J an 2 00 3 Testing of two - dimensional local approximations in the current - spin and spin - density - functional theories
نویسنده
چکیده
We study a model quantum dot system in an external magnetic field by using both the spin-density-functional theory and the current-spin-densityfunctional theory. The theories are used with local approximations for the spin-density and the vorticity. The reliabilities of different parametrizations for the exchange-correlation functionals are tested by comparing the ensuing energetics with quantum Monte Carlo results. The limit where the vorticity dependence should be used in the exchange-correlation functionals is discussed. 71. Electronic structure 73.21.La Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems 85.35.Be Quantum well devices (quantum dots, quantum wires, etc.) Typeset using REVTEX
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