Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-11
Europhys. Lett. 68, 93 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, minor corrections, references added
Scientific paper
10.1209/epl/i2004-10174-9
In metallic magnets like MnSi the interplay of two very weak spin-orbit coupling effects can strongly modify the Fermi surface. In the absence of inversion symmetry even a very small Dzyaloshinsky-Moriya interaction of strength delta<<1 distorts a ferromagnetic state into a chiral helix with a long pitch of order 1/delta. We show that additional small spin-orbit coupling terms of order delta in the band structure lead to the formation of exponentially flat minibands with a bandwidth of order exp(-1/sqrt(delta)) parallel to the direction of the helix. These flat minibands cover a rather broad belt of width sqrt(delta) on the Fermi surface where electron motion parallel to the helix practically stops. We argue that these peculiar band-structure effects lead to pronounced features in the anomalous skin effect.
Fischer Ilse
Rosch Achim
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