کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7938993 1513185 2018 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Donor impurity binding energies of coaxial GaAs/AlxGa1−xAs cylindrical quantum wires in a parallel applied magnetic field
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Donor impurity binding energies of coaxial GaAs/AlxGa1−xAs cylindrical quantum wires in a parallel applied magnetic field
چکیده انگلیسی
Theoretical investigations are carried out of binding energies of a donor charge assumed to be located exactly at the center of symmetry of two concentric cylindrical quantum wires. The intrinsic confinement potential in the region of the inner cylinder is modeled in any one of the three profiles: simple parabolic, shifted parabolic or the polynomial potential. The potential inside the shell is taken to be a potential step or potential barrier of a finite height. Additional confinement of the charge carriers is due to the vector potential of the axial applied magnetic field. It is found that the binding energies attain maxima in their variations with the radius of the inner cylinder irrespective of the particular intrinsic confinement of the inner cylinder. As the radius of the inner cylinder is increased further, the binding energies corresponding to either the parabolic or the polynomial potentials attain minima at some critical core-radius. Finally, as anticipated, the binding energies increase with the increase of the parallel applied magnetic field. This behaviour of the binding energies is irrespective of the particular electric potential of the nanostructure or its specific dimensions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 116, April 2018, Pages 227-237
نویسندگان
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