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1.
We discuss the notion of spin squeezing considering two mutually exclusive classes of spin-s states, namely, oriented and non-oriented states. Our analysis shows that the oriented states are not squeezed while non-oriented
states exhibit squeezing. We also present a new scheme for construction of spin-s states using 2s spinors oriented along different axes. Taking the case of s=1, we show that the ‘non-oriented’ nature and hence squeezing arise from the intrinsic quantum correlations that exist among
the spinors in the coupled state. 相似文献
2.
Viktor Takts Ivan Vojnarovich Ivan Csarnovich Attila Csik Volodimir Cheresnya Myroslav Shyplyak K.S. Sangunni 《Journal of Non》2009,355(37-42):1962-1965
The role of the compositional modulation at nano-scale dimensions (2–10 nm) in the enhancement of optical recording parameters in nanomultilayers, which contain Sb as active, optical absorbing and diffusing layers and As2S3 as barrier (matrix) layers was investigated. Comparison was made with single homogeneous layers made of ternary (As2S3)xSb1−x glasses and co-deposited from Sb and As2S3. It was shown that essential increase of the recording efficiency, sensitivity of the bleaching process, broadening of its spectral range occurs due to the stimulated interdiffusion of adjacent components in Sb/As2S3 nanomultilayers with optimized Sb layer thickness. 相似文献
3.
The aim of this brief report is to study the behaviour of sheath structure in a multi-component plasma with dust-neutral collisions.
The plasma consists of electrons, ions, micron size negatively charged dust particles and neutrals. The sheath-edge potential
and sheath width are calculated for collisionally dominated sheath. Comparison of collisionless and collisionally dominated
sheath are made. 相似文献
4.
Analysis of a TE011 mode composite sapphire-rutile dielectric resonator has been carried out to study the temperature variation of resonance
frequency, close to the Cs atomic clock hyperfine frequency of 9.192 GHz. The complementary behavior of dielectric permittivity
with temperature of the composite has been exploited to obtain the desired turning point in the resonant frequency. The frequency
of the composite structure is found to be independent of the shield diameter beyond four times the puck diameter. 相似文献
5.
We report the observation of giant photo induced optical bleaching in Sb/As2S3 multilayered film at room and liquid He temperatures, when irradiated with 532 nm laser at moderate intensities. The experimental results show a dramatic increase in transmittance near the band gap regime at both the temperatures; however the rates at which transmission change occurs are rather slow at low temperature. The huge change in transmission is due to the photo induced intermixing of As2S3 layer with Sb. Our XPS measurements show that photo induced intermixing occurs through the wrong homopolar bonds, which under actinic light illumination are converted into energetically favored hetropolar bonds. 相似文献
6.
Ge2Sb2Te5 (GST) films, one of the most suitable Chalcogenide alloys for Phase change Random Access Memory applications are studied for changes in sheet resistance, optical transmission, morphology and surface science by annealing at various transition temperatures. The crystallization leads to an increase of grain size and roughness in the films and the resistance changes to three orders of magnitude. Optical studies on GST films show distinct changes during phase transitions and the optical parameters are calculated. An increase of Tauc parameters B1/2 indicates a reduction in disorder during phase transition. It is confirmed from XPS studies that Ge-Te, Sb-Te bonds are present in both amorphous and crystalline phases whereas Sb-Ge, Te-Te, Sb-Sb bonds are absent. 相似文献
7.
Exposure with above band gap light and thermal annealing at a temperature near to glass transition temperature, of thermally evaporated amorphous (As2S3)0.85Sb0.15 thin films were found to be accompanied by structural effects, which in turn, lead to changes in the optical properties. The optical properties of thin films induced by illumination and annealing were studied by Fourier Transform Infrared spectrometry, X-ray Photoelectron Spectroscopy and Raman Spectroscopy. Photodarkening or photobleaching was observed in the film depending upon the conditions of the light exposure or annealing. These changes of the optical properties are assigned to the change of homopolar bond densities. The photodarkening in the as-prepared film was seen at low temperature (4.2 K). 相似文献
8.
Ramesh K. Asokan S. Sangunni K.S. Gopal E.S.R. 《Applied Physics A: Materials Science & Processing》1999,69(4):421-425
Electrical switching in germanium telluride glasses containing metallic atoms (Cu and Ag) has been investigated. All these
glasses are found to exhibit memory switching. The switching fields of these glasses are compared with the thermal parameters
evaluated from DSC studies and the results are explained on the basis of the thermal model. The composition dependence of
the switching field and the thermal parameters show interesting variations at the critical compositions which correspond to
the rigidity percolation and the chemical thresholds of these glasses.
Received: 11 January 1999 / Accepted: 14 April 1999 / Published online: 14 July 1999 相似文献
9.
K. Ramesh S. Asokan K.S. Sangunni E.S.R. Gopal 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,6(2):207-212
Differential Scanning Calorimetric (DSC) studies on AgxGe15Te85-x glasses have been undertaken over a wide range of compositions, to understand the effect of topological thresholds on thermal
properties. It is found that the compositional dependence of glass transition temperature (T
g
), crystallization temperature (T
c
), activation energy for crystallization and thermal stability show anomalies at the rigidity percolation threshold. Unusual variations also observed in different thermal properties at
the composition x = 20, clearly establishes the occurrence of chemical threshold in these glasses.
Received: 27 January 1998 / Revised: 12 June 1998 / Accepted: 3 July 1998 相似文献
10.
Ramakanta Naik K.V. Adarsh R. Ganesan K.S. Sangunni S. Kokenyesi Uday Deshpande T. Shripathi 《Journal of Non》2009,355(37-42):1836-1839
Photoinduced diffusion in Se/As2S3 and Sb/As2S3 nanomultilayered thin films are studied by X-ray photoelectron spectroscopy (XPS). The XPS measurements show the atomic movements during photoinduced diffusion in Se/As2S3 and Sb/As2S3 nanomultilayered film. The analysis of experimental data describes the nature of light induced changes in different structural units. 相似文献