Restricted and unrestricted Hartree-Fock approaches applied to spherical quantum dots in a magnetic field

被引:1
|
作者
Destefani, C. F. [1 ]
Vianna, J. D. M.
Marques, G. E.
机构
[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Brasilia, Inst Fis, BR-70910900 Brasilia, DF, Brazil
[3] Univ Fed Bahia, Inst Fis, BR-40210340 Salvador, BA, Brazil
关键词
Roothaan-Pople-Nesbet Hartree-Fock; quantum dots; Hund's rule;
D O I
10.1002/qua.20984
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The Roothaan and Pople-Nesbet approaches for real atoms are adapted to quantum dots in the presence of a magnetic field. Single-particle Gaussian basis sets are constructed, for each dot radius, under the condition of maximum overlap with the exact functions. The chemical potential, charging energy, and total spin expected values are calculated, and we have verified the validity of the quantum dot energy shell structure as well as Hund's rule for electronic occupation at zero magnetic field. At finite field, we have observed the violation of Hund's rule and studied the influence of magnetic field on the closed and open energy shell configurations. We have also compared the present results with those obtained within the LS-coupling scheme for low electronic occupation numbers. We focus only on ground-state properties and consider quantum dots populated up to 40 electrons, constructed by GaAs or InSb nanocrystals. (C) 2006 Wiley Periodicals, Inc.
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页码:2090 / 2099
页数:10
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