Quantum spin-glass transition in the two-dimensional electron gas |
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Authors: | Subir Sachdev |
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Institution: | (1) Department of Physics, Yale University, P.O. Box 208120, 06520-8120 New Haven, CT, USA |
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Abstract: | We discuss the possibility of spin-glass order in the vicinity of the unexpected metallic state of the two-dimensional electron
gas in zero applied magnetic field. An average ferromagnetic moment may also be present, and the spin-glass order then resides
in the plane orthogonal to the ferromagnetic moment. We argue that a quantum transition involving the destruction of the spinglass
order in an applied in-plane magnetic field offers a natural explanation of some features of recent magnetoconductance measurements.
We present a quantum field theory for such a transition and compute its mean field properties. |
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Keywords: | Spin glasses quantum phase transition ferromagnetism electron gas |
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