590 research outputs found
Possible Jahn-Teller effect in Si-inverse layers
Jahn-Teller effect in bivalley Si(100) MOSFET under conditions of quantum
Hall effect at integer filling factors nu=1,2,3 is studied. This system is
described by SU(4) hidden symmetry. At nu=2 static and dynamic lattice
deformation creates an easy-plane anisotropy and antiferromagnetic exchange and
lifts the valley degeneracy. At nu=1,3 Coulomb interaction is essential to
produce weak easy-plane anisotropy. Three phases: ferromagnetic, canted
antiferromagnetic and spin-singlet, have been found. Anisotropy energy of
charged skyrmion excitation in every phase is found.Comment: 8 pages, 4 figure
Contractions of low-dimensional nilpotent Jordan algebras
In this paper we classify the laws of three-dimensional and four-dimensional
nilpotent Jordan algebras over the field of complex numbers. We describe the
irreducible components of their algebraic varieties and extend contractions and
deformations among them. In particular, we prove that J2 and J3 are irreducible
and that J4 is the union of the Zariski closures of two rigid Jordan algebras.Comment: 12 pages, 3 figure
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