Angular magnetoresistance oscillations (AMRO) are the oscillations of electric resistance as a function of the magnetic field orientation.  They have been observed in various layered materials, such as organic conductors, intercalated graphite, GaAs superlattices, Sr₂RuO₄, and Tl₂Ba₂CuO₆.  AMRO can be explained in terms of Aharonov-Bohm interference in interlayer electron tunneling.  First we present a theory of AMRO for quasi-two-dimensional bilayers and multilayers [1].  Then we discuss the quasi-one-dimensional case, where the layers consist of parallel chains [2].   The latter theory applies to organic conductors (TMTSF)₂X and is also related to biased Josephson junctions.  The interference effects are limited by decoherence due to loss of phase memory.

[1] V. M. Yakovenko and B. K. Cooper, cond-mat/0507120, to appear in Physica E.

[2] B. K. Cooper and V. M. Yakovenko, Phys. Rev. Lett. 96, 037001 (2006).

Last updated on Monday, 27 March 2006 by Victor Yakovenko