Topological Pumping in a Floquet-Bloch Band,Physical Review Letters

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Topological Pumping in a Floquet-Bloch Band
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-07-29 , DOI: 10.1103/physrevlett.129.053201
Joaquín Minguzzi ₁ , Zijie Zhu ₁ , Kilian Sandholzer ₁ , Anne-Sophie Walter ₁ , Konrad Viebahn ₁ , Tilman Esslinger ₁

Affiliation

Constructing new topological materials is of vital interest for the development of robust quantum applications. However, engineering such materials often causes technological overhead, such as large magnetic fields, spin-orbit coupling, or dynamical superlattice potentials. Simplifying the experimental requirements has been addressed on a conceptual level—by proposing to combine simple lattice structures with Floquet engineering—but there has been no experimental implementation. Here, we demonstrate topological pumping in a Floquet-Bloch band using a plain sinusoidal lattice potential and two-tone driving with frequencies

ω

and

2 ω

. We adiabatically prepare a near-insulating Floquet band of ultracold fermions via a frequency chirp, which avoids gap closings en route from trivial to topological bands. Subsequently, we induce topological pumping by slowly cycling the amplitude and the phase of the

2 ω

drive. Our system is well described by an effective Shockley model, establishing a novel paradigm to engineer topological matter from simple underlying lattice geometries. This approach could enable the application of quantized pumping in metrology, following recent experimental advances on two-frequency driving in real materials.

中文翻译：

Floquet-Bloch 带中的拓扑泵浦

构建新的拓扑材料对于开发稳健的量子应用至关重要。然而，设计此类材料通常会导致技术开销，例如大磁场、自旋轨道耦合或动态超晶格势。简化实验要求已经在概念层面上得到解决——通过提议将简单的晶格结构与 Floquet 工程相结合——但还没有实验性的实现。在这里，我们使用纯正弦晶格势和频率的双音驱动演示了 Floquet-Bloch 频带中的拓扑泵浦