Browsing by Author "Tekman, E."
Now showing items 1-16 of 16
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Adhesive energy, force and barrier height between simple metal surfaces
(1992)Using the self-consistent field pseudopotential method we calculated the adhesive energy, perpendicular and lateral forces and barrier height between two rigid A1(001) slabs modeling the sample and a blunt tip. We found ... -
Atomic theory of scanning tunneling microscopy
(American Physical Society, 1989)We present a quantitative analysis of the modifications of the scanning-tunneling-microscopy images due to the local perturbations of the electronic states induced by the tip in close proximity to the sample surface. Using ... -
Ballistic transport through a quantum point contact: elastic scattering by impurities
(American Physical Society, 1990)The effects of elastic scattering due to impurities in a quasi-one-dimensional constriction are investigated with an exact calculation of the conductance. It is found that the quantization of conductance is distorted owing ... -
Critical study of perturbative approaches to tunneling
(1992)One of the long-lasting objectives of the theory of tunneling is to express the transmission probability in terms of the wave functions of infinitely separated electrodes. This can be achieved by the application of a ... -
Delta-Doping in strained (Si) / (Ge) superlattices
(American Physical Society, 1988)We present a comparative study of the pseudomorphic (Si)6/(Ge)6 and -doped (Si)3(Sb)(Si)2/(Ge)6 superlattices using the self-consistent pseudopotential method. The strained (Si)6/(Ge)6 superlattice has the lowest conduction-band ... -
Effects of the constriction geometry on quasi-one-dimensional transport: Adiabatic evolution and resonant tunneling
(American Physical Society, 1989)The geometry of a constriction, which plays a crucial role in quasi-one-dimensional (quasi-D) ballistic transport, is investigated by performing calculations of the conductance. If the constriction becomes smoothly narrower ... -
Fano resonances in quasi-one-dimensional electron waveguides
(American Physical Society, 1993)In the spectroscopy of atoms and molecules, an asymmetric Fano resonance arises whenever a bound state associated with one electronic configuration is coupled to the ionization continuum of a different configuration. A ... -
Novel features of quantum conduction in a constriction
(American Physical Society, 1989)The effects of the geometry and temperature on the quantum conductance for one-dimensional (1D) ballistic transport through a constriction in a 2D electron gas are investigated by use of a refined formalism. As the length ... -
Potential oscillations near a barrier in the presence of phase-breaking scattering
(1992)Using the Greens function method for nonequilibrium processes, we study the potential oscillations near a barrier in both coherent- and incoherent-transport regimes. In the fully coherent regime the local electrochemical ... -
Theoretical study of focused field emission of electrons from a point source
(American Physical Society, 1990)We clarify basic mechanisms for focused field emission of electrons from a point source. The effective potential barrier arising from the lateral confinement of current carrying states is shown to be essential for subband ... -
Theoretical study of short-and long-range forces and atom transfer in scanning force microscopy
(1992)We investigate the interaction energy, the short-range force components, and the electron potential between two Al(001) slabs, which mimic a blunt tip close to an atomically corrugated sample in scanning force microscopy. ... -
Theoretical study of transport through a quantum point contact
(1991)We developed a formalism within the linear-response theory to investigate the transport through a quantum point contact between two electron-gas reservoirs. It is valid for two-terminal conductance through a constriction ... -
Theory of anomalous corrugation of the Al (111) surface obtained from scanning tunneling microscopy
(1990)We provide an explanation of the observed anomalous corrugation of the Al(111) surface by calculating the current between the Al(111) sample and tip. An atomically sharp tip images the corrugation of the surface potential, ... -
Theory of transition from the tunneling regime to point contact in scanning tunneling microscopy
(American Physical Society, 1989)We analyze the transition from the tunneling regime to point contact in scanning tunneling microscopy. The variation of conductance as a function of tip-sample separation is sample and tip specific. Tunneling occurs through ... -
Tip induced localized states in scanning tunneling microscopy
(Institute of Physics Publishing Ltd., 1988)We have investigated the Scanning Tunneling Microscopy (STM) of graphite with varying tip-to-surface distance. Using an LCAO type approach we showed that at small separations states are localized between the tip and the ... -
Tip-structure effects on atomic force microscopy images
(1991)The authors study the effects of tip structure on images in atomic force microscopy by using a periodic force field fitted to ab-initio force calculations. 'Ideal' images resolving the sample atoms can be obtained with ...
