超冷偶极费米气体中半导体激子的量子模拟
Quantum Simulation of Semiconductor Excitons in Ultracold Dipolar Fermi Gases
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中文总结 AI 辅助
受TMD半导体激子物理研究启发，研究冷原子系统中激子类似物形成。通过单组分费米子，预测冷原子激子存在，展示用晶格调制光谱观察及量子气体显微镜绘制波函数的方法，为模拟复杂电子态奠定基础。
中文摘要 AI 辅助
受原子级薄过渡金属二硫属化物（TMD）半导体中激子物理研究进展的启发，我们研究了冷原子系统中激子类似物的形成。为此，我们考虑由超冷基态分子或六角形光学晶格中的偶极原子组成的单组分费米子。三角子晶格之间的能量偏移会打开一个带隙，在K/K'点具有简并性，就像在TMD中一样。我们预测了冷原子激子的存在，并表明冷原子使我们能够研究从有效质量模型适用的弱耦合区域到由平带模型描述的强相互作用区域的激子。我们展示了如何使用晶格调制光谱观察这些激子，以及如何使用量子气体显微镜绘制它们的波函数。这项工作坚定地确立了半导体物理量子模拟的概念，为模拟诸如三重子、极化子和激子绝缘体等复杂电子态奠定了基础。
英文摘要
Inspired by the progress on the study of exciton physics in atomically thin transition metal dichalcogenide (TMD) semiconductors, we investigate the formation of analogs of excitons in cold atomic systems. To this end, we consider single-component fermions comprised of ultracold ground-state molecules or dipolar atoms in a hexagonal optical lattice. An energy offset between triangular sublattices opens up a band gap with degeneracies at the K/K' points as in TMDs. We predict the existence of cold atomic excitons and show that cold atoms allow us to study excitons from the weak-coupling regime, where effective mass models apply, to the strong-interaction regime, described by flat-band models. We demonstrate how these excitons can be observed using lattice modulation spectroscopy, and how their wave functions can be mapped out using quantum gas microscopy. Firmly establishing the idea of quantum simulation of semiconductor physics, this work lays the foundation for simulating complex electronic states such as trions, polarons and excitonic insulators.
