Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-18
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages 5 figures
Scientific paper
Recent thermodynamic measurements on two-dimensional (2D) electron systems have found diverging behavior in the magnetic susceptibility and appearance of ferromagnetism with decreasing electron density. The critical densities for these phenomena coincide with the metal-insulator transition recorded in transport measurements. Based on density functional calculations within the local spin-density approximation, we have investigated the compressibility and magnetic susceptibility of a 2D electron gas in the presence of remote impurities. A correlation between the minimum in the inverse capacitance ($\partial\mu /\partial n$) and the maximum of magnetization and magnetic susceptibility is found. Based on values we obtain for the inverse participation ratio, this seems to be also the MIT point.
Esfarjani Keivan
Fazeli Sayyed Mahdi
Tanatar B.
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