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Local Optical Phenomena in InAs/GaAs Heterostructures with Quantum Dots and Artificial Molecules
Pavel Tomanek,Lubomir Grmela 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Due to a long electron lifetime at the excited levels of quantum dot (QDs), the use of QDs as a basis for new optoelectronic devices is very promising. Inter- and intraband light absorption studies in QDs are useful not only for investigations of photodetectors but they also are the necessary condition of the development of new types of mid-infrared lasers. In the paper the preliminary results of experimental and theoretical studies of the local optical phenomena in n- and p-doped InAs/GaAs QDs and artificial molecules formed by pairs of QDs are presented. The peculiarities in local photoluminescence spectra can be associated with absorption peaks connect ed with intraband interlevel transitions of electrons and holes between the ground and excited states.
Ballistic conductance in quantum devices: from organic polymers to nanotubes
David Tománek 한국물리학회 2002 Current Applied Physics Vol.2 No.1
With the size of electronic devices approaching the nanometer scale, transition to self-assembly in molecular electronics systems appears to be technologically the next step to pursue. Quantum conductors with an especially high potential for applications are organic polymers and carbon nanotubes. The latter are being considered for use as both nonlinear electronic devices and as connectors between molecular electronics devices and the ‘‘outside world’’. Depending on their internal structure and the nature of the electric contact to leads, these systems may exhibit fractional conductance quantization. 2002 Elsevier Science B.V. All rights reserved.
Enhancing mechanical toughness of aluminum surfaces by nano-boron implantation: An ab initio study
Zhu, Z.,Kwon, D.G.,Kwon, Y.K.,Tomanek, D. North Holland 2015 Chemical physics letters Vol.620 No.-
Searching for ways to enhance surface hardness of aluminum, we study the equilibrium structure, stability, elastic properties and formation dynamics of a boron-enriched surface using ab initio density functional calculations. We used molecular dynamics simulations to model the implantation of energetic boron nanoparticles in Al and identify structural arrangements that optimize the formation of strong covalent B?Al bonds. Nano-indentation simulations based on constrained optimization suggest that presence of boron nanostructures in the subsurface region enhances significantly the mechanical hardness of aluminum surfaces.