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

Abstract

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.

14 pages, 4 figures

References in corpus (7)

• Metal-insulator transition in two-dimensional electron systems
• Phase Diagram of the Low-Density Two-Dimensional Homogeneous Electron Gas
• Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system
• Pauli spin susceptibility of a strongly correlated two-dimensional electron liquid
• High field magneto-transport in high mobility gated InSb/InAlSb quantum well heterostructures
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Dynamic Nuclear Polarization and Nuclear Magnetic Resonance in the Simplest Pseudospin Quantum Hall Ferromagnet

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