Shayan Kamran, Liu Na, Cupo Andrew, Ma Yichen, Luo Yue, Meunier Vincent, Strauf Stefan
Department of Physics , Stevens Institute of Technology , Hoboken , New Jersey 07030 , United States.
Center for Quantum Science and Engineering , Stevens Institute of Technology , Hoboken , New Jersey 07030 , United States.
Nano Lett. 2019 Oct 9;19(10):7301-7308. doi: 10.1021/acs.nanolett.9b02920. Epub 2019 Sep 26.
The realization of on-chip quantum networks requires tunable quantum states to encode information carriers on them. We show that CrGeTe (CGT) as a van der Waals ferromagnet can enable magnetic proximity coupling to site-controlled quantum emitters in WSe, giving rise to ultrahigh exciton factors up to 20 ± 1. By comparing the same site-controlled quantum emitter before and after ferromagnetic proximity coupling, we also demonstrate a technique to directly measure the resulting magnetic exchange field (MEF) strength. Experimentally determined values of MEF up to 1.2 ± 0.2 meV in the saturation regime approach the theoretical limit of 2.1 meV that was determined from density functional theory calculations of the CGT/WSe heterostructure. Our work extends the on-chip control of magneto-optical properties of excitons via van der Waals heterostructures to solid-state quantum emitters.
片上量子网络的实现需要可调谐量子态来在其上编码信息载体。我们表明，作为范德华铁磁体的CrGeTe（CGT）能够实现与WSe中位点控制量子发射器的磁近邻耦合，产生高达20±1的超高激子因子。通过比较铁磁近邻耦合前后的同一位点控制量子发射器，我们还展示了一种直接测量所得磁交换场（MEF）强度的技术。在饱和状态下，实验确定的MEF值高达1.2±0.2 meV，接近通过CGT/WSe异质结构的密度泛函理论计算确定的2.1 meV的理论极限。我们的工作将通过范德华异质结构对激子磁光特性的片上控制扩展到固态量子发射器。
