulation technique, which permits to explore the causes of the occurrence of such phenomena at the nanoscale and to design new photovoltaic materials with optimized opto-electronic properties. Our approach consists in coupling a mesoscopic field-theoretic method with a suitable dynamic Monte Carlo algorithm, to model the elementary photovoltaic processes. Using this algorithm, we investigate the influence of structural characteristics and different device conditions on the exciton generation and charge transport efficiencies in case of a novel nanostructured polymer blend. More specifically, we find that the disjunction of continuous percolation paths leads to the creation of dead ends, resulting in charge carrier losses through charge recombination. Moreover, we observe that defects are characterized by a low exciton dissociation efficiency due to a high charge accumulation, counteracting the charge generation process. From these observations, we conclude that both the charge carrier loss and the exciton loss phenomena lead to a dramatic decrease in the internal quantum efficiency. Finally, by analyzing the photovoltaic behavior of the nanostructures under different circuit conditions, we demonstrate that charge injection significantly determines the impact of the defects on the solar cell performance. 相似文献
70.
A nonempirical study on isomerization in the FC1O-FOCl system 总被引:1,自引:0,他引:1