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首页> 外文期刊>Physical Review X >Interaction-Assisted Reversal of Thermopower with Ultracold Atoms
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Interaction-Assisted Reversal of Thermopower with Ultracold Atoms

机译：用超级原子互动逆转热电驱

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We study thermoelectric currents of neutral, fermionic atoms flowing through a mesoscopic channel connecting a hot and a cold reservoir across the superfluid transition. The thermoelectric response results from a competition between density-driven diffusion from the cold to the hot reservoir and the channel favoring transport of energetic particles from hot to cold. We control the relative strength of both contributions to the thermoelectric response using an external optical potential in a nearly noninteracting and a strongly interacting system. Without interactions, the magnitude of the particle current can be tuned over a broad range but is restricted to flow from hot to cold in our parameter regime. Strikingly, strong interparticle interactions additionally reverse the direction of the current. We quantitatively model ab?initio the noninteracting observations and qualitatively explain the interaction-assisted reversal by the reduction of entropy transport due to pairing correlations. Our work paves the way to studying the coupling of spin and heat in strongly correlated matter using spin-dependent optical techniques with cold atoms.
机译：我们研究中性的热电电流，流过的中性的，流过介质通道，其在超流过渡横跨超流过渡的介质通道。热电响应由密度驱动扩散之间的竞争从冷到热藏的竞争和热量储存的通道从热到冷。我们在几乎不交换的外部光电位和强烈相互作用的系统中使用外部光学电位控制两种贡献对热电响应的相对强度。在没有相互作用的情况下，可以在宽范围内调谐粒子电流的大小，但是仅限于参数制度中从热到冷流动。尖锐的，强的晶间相互作用另外反转电流的方向。我们定量地模拟AB？Initio非交互观察和定性地解释通过对相关性引起的熵传输的减少来解释相互作用的逆转。我们的工作铺平了使用具有冷原子的旋转依赖性光学技术来研究旋转和热量的旋转和热的耦合。

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