Quantum Coulomb Glass ? Hartree-Fock Approximation versus Exact Diagonalization
نویسندگان
چکیده
منابع مشابه
The Hartree-Fock Theory for Coulomb Systems
For neutral atoms and molecules and positive ions and radicals, we prove the existence of solutions of the Hartree-Fock equations which minimize the Hartree-Fock energy. We establish some properties of the solutions including exponential falloff.
متن کاملHartree-Fock Approximation and Entanglement
The relation between the correlation energy and the entanglement is analytically constructed for the Moshinsky’s model of two coupled harmonic oscillators. It turns out that the two quantities are far to be proportional, even at very small couplings. A comparison is made also with the 2-point Ising model.
متن کاملA simple approximation beyond Hartree - Fock
The form of a real AT-body fermion wave function when expanded in Slater determinants of natural orbitals is investigated using a computer. I t is found that in the case when the number of natural orbitals is N f 2 there is a considerable reduction in the number of Slater determinants required. This offers the possibility of calculating atomic wave functions which are significantly more accurat...
متن کاملExact Kohn-Sham versus Hartree-Fock in momentum space: Examples of two-fermion systems.
The question of how density functional theory (DFT) compares with Hartree-Fock (HF) for the computation of momentum-space properties is addressed in relation to systems for which (near) exact Kohn-Sham (KS) and HF one-electron matrices are known. This makes it possible to objectively compare HF and exact KS and hence to assess the potential of DFT for momentum-space studies. The systems conside...
متن کاملExact broken-symmetry states and Hartree–Fock solutions for quantum dots at high magnetic fields
Wigner molecules formed at high magnetic fields in circular and elliptic quantum dots are studied by exact diagonalization (ED) and unrestricted Hartree–Fock (UHF) methods with multicenter basis of displaced lowest Landau level wave functions. The broken symmetry states with semi-classical charge density constructed from superpositions of the ED solutions are compared to the UHF results. UHF ov...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: physica status solidi (b)
سال: 1998
ISSN: 0370-1972,1521-3951
DOI: 10.1002/(sici)1521-3951(199801)205:1<233::aid-pssb233>3.0.co;2-b