Possible evidence of a spontaneous spin-polarization in mesoscopic 2D electron systems

Details Possible evidence of a spontaneous spin-polarization in mesoscopic 2D electron systems Possible evidence of a spontaneous spin-polarization in mesoscopic 2D electron systems

2003-10-27

arxiv.org/abs/cond-mat/0310628v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.92.116601

We have experimentally studied the non-equilibrium transport in low-density clean 2D electron systems at mesoscopic length scales. At zero magnetic field (B), a double-peak structure in the non-linear conductance was observed close to the Fermi energy in the localized regime. From the behavior of these peaks at non-zero B, we could associate them to the opposite spin states of the system, indicating a spontaneous spin polarization at B = 0. Detailed temperature and disorder dependence of the structure shows that such a splitting is a ground state property of the low-density 2D systems.

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