Exploring quantum phase slips in 1D bosonic systems
Exploring quantum phase slips in 1D bosonic systems
复制标题
探索一维玻色子系统中的量子相滑
DOI：
10.1140/epjst/e2016-60381-0
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. D’Errico
中科院分区：
文献类型：
--
作者：
Simona Scaffidi Abbate;L. Gori;M. Inguscio;G. Modugno;C. D’Errico
摘要
量子相滑，即低温下一维超流体的初级激发，在大多数凝聚态物质系统中都得到了很好的表征，但超冷量子气体是一个明显的例外。在这里，我们提出了对沿周期性势流动的一维玻色超流体耗散的实验研究，这显示了量子相滑存在的特征。特别是，通过控制超流体的速度和玻色子之间的相互作用，我们显然能够驱动从热相滑移状态到量子相滑移状态的交叉。要实现对超冷量子气体中量子相滑移的良好控制，需要控制其他现象，例如临界速度下超流性的破坏或强相关区域中莫特绝缘体的出现。在这里，我们展示了我们目前在这些方向上的结果。
Abstract
Quantum phase slips, i.e., the primary excitations in one-dimensional superfluids at low temperature, have been well characterized in most condensed-matter systems, with the notable exception of ultracold quantum gases. Here we present our experimental investigation of the dissipation in one-dimensional Bose superfluids flowing along a periodic potential, which show signatures of the presence of quantum phase slips. In particular, by controlling the velocity of the superfluid and the interaction between the bosons we are apparently able to drive a crossover from a regime of thermal phase slips into a regime of quantum phase slips. Achieving a good control of quantum phase slips in ultracold quantum gases requires to keep under control other phenomena such as the breaking of superfluidity at the critical velocity or the appearance of a Mott insulator in the strongly correlated regime. Here we show our current results in these directions.