Jash Amit, Stern Michael, Misra Subhradeep, Umansky Vladimir, Joseph Israel Bar
Department of Condensed Matter physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
Department of Physics, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Sci Adv. 2024 Aug 16;10(33):eado8763. doi: 10.1126/sciadv.ado8763.
We study the interaction of a dark exciton Bose-Einstein condensate with the nuclei in gallium arsenide/aluminum gallium arsenide coupled quantum wells and find clear evidence for nuclear polarization buildup that accompanies the appearance of the condensate. We show that the nuclei are polarized throughout the mesa area, extending to regions that are far away from the photoexcitation area and persisting for seconds after the excitation is switched off. Photoluminescence measurements in the presence of radio frequency radiation reveal that the hyperfine interaction between the nuclear and electron spins is enhanced by two orders of magnitude. We suggest that this large enhancement manifests the collective nature of the -exciton condensate, which amplifies the interaction by a factor of [Formula: see text].
我们研究了砷化镓/铝镓砷耦合量子阱中暗激子玻色-爱因斯坦凝聚体与原子核的相互作用，并发现了伴随凝聚体出现的核极化积累的明确证据。我们表明，原子核在整个台面区域被极化，延伸到远离光激发区域的地方，并且在激发关闭后持续数秒。在射频辐射存在下的光致发光测量表明，核自旋与电子自旋之间的超精细相互作用增强了两个数量级。我们认为，这种大幅增强体现了暗激子凝聚体的集体性质，它将相互作用放大了[公式：见原文]倍。
