Novel A-B type oscillations in a 2-D electron gas in inhomogenous magnetic fields

Abstract

We present results from a quantum and semiclassical theoretical study of the $ρ_{xy}$ and $ρ_{xx}$ resistivities of a high mobility 2-D electron gas in the presence of a dilute random distribution of tubes with magnetic flux $Φ$ and radius $R$, for arbitrary values of $k_f R$ and $F=eΦ/h$. We report on novel Aharonov-Bohm type oscillations in $ρ_{xy}$ and $ρ_{xx}$, related to degenerate quantum flux tube resonances, that satisfy the selection rule ${(k_fR)}^2=4F(n+{1\over 2})$, with $n$ an integer. We discuss possible experimental conditions where these oscillations may be observed.