Experiment title: Phase slippage at the interface between CDW blocks moving at different velocities

摘要: A charge density wave (CDW) is a modulation of the conduction electron density associated with a periodic lattice distortion of same periodicity. Below the Peierls transition temperature, the CDW system exhibits a superstructure characterized by satellite diffraction peaks. Above a threshold applied electric field, ET, the CDW, whose phase is normally pinned by randomly distributed impurities, becomes unpinned and begins to slide with respect to the underlying lattice, giving rise to collective electron transport: