کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1546480 | 997615 | 2010 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
General Hartree-Fock method and symmetry breaking in quantum dots
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Interaction and correlation effects in quantum dots play a fundamental role in defining both their equilibrium and transport properties. Numerical methods are commonly employed to study such systems. In this paper we present a two-step approach in which a Hartree-Fock method, with explicit symmetry breaking, is followed by a projection technique for symmetry restoration. Three different Hartree-Fock implementations, with an increasing degree of symmetry breaking, are introduced and applied to the study of interacting planar dots with N=3 and 6, electrons in the presence of a perpendicular magnetic field. In addition to the restricted and unrestricted techniques already employed for quantum dots, the general unrestricted Hartree-Fock method is described. It is characterized by a complete breaking of all spatial and spin symmetries and improved energy estimates of the ground state energy. Projection techniques suitable for all three Hartree-Fock methods are introduced, and shown to generate correlated many-body wavefunctions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 42, Issue 3, January 2010, Pages 606-609
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 42, Issue 3, January 2010, Pages 606-609
نویسندگان
Fabio Cavaliere, Umberto De Giovannini,