Browsing by Subject "2D electron gas"

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    Ground-state energy and compressibility of a disordered two-dimensional electron gas
    (World Scientific Publishing, 2007) Tanatar, Bilal; Subaşı, Ahmet Levent; Esfarjani, K.; Fazeli, S. M.
    Two-dimensional (2D) electron systems in the presence of disorder are of interest in connection with the observed metal-insulator transition in such systems. We use density functional theory in its local-spin density approximation (LSDA) to calculate the ground-state energy of a 2D electron system in the presence of remote charged impurities which up on averaging provides disorder. The inverse compressibility calculated from the ground-state energy exhibits a minimum at a critical density controlled by the disorder strength. Our findings are in agreement with experimental results.
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    Magnetization and spin susceptibility of an interacting two-dimensional electron gas
    (American Institute of Physics, 2007) Subaşı, Ahmet Levent; Tanatar, Bilal
    We study the magnetic behavior and in particular the spin susceptibility of an interacting two-dimensional electron gas in a finite in-plane magnetic field. The total energy of the system is constructed using the recent quantum Monte Carlo simulation based parametrized correlation energy as a function of density, spin polarization, and applied magnetic field. The critical magnetic field to fully spin polarize the system is obtained as a function of the electron density. The spin polarization as a function of the applied field (less than the critical field) for various densities are calculated. The spin susceptibility as a function of the applied field for various densities are calculated. The zero-field value of the spin susceptibility as a function of electron density is compared with relevant experiments.