Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system

Details Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system

2003-01-13

arxiv.org/abs/cond-mat/0301187v1

Phys. Rev. Lett. 91, 046403 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.91.046403

We have accurately measured the effective mass in a dilute two-dimensional electron system in silicon by analyzing temperature dependence of the Shubnikov-de Haas oscillations in the low-temperature limit. A sharp increase of the effective mass with decreasing electron density has been observed. Using tilted magnetic fields, we have found that the enhanced effective mass is independent of the degree of spin polarization, which points to a spin-independent origin of the mass enhancement and is in contradiction with existing theories.

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