光晶格高轨带物理研究进展
Physics of higher orbital bands in optical lattices: a review
摘要：
轨道自由度在理解固体材料的非常规性质中起着基础性的作用。量子原子气体的实验进展表明，光晶格中的高轨道可以用来构建天然晶体之外的奇异模型的量子模拟器，其中出现了复杂的玻色-爱因斯坦凝聚和拓扑半金属等新的多体态。简要介绍了光晶格中的轨道自由度，并对奇异轨道模型和由此产生的多体相进行了综述。实验结果的新阶段进行了讨论。
英文摘要：
Orbital degree of freedom plays a fundamental role in understanding the unconventional properties in solid state materials. Experimental progress in quantum atomic gases has demonstrated that high orbitals in optical lattices can be used to construct quantum emulators of exotic models beyond natural crystals, where novel many-body states such as complex Bose-Einstein condensation and topological semimetals emerge. A brief introduction of orbital degree of freedom in optical lattices is given and a summary of exotic orbital models and resulting many-body phases is provided. Experimental consequences of the novel phases are also discussed.
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