The symmetry properties of transport beyond the linear regime in chaotic quantum dots are
investigated experimentally. A component of differential conductance that is antisymmetric in
both applied source-drain bias V and magnetic field B, absent in linear transport, is found to
exhibit mesoscopic fluctuations around a zero average. Typical values of this component
allow a measurement of the electron interaction strength.

The magnetic field symmetry of conductance beyond the linear source-drain bias regime in
open chaotic GaAs quantum dots is experimentally investigated using gate-controlled shape
distortion to gather ensemble statistics. We measure a conductance component $ g_ {B-} $
antisymmetric in perpendicular magnetic field $ B $ which is of the form $\tilde g=\alpha VB $
for source-drain bias voltages $ V $ smaller than the quantum dot level spacing $\Delta $
and for $ B $ smaller than a flux quantum through the device area. Interestingly, according to …