Tunneling into Ferromagnetic Quantum Hall States: Observation of a Spin Bottleneck

Details Tunneling into Ferromagnetic Quantum Hall States: Observation of a Spin Bottleneck Tunneling into Ferromagnetic Quantum Hall States: Observation of a Spin Bottleneck

1999-05-26

arxiv.org/abs/cond-mat/9905371v1

Phys. Rev. Lett. 83 (1999) 3258

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.83.3258

We explore the characteristics of equilibrium tunneling of electrons from a 3D electrode into a high mobility 2D electron system. For most 2D Landau level filling factors, we find that tunneling can be characterized by a single, well-defined tunneling rate. However, for spin-polarized quantum Hall states (nu = 1, 3 and 1/3) tunneling occurs at two distinct rates that differ by up to 2 orders of magnitude. The dependence of the two rates on temperature and tunnel barrier thickness suggests that slow in-plane spin relaxation creates a bottleneck for tunneling of electrons.

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