The quantum Hall ferromagnet at high filling factors: A magnetic field induced Stoner transition

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Date

2005

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Advisor

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Journal

Phyical Review B

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Publisher

Cambridge : arXiv

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Link to publishers' Version

http://arxiv.org/abs/cond-mat/0512525

Abstract

Spin splitting in the integer quantum Hall effect is investigated for a series of AlxGa1−xAs/GaAs heterojunctions and quantum wells. Magnetoresistance measurements are performed at mK temperature to characterize the electronic density of states and estimate the strength of many body interactions. A simple model with no free parameters correctly predicts the magnetic field required to observe spin splitting confirming that the appearance of spin splitting is a result of a competition between the disorder induced energy cost of flipping spins and the exchange energy gain associated with the polarized state. In this model, the single particle Zeeman energy plays no role, so that the appearance of this quantum Hall ferromagnet in the highest occupied Landau level can also be thought of as a magnetic field induced Stoner transition.

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Keywords GND

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Article

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publishedVersion

URI

https://oa.tib.eu/renate/handle/123456789/3923

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Physik

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