Physics – Condensed Matter – Materials Science
Scientific paper
2008-02-04
EXTENDED VERSION in J. Phys.: Condens. Matter 21 (2009) 015304 (6pp)
Physics
Condensed Matter
Materials Science
4 pages, 6 figures
Scientific paper
10.1088/0953-8984/21/1/015304
An external magnetic field, $H$, applied parallel to a quasi two-dimensional system modifies quantitatively and qualitatively the density of states. Using a self-consistent numerical approach, we study how this affects the entropy, $S$, the free energy, $F$, and the magnetization, $M$, for different sheet carrier concentrations, $N_s$. As a prototype system we employ III-V double quantum wells. We find that although $M$ is mainly in the opposite direction of $H$, the system is not linear. Surprisingly $\partial M / \partial H$ swings between negative and positive values, i.e., we predict an entirely orbital diamagnetic to paramagnetic fluctuation. This phenomenon is important compared to the ideal de Haas-van Alphen effect i.e. the corresponding phenomenon under perpendicular magnetic field.
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