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Abstract
We have performed Monte Carlo simulations to determine
current--voltage characteristics of two vortex glass models in two
dimensions. Our results confirm earlier studies which concluded
that there is a zero temperature transition. Additionally we find that,
as the temperature approaches zero, the linear resistance vanishes
exponentially, and the current
scale,
$J_{nl}$, where non-linearities appear in the current--voltage characteristics,
varies roughly as $T^3$. This result is quite different from the prediction
of
conventional flux creep theory in which $J_{nl} \sim T$.
The results for the two models agree quite well with each other,
and also agree fairly well
with recent experiments on very thin films of YBCO.
Figures available on request from peter@mozart.ucsc.edu
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