Interactions Enable Thouless Pumping in a Nonsliding Lattice,Physical Review X

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Interactions Enable Thouless Pumping in a Nonsliding Lattice
Physical Review X ( IF 11.6 ) Pub Date : 2024-06-20 , DOI: 10.1103/physrevx.14.021049
Konrad Viebahn ₁ , Anne-Sophie Walter ₁ , Eric Bertok ₂ , Zijie Zhu ₁ , Marius Gächter ₁ , Armando A. Aligia ₃ , Fabian Heidrich-Meisner ₂ , Tilman Esslinger ₁

Affiliation

A topological “Thouless” pump represents the quantized motion of particles in response to a slow, cyclic modulation of external control parameters. The Thouless pump, like the quantum Hall effect, is of fundamental interest in physics, because it links physically measurable quantities, such as particle currents, to geometric properties of the experimental system, which can be robust against perturbations and, thus, technologically useful. So far, experiments probing the interplay between topology and interparticle interactions have remained relatively scarce. Here, we observe a Thouless-type charge pump in which the particle current and its directionality inherently rely on the presence of strong interactions. Experimentally, we utilize a two-component Fermi gas in a dynamical superlattice which does not exhibit a sliding motion and remains trivial in the single-particle regime. However, when tuning interparticle interactions from zero to positive values, the system undergoes a transition from being stationary to drifting in one direction, consistent with quantized pumping in the first cycle. Remarkably, the topology of the interacting pump trajectory cannot be adiabatically connected to a noninteracting limit, highlighted by the fact that only one atom is transferred per cycle. Our experiments suggest that Thouless charge pumps are promising platforms to gain insights into interaction-driven topological transitions and topological quantum matter.

中文翻译：

相互作用使得非滑动晶格中的无限制泵浦成为可能

拓扑“无”泵代表了响应外部控制参数的缓慢、循环调制的粒子的量子化运动。与量子霍尔效应一样，无量泵在物理学中具有重要意义，因为它将物理可测量的量（例如粒子电流）与实验系统的几何特性联系起来，而实验系统可以抵抗扰动，因此在技术上有用。到目前为止，探索拓扑结构和粒子间相互作用之间相互作用的实验仍然相对较少。在这里，我们观察到一种 Thouless 型电荷泵，其中粒子电流及其方向性本质上依赖于强相互作用的存在。在实验上，我们在动态超晶格中使用了双组分费米气体，该气体不表现出滑动运动，并且在单粒子状态下仍然微不足道。然而，当将粒子间相互作用从零调整到正值时，系统会经历从静止到朝一个方向漂移的转变，这与第一个周期中的量子泵浦一致。值得注意的是，相互作用的泵轨迹的拓扑不能绝热地连接到非相互作用的极限，这一点通过每个循环仅转移一个原子的事实来强调。我们的实验表明，Thouless 电荷泵是有前途的平台，可以深入了解相互作用驱动的拓扑转变和拓扑量子物质。

更新日期：2024-06-21

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