Altshuler-Aronov-Spivak Oscillation in Graphene Antidot lattice

We have observed the Altshuler-Aronov-Spivac (AAS) oscillation in triangular antidot lattice of single layer graphene. Low temperature magnetoresistance exhibited $h/2e$ periodic oscillations near zero magnetic field, negative magnetoresistance, and $h/e$ periodic (AB-type) oscillations at higher magnetic fields. Phase of the AAS oscillation was the same as those for conventional 2D electrons with negligible spin orbit interaction, showing that inter-valley scattering averaged the Berry phase effect which results in anti-localization. (R. Yagi {\it et al}. J. Phys. Soc. Jpn. {\bf 81}, 064707 (2012).)