Magnetic properties of Mn-doped Ge46 and Ba8Ge46 clathrates

We present a detailed study of the magnetic properties of unique cluster assembled solids namely Mn doped Ge46 and Ba8Ge46 clathrates using density functional theory. We find that ferromagnetic (FM) ground states may be realized in both the compounds when doped with Mn. In Mn2Ge44, ferromagnetism is driven by hybridization induced negative exchange splitting, a generic mechanism operating in many diluted magnetic semiconductors. However, for Mn-doped Ba8Ge46 clathrates incorporation of conduction electrons via Ba encapsulation results in RKKY-like magnetic interactions between the Mn ions. We show that our results are consistent with the major experimental observations for this system.Comment: 6 pages, 4 figure

Lower- and higher-order nonclassical properties of photon added and subtracted displaced Fock states

Nonclassical properties of photon added and subtracted displaced Fock states have been studied using various witnesses of lower- and higher-order nonclassicality. Compact analytic expressions are obtained for the nonclassicality witnesses. Using those expressions, it is established that these states and the states that can be obtained as their limiting cases (except coherent states) are highly nonclassical as they show the existence of lower- and higher-order antibunching and sub-Poissonian photon statistics, in addition to the nonclassical features revealed through the Mandel $Q_M$ parameter, zeros of Q function, Klyshko's criterion, and Agarwal-Tara criterion. Further, some comparison between the nonclassicality of photon added and subtracted displaced Fock states have been performed using witnesses of nonclassicality. This has established that between the two types of non-Gaussianity inducing operations (i.e., photon addition and subtraction) used here, photon addition influences the nonclassical properties more strongly. Further, optical designs for the generation of photon added and subtracted displaced Fock states from squeezed vacuum state have also been proposed.Comment: A comparative study of the nonclassicality present in photon added and subtracted displaced Fock states shows photon addition is generally preferable nonclassicality inducing operation, while subtraction also has advantage in some cases over additio

Evaluasi Penerimaan Teknologi Informasi di Beberapa Perguruan Tinggi Swasta di Kota Palembang

Information technology is an invaluable tool in solving the problems faced by humans. Utilization of information technology to provide better performance implications on information technology. Information and technologies that support college activities is a valuable asset. College success is usually to understand the advantages and usefulness of information technology to support high-performance university. Unified Theory Of Acceptance And Use Of The Technolgy (UTAUT) Model is a model of information technology acceptance. User acceptance is an important factor affecting the successful implementation of a technology. The study results showed that simultaneous or partially contained a significant and positive relationship between the variables of performance expectancy, effort expectancy, social influence, Behavioral Intention and Behavior Use of the Technology Acceptance variables. While the results of regression analysis obtained by the fact that the contribution of these three variables is 58.9% of the revenues of Information Technology. Keywords:UTAUT Model, User Acceptance, and Information Technolog