arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.01679cond-mat.quant-gas
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受驱动光晶格中混合对可调的有效哈密顿量

Effective Hamiltonian with tunable mixed pairing in driven optical lattices

Yu-Biao Wu, Guang-Can Guo, Zhen Zheng, Xu-Bo Zou

摘要:

超冷费米气体中的混合配对可以产生有趣的多体相,例如支持具有各种空间构型的马约拉纳零模(MZM)的拓扑非平凡超流体。不幸的是,在普通晶格系统中,拓扑相位和相关的MZM被占主导地位的$s$ -波配对抑制。在这里,我们提出了一个建议,工程有效的哈密顿与可调的混合在现场和场外配对的基础上驱动光晶格。通过周期性驱动场而不是磁费什巴赫共振,可以独立地改变现场和场外配对。它铺平了道路,抑制占主导地位的现场相互作用,挫败拓扑超流体的出现和合成MZM本地化的边缘或角落。

英文摘要:

Mixed pairing in ultracold Fermi gases can give rise to interesting many-body phases, such as topological nontrivial superfluids that support Majorana zero modes (MZMs) with various spatial configurations. Unfortunately, in ordinary lattice systems, the topological phase and the associated MZMs are suppressed by the dominant $s$-wave pairing. Here we present a proposal for engineering effective Hamiltonians with tunable mixed on- and off-site pairing based on driven optical lattices. The on- and off-site pairing can be changed independently by means of a periodical driving field rather than magnetic Feshbach resonances. It paves the way for suppressing the dominant on-site interaction that frustrates the emergence of topological superfluids and for synthesizing MZMs localized in edges or corners.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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