کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1812746 1025623 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Theoretical study of positive and negative donor impurity in quantum dot, quantum well limit and quantum wire limit
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Theoretical study of positive and negative donor impurity in quantum dot, quantum well limit and quantum wire limit
چکیده انگلیسی

We compare the binding energy of positive (D+) and negative (D−) charged donor impurities on- and off-center confined in a fully three dimension (3-D) anisotropic cylindrical quantum dot (CQD) with a finite barrier height. Two-parameter anisotropic trial wave function is used, to explore the quantum wire wells (QWW), and the quantum well (QW) limits. A quantitative study for the behavior of the binding energy of D+ and D− is introduced. It has been shown that the donor's binding energies dependent strongly on CQD radius R, and it has been found unexpected behavior of D+. The complex, when D0 bound heavy or light hole to form (Dhh+) or (D1h+), the binding energy is examined. It has been concluded that D1h+ is more bounded (higher binding energy) than Dhh+. Moreover for a certain CQD we have calculated the binding energy of the off-center impurities. It has been found that D+ binding energy increases when impurity ion is moved away from the center of the examined nanostructures, but the D− binding energy decreases when impurity ion moves away from the center.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 405, Issue 2, 15 January 2010, Pages 586–590
نویسندگان
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