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Shallow Deep Transitions of Neutral and Charged Donor States in Semiconductor Quantum Dots | | R. K. Pandey
; Manoj K. Harbola
; Vijay A. Singh
; | | Date: |
2 Aug 2003 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | We carry out a detailed investigation of neutral ($D^0$) and charged ($D^-$) impurity states of hydrogen-like donors in spherical semiconductor quantum dots. The investigation is carried out within the effective mass theory (EMT). We take recourse to local density approximation (LDA) and the Harbola-Sahni (HS) schemes for treating many-body effects. We experiment with a variety of confining potentials: square, harmonic and triangular. We observe that the donor level undergoes shallow to deep transition as the dot radius ($R$) is reduced. On further reduction of the dot radius it becomes shallow again. We term this non-monotonic behaviour extbf{SHADES}. This suggests the possibility of carrier { extbf{ extit{``freeze out’’}}} for both $D^0$ and $D^-$. Further, our study of the optical gaps also reveals a { extbf{SHADES}} transition. | | Source: | arXiv, cond-mat/0308029 | | Services: | Forum | Review | PDF | Favorites | |
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