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Level Position (level + position)

Distribution by Scientific Domains
Physics and Astronomy60%

Selected Abstracts

Far-infrared spectroscopy of shallow acceptors in semi-insulating GaAs: evidence for defect interactions with EL2

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 1 2003
H. Ch.
Abstract Far-infrared FTIR absorption measurements are carried out at 10 K in order to assess the uncompensated fraction of shallow acceptors in semi-insulating GaAs after optical bleaching of EL2. In carbon-doped material a linear correlation of the G line at 122.3 cm,1 with the CAs concentration is found in the whole concentration range between 1 × 1014 and 2 × 1016 cm,3. In samples co-doped with zinc in the range around 1 × 1016 cm,3 and 1 to 2 × 1015 cm,3 carbon, both, ZnGa - and CAs -related far-infrared absorption lines are observed. Taking into consideration the Fermi level position after bleaching of EL2, it can be concluded that no other donors than EL2 are present above a total concentration of 1 × 1015 cm,3. In addition to the far-infrared measurements, the intracentre transition of EL2 (A1 , T2) at 1.0389 eV is studied. The results are compatible only with an increase of the total EL2 concentration with the shallow acceptor concentration. Possible mechanisms for the interaction between shallow- and deep-level defects are discussed. [source]

Variation of the Fermi level in n-type microcrystalline silicon by electron bombardment and successive annealing: ESR and conductivity studies

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 3-4 2010
Oleksandr Astakhov
Abstract ESR and conductivity studies have been preformed on ,c-Si:H exposed to 2 MeV electron bombardment and successive annealing in order to investigate the influence of the defect density on the electronic properties of n-type ,c-Si:H. With this approach one can vary the defect density in one and the same sample and directly deduce its influence on the electronic properties. The defect density is varied by 2 orders of magnitude with strong influence on the dark conductivity and electron spin resonance (ESR) properties. The relationship of ESR and conductivity data obtained over the whole defect density range is in agreement with the data obtained on the sets of samples deposited with different doping level. The results indicate that the Fermi level position in ,c-Si:H is defined by a balance of defect and donor states densities regardless of which of these quantities is varied. (© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Spin-polarized resonant tunneling through two coupled quantum dots

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2006
P. Trocha
Abstract Resonant electronic transport through two coupled non-interacting single-level quantum dots attached to ferromagnetic leads with collinear magnetizations is analyzed theoretically. Coupling of the dots to external leads as well as the inter-dot coupling are assumed to be spin dependent. Basic transport characteristics, including current-voltage curves, linear and nonlinear conductance, and tunnel magnetoresistance associated with magnetization rotation are calculated using the Green function technique. The relevant Green functions have been calculated by the equation of motion method. Variation of the transport characteristics with such system parameters like energy level position, spin polarization of the leads, and coupling between the dots has been calculated numerically. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

What Is Important on the Job?

JOURNAL OF APPLIED SOCIAL PSYCHOLOGY, Issue 1 2010
Differences Across Gender, Job Level, Perspective
The importance ratings of job competency dimensions on a 360-degree feedback instrument were examined. We hypothesized that men (incumbents and bosses) would rate agentic behaviors higher in importance than would women, and that women (incumbents and bosses) would rate communal behaviors higher in importance than would men. Differences were found for men and women across rating sources and across job level (organizational position). The present findings suggest that men and women incumbents view different factors as important for their jobs and that people in higher level jobs place more importance on agentic behaviors than do those in lower level positions, and people in lower level jobs place more importance on communal behaviors than do those in higher level positions. [source]