Now showing items 1-10 of 1509
Spin gaps and spin-flip energies in density-functional theory
(AMER PHYSICAL SOC, 2010)
Energy gaps are crucial aspects of the electronic structure of finite and extended systems. Whereas much is known about how to define and calculate charge gaps in density-functional theory (DFT), and about the relation ...
Spectroscopic studies of SnO2 doped with Cr, Co or Nb
SnO2 ceramics doped with different amounts of Co, Cr or Nb were investigated using visible and infrared spectroscopy at room temperature. Based on the observed d-d transitions the valence states of incorporated dopants ...
Comparison of some theoretical models for fittings of the temperature dependence of the fundamental energy gap in GaAs
(Sociedade Brasileira de Física, 2010)
In this work we report on a comparison of some theoretical models usually used to fit the dependence on temperature of the fundamental energy gap of semiconductor materials. We used in our investigations the theoretical ...
Electrical and optical characteristics of SnO2 thin films prepared by dip coating from aqueous colloidal suspensions
Starting from aqueous colloidal suspensions, undoped and Nb5+ doped SnO2 thin films have been prepared by using the dip-coating sol gel process. X-ray diffraction results show that films are polycrystalline with crystallites ...
Temperature dependence of optical transitions in AlGaAs
(Amer Inst PhysicsMelvilleEUA, 2001)
Optical absorption and band gap shift of n-doped AlxGa1???xAs alloys grown by MBE
(Microelectronic Engineering, 1998)
WAVE FUNCTION INSTABILITIES IN THE CIS-TRANS ISOMERIZATION AND SINGLET-TRIPLET ENERGY GAPS IN A PUSH-PULL COMPOUND
(AMERICAN INSTITUTE OF PHYSICS, 2003)
Quasiprobability distribution functions for finite-dimensional discrete phase spaces: Spin-tunneling effects in a toy model
(Amer Physical Soc, 2009-02-01)
We show how quasiprobability distribution functions defined over N(2)-dimensional discrete phase spaces can be used to treat physical systems described by a finite space of states which exhibit spin-tunneling effects. This ...
Decay of photo-induced conductivity in Sb-doped SnO2 thin films, using monochromatic light of about bandgap energy
Doping tin dioxide (SnO2) with pentavalent Sb5+ ions leads to an enhancement in the electrical conductivity of this material, because Sb5+ substitutes Sn4+ in the matrix, promoting an electronic density increase in the ...