Absence of a Magnetic Field Induced Metal-Insulator Transition in Kondo Insulators

Details Absence of a Magnetic Field Induced Metal-Insulator Transition in Kondo Insulators Absence of a Magnetic Field Induced Metal-Insulator Transition in Kondo Insulators

1994-12-12

arxiv.org/abs/cond-mat/9412050v1

Physics

Condensed Matter

4 pages (using REVTEX), 2 figures in postscript. Submitted to Physical Review Letters

Scientific paper

We investigate whether or not Kondo insulators undergo a magnetic field induced metal-insulator transition in one dimension at half filling using both a density matrix formulation of the numerical renormalization group and a new analytical approach. Contrary to expectations, the quasiparticle gap never vanishes at any field and no metal-insulator transition is found. We discuss generalizing our result to three dimensions and to the asymmetric Anderson lattice. Our result is consistent with recent experiments.

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