Journal
PHYSICAL REVIEW A
Volume 103, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.043315
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Funding
- National Natural Science Foundation of China [11975110, 11764022, 11465009, 11947082]
- Zhejiang Provincial Natural Science Foundation of China [LY21A050002, LZ20A040002]
- Scientific and Technological Research Fund of Jiangxi Provincial Education Department [GJJ180559, GJJ180581, GJJ180588, GJJ190549, GJJ190577]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201903]
- Hunan Provincial Natural Science Foundation of China [2017JJ2272]
- Scientific Research Fund of Hunan Provincial Education Department [20A025]
- Changsha Municipal Natural Science Foundation [kq2007001]
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In this study, the tunneling dynamics of a single spin-orbit-coupled atom trapped in an optical lattice subjected to lattice shaking and time-periodic Zeeman field was theoretically explored. It was found that spin-orbit (SO) coupling affects the tunneling dynamics in both multiphoton resonance and far-off-resonance parameter regimes. The results suggest potential applications in spin-based quantum information processing and spintronics device design.
We theoretically explore the tunneling dynamics for the tight-binding 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 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 (multiphoton resonances), we obtain an unexpected 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 intersite 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 intersite 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 spintronics devices.
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