XENON100 is currently one of the world leading dark matter direct detection experiments using a dual phase Xenon time projection chamber (TPC). The XENON100 experiment has accumulated more than one year of dark matter search data since February 2011 at a background level of 5.3 events/(keV*tonne*day). Using this data, we have placed the best sensitivity for spin-independent, spin-dependent and inelastic dark matter searches based on nuclear recoils and ruled out the nuclear recoil interpretation of the DAMA/LIBRA annual modulation observation. In this talk, we focus on the recent search of event rate modulations in XENON100 electronic recoil data. This analysis allows to test the interpretation of the long standing DAMA/LIBRA annual modulation observations for certain dark matter models producing electronic recoils. We demonstrate for the first time that long term stability of dual phase Xenon TPC is sufficient to enable searches for modulation signals in the low energy region. We implemented an un-binned profile likelihood analysis to search for modulations signals in XENON100 and make comparison with the DAMA/LIBRA annual modulation observation. The DAMA/LIBRA annual modulation interpreted as signals from several popular dark matter models are excluded. The analysis details as well as future prospective of modulation search combining upcoming XENON100 data will also be presented.                                

Host: Prof. Jianglai Liu