Nonlinear magnetic field dependence of spin polarization in high density two-dimensional electron systems

Details Nonlinear magnetic field dependence of spin polarization in high density two-dimensional electron systems Nonlinear magnetic field dependence of spin polarization in high density two-dimensional electron systems

2010-06-08

arxiv.org/abs/1006.3456v2

New Journal of Physics 13 (2011) 083010

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 4 figures

Scientific paper

10.1088/1367-2630/13/8/083010

The spin polarization (P) of high-density InSb two-dimensional electron systems (2DESs) has been measured using both parallel and tilted magnetic fields. P is found to exhibit a superlinear increase with the total field B. This P-B nonlinearity results in a difference in spin susceptibility between its real value Xs and Xgm ~ m*g*(m* and g* are the effective mass and g factor, respectively) as routinely used in experiments. We demonstrate that such a P-B nonlinearity originates from the linearly P-dependent g* due to the exchange coupling of electrons rather than from the electron correlation as predicted for the low-density 2DES.

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