标题： 一维宇称破缺周期势中的异常布洛赫振荡 显示英文标题

标题： Anomalous Bloch oscillations in one dimensional parity-breaking periodic potentials

摘要： 我们研究在时间缓慢变化且受线性势扰动的一维周期势中波包的动力学。通过考虑每个原胞中的不对称双势阱来打破宇称。通过将半经典动力学的预测与完整的薛定谔解进行比较，我们表明布洛赫振荡强烈受到与贝里相位相关的异常速度修正的影响。我们描述这些效应如何依赖于势的宇称破坏程度以及调制参数。我们还讨论了在重力作用下，如何在非相互作用玻色-爱因斯坦凝聚体在双色光晶格中的当前实验中测量异常速度的影响。 显示英文摘要

摘要： We investigate the dynamics of a wave packet in a parity-breaking one-dimensional periodic potential slowly varied in time and perturbed by a linear potential. Parity is broken by considering an asymmetric double well per unit cell. By comparing the prediction of the semiclassical dynamics with the full Schr\"odinger solution, we show that Bloch oscillations are strongly affected by anomalous velocity corrections related to Berry's phase. We characterize how these effects depend on the degree of parity breaking of the potential and on the modulation parameters. We also discuss how to measure the effects of the anomalous velocity in current experiments with non-interacting Bose-Einstein condensates in bichromatic optical lattices, under the effect of gravity.