Quantum Beats in Hybrid Metal鈥揝emiconductor Nanostructures

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• 作者：Chandriker Kavir Dass ; Thomas Jarvis ; Vasyl P. Kunets ; Yuriy I. Mazur ; Gregory G. Salamo ; Christoph Lienau ; Parinda Vasa ; Xiaoqin Li
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：2
• 期：9
• 页码：1341-1347
• 全文大小：481K
• ISSN：2330-4022

文摘

We investigate nonradiative quantum coherence in the presence of coupling between excitons and surface plasmon polaritons (SPPs) in a hybrid metal鈥搒emiconductor nanostructure. In particular, we study how quantum coherence between heavy-hole (HH) and light-hole (LH) excitons in a GaAs quantum well (QW) is modified when they are coupled to SPPs of a gold grating. We find that the nonradative coherence is reduced in correlation with the coupling strength between the excitons and SPPs. Under the resonant coupling condition, the nonradiative coherence remains in the range of hundreds of femtoseconds, which is significantly longer than the plasmonic coherence. These experiments directly probe quantum dynamics in a prototypical hybrid system and provide critical information for exploring future quantum plasmonics applications.