Enhanced Strong Interaction between Nanocavities and p-shell Excitons Beyond the Dipole Approximation

Chenjiang Qian, Xin Xie, Jingnan Yang, Kai Peng, Shiyao Wu, Feilong Song, Sibai Sun, Jianchen Dang, Yang Yu, Matthew J. Steer, Iain G. Thayne, Kuijuan Jin, Changzhi Gu, and Xiulai Xu
Phys. Rev. Lett. 122, 087401 – Published 27 February 2019
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Abstract

Large coupling strengths in exciton-photon interactions are important for the quantum photonic network, while strong cavity–quantum dot interactions have been focused on s-shell excitons with small coupling strengths. Here we demonstrate strong interactions between cavities and p-shell excitons with a great enhancement by the in situ wave-function control. The p-shell excitons are demonstrated with much larger wave-function extents and nonlocal interactions beyond the dipole approximation. Then the interaction is tuned from the nonlocal to the local regime by the wave function shrinking, during which the enhancement is obtained. A large coupling strength of 210μeV has been achieved, indicating the great potential of p-shell excitons for coherent information exchange. Furthermore, we propose a distributed delay model to quantitatively explain the coupling strength variation, revealing the intertwining of excitons and photons beyond the dipole approximation.

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  • Received 6 September 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.087401

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Chenjiang Qian1,2, Xin Xie1,2, Jingnan Yang1,2, Kai Peng1,2, Shiyao Wu1,2, Feilong Song1,2, Sibai Sun1,2, Jianchen Dang1,2, Yang Yu1,2, Matthew J. Steer3, Iain G. Thayne3, Kuijuan Jin1,2, Changzhi Gu1,2, and Xiulai Xu1,2,4,*

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
  • 4Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China

  • *xlxu@iphy.ac.cn

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Issue

Vol. 122, Iss. 8 — 1 March 2019

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