Asymmetric population of momentum distribution by quasi-periodically driving a triangular optical lattice.

摘要: Ultracold atoms in periodical-driven optical lattices enable us to investigate novel band structures and explore the topology of bands. In this work, we impact ramping process driving signal propose a simple but effective method realize desired asymmetric population momentum distribution by controlling initial phase signal. A quasi-momentum oscillation along shaking direction frame reference co-moving with lattice is formed, causing formation mix ground energy first excited laboratory frame, within regime that frequency far less than coupling between higher This avoids construction intricate or complex control sequence. With triangular lattice, experimentally influence phase, frequency, amplitude on difference observe good agreement our theoretical model. provides guidance how load driven experiment also potentially supplies useful tool form qubit can be used quantum computation.