Protocols for dynamically probing topological edge states and dimerization with fermionic atoms in optical potentials
Protocols for dynamically probing topological edge states and dimerization with fermionic atoms in optical potentials
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在光势中动态探测拓扑边缘态和费米子原子二聚化的协议
DOI：
10.1209/0295-5075/118/56004
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. Chien
中科院分区：
文献类型：
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作者：
Mekena Metcalf;Chen;K. Wright;C. Chien
在包含超冷原子的量子系统中观察到了拓扑行为。然而，冷原子的背景谐波陷阱阻碍了直接检测边界处产生的拓扑边缘态，因为畸变将边缘态融合到体中。我们提出了实验上可行的协议，探测局部边缘状态和超冷费米子的二聚。通过将冷原子限制在环形晶格中，并使用非共振激光片切开环，将边界条件从周期性改变为开放性，可以产生拓扑边缘态。当系统随时间演化时，拓扑结构中的晶格可以捕获在边缘释放的单个粒子。或者，耗尽最初填充的晶格远离边界揭示了被占用的边缘状态。在接触相互作用的存在下的二聚化的签名可以发现在选定的相关性作为系统边界突然从周期性的开放变化，并表现出记忆效应的初始状态区分不同的配置。
Topological behavior has been observed in quantum systems including ultracold atoms. However, background harmonic traps for cold atoms hinder the direct detection of topological edge states arising at the boundary because the distortion fuses the edge states into the bulk. We propose experimentally feasible protocols to probe localized edge states and dimerization of ultracold fermions. By confining cold atoms in a ring lattice and changing the boundary condition from periodic to open using an off-resonant laser sheet to cut open the ring, topological edge states can be generated. A lattice in a topological configuration can trap a single particle released at the edge as the system evolves in time. Alternatively, depleting an initially filled lattice away from the boundary reveals the occupied edge states. Signatures of dimerization in the presence of contact interactions can be found in selected correlations as the system boundary suddenly changes from periodic to open and exhibit memory effects of the initial state distinguishing different configurations.