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arXiv 1407.0691cond-mat.mes-hallcond-mat.mtrl-sciphysics.atom-ph
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氧化亚铜中的巨里德伯激子

Giant Rydberg Excitons in Cuprous Oxide

Tomasz Kazimierczuk, Dietmar Fröhlich, Stefan Scheel, Heinrich Stolz, Manfred Bayer

摘要:

当一个电子进入具有大主量子数的能级时,高激发态的原子是令人着迷的类氢物体。这些里德伯原子的巨大延伸导致了巨大的相互作用效应。监测这些相互作用为单量子水平上的分子和凝聚态物理问题提供了新的见解。激子是半导体中的基本光学激发,由一个带负电荷的电子和一个带正电荷的空穴组成,是氢的凝聚态类似物。具有类似于里德伯原子的延伸的高度激发的激子是有吸引力的,因为它们可以使用微观势场以高精度在晶体中放置和移动。它们的相互作用可以允许形成有序的激子相或感测周围的元激发,也可以在量子水平上。在这里,我们证明了里德伯激子的存在,在氧化亚铜,CuO,与主量子数大到n=25。这些状态具有超过2微米的巨大波函数扩展,而基态的波函数扩展约为1纳米。强的偶极-偶极相互作用由阻断效应证明,其中激子的存在防止在其附近的另一激子的激发。

英文摘要:

Highly excited atoms with an electron moved into a level with large principal quantum number are fascinating hydrogen-like objects. The giant extension of these Rydberg atoms leads to huge interaction effects. Monitoring these interactions has provided novel insights into molecular and condensed matter physics problems on a single quantum level. Excitons, the fundamental optical excitations in semiconductors consisting of a negatively charged electron and a positively charged hole, are the condensed matter analogues of hydrogen. Highly excited excitons with extensions similar to Rydberg atoms are attractive because they may be placed and moved in a crystal with high precision using microscopic potential landscapes. Their interaction may allow formation of ordered exciton phases or sensing of elementary excitations in the surrounding, also on a quantum level. Here we demonstrate the existence of Rydberg excitons in cuprous oxide, Cu2O, with principal quantum numbers as large as n=25 . These states have giant wave function extensions of more than 2 micrometers, compared to about a nanometer for the ground state. The strong dipole-dipole interaction is evidenced by a blockade effect, where the presence of an exciton prevents excitation of a further exciton in its vicinity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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