Quantum exceptional chamber induced by large nondipole effect of a quantum dot coupled to a nano-plasmonic resonator
Autor: | Jing-Feng Liu, Xue-Hua Wang, Rongbin Su, Renming Liu, Yu-Wei Lu |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Physics
Exceptional point business.industry plasmon–exciton interaction QC1-999 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Resonator Quantum dot 0103 physical sciences Nano Optoelectronics exceptional point nondipole effect Electrical and Electronic Engineering 010306 general physics 0210 nano-technology business Quantum Plasmon Biotechnology |
Zdroj: | Nanophotonics, Vol 10, Iss 9, Pp 2431-2440 (2021) |
ISSN: | 2192-8614 2192-8606 |
Popis: | Exceptional points (EPs) are the singularities of a non-Hermitian system where the eigenenergies and eigenstates simultaneously coalesce, a topological property that gives rise to a plethora of exotic phenomena. Probing the EPs and associated effects requires the system to go through the EPs. However, the ultrahigh sensitivity of an isolated EP to the external disturbances makes accessing the EPs difficult. To overcome this limit, many approaches have been presented to form the exceptional line/ring and surface. Here, we demonstrate that a quantum exceptional chamber, which is a three-dimensional collection of the EPs, can be constructed in the coupled plasmon-quantum dot (QD) systems by the nondipole effect of the QD. For an asymmetric QD adjacent to a plasmonic nanoparticle, it is found that the contributions of multipole transitions to the coupling strength can be larger than that of dipole transition. The orientation-dependent quantum interference between the dipole and multipole transitions can lead to controllable switch between the weak and strong coupling, and provides an extra degree of freedom to form a high-dimension EP space. Our approach provides a robust platform for accessing the quantum EPs and related applications. |
Databáze: | OpenAIRE |
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