|Quantum spin-glass transition
in the two-dimensional electron gasSUBIR SACHDEV
Department of Physics,
Yale University, P.O. Box 208120, New Haven, CT 06520-8120, USA
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 spin-glass 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.
Keywords: Spin glasses; quantum phase transition; ferromagnetism; electron gas
Pacs Nos. 73.40.-c; 71.30.+h; 75.10.Jm; 75.10.Nr
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