Controlling directed atomic motion and second-order tunneling of a spin-orbit-coupled atom in optical lattices

• URL: http://arxiv.org/abs/2011.01399v2
• Date: Tue, 2 Feb 2021 07:15:48 GMT
• Title: Controlling directed atomic motion and second-order tunneling of a spin-orbit-coupled atom in optical lattices
• Authors: Xiaobing Luo, Zhao-Yun Zeng, Yu Guo, Baiyuan Yang, Jinpeng Xiao, Lei Li, Chao Kong, and Ai-Xi Chen
• Abstract summary: We show that the spin-orbit (SO) coupling adds some new results to the tunneling dynamics in both multiphoton resonance and far-off-resonance parameter regimes. These results may be relevant to potential applications such as spin-based quantum information processing and design of novel spintronics devices.
• Score: 8.118975693510722
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We theoretically explore the tunneling dynamics for the tight-binding (TB) model of a single spin-orbit-coupled atom trapped in an optical lattice subjected to lattice shaking and to time-periodic Zeeman field. By means of analytical and numerical methods, we demonstrate that the spin-orbit (SO) coupling adds some new results to the tunneling dynamics in both multiphoton resonance and far-off-resonance parameter regimes. When the driving frequency is resonant with the static Zeeman field (multi-photon resonances), we obtain an unexpected new dynamical localization (DL) phenomenon where the single SO-coupled atom is restricted to making perfect two-site Rabi oscillation accompanied by spin flipping.By using the unconventional DL phenomenon, we are able to generate a ratchetlike effect which enables directed atomic motion towards different directions and accompanies periodic spin-flipping under the action of SO coupling. For the far-off-resonance case, we show that by suppressing the usual inter-site tunneling alone, it is possible to realize a type of spin-conserving second-order tunneling between next-nearest-neighboring sites, which is not accessible in the conventional lattice system without SO coupling. We also show that simultaneous controls of the usual inter-site tunneling and the SO-coupling-related second-order-tunneling are necessary for quasienergies flatness (collapse) and completely frozen dynamics to exist. These results may be relevant to potential applications such as spin-based quantum information processing and design of novel spintronics devices.

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