Thursday, May 9, 2013

1305.1826 (Anatoly Kadigrobov et al.)

Peierls-type structural phase transition in a crystal induced by
magnetic breakdown
   [PDF]

Anatoly Kadigrobov, Aleksa Bjelis, Danko Radic
We predict a new type of phase transition in a quasi-two dimensional system of electrons at high magnetic fields, namely the stabilization of a density wave which transforms a two dimensional open Fermi surface into a periodic chain of large pockets with small distances between them. The quantum tunneling of electrons between the neighboring closed orbits enveloping these pockets transforms the electron spectrum into a set of extremely narrow energy bands and gaps which decreases the total electron energy, thus leading to a magnetic breakdown induced density wave (MBIDW) ground state. We show that this DW instability has some qualitatively different properties in comparison to analogous DW instabilities of Peierls type. E. g. the critical temperature of the MBIDW phase transition arises and disappears in a peculiar way with a change of the inverse magnetic field.
View original: http://arxiv.org/abs/1305.1826

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