Nonreciprocal transport of exciton polaritons in a non-hermitian chain
We consider theoretically the dynamics of exciton-polaritons in a zigzag chain of coupled elliptical micropillars subjected to incoherent excitation. The driven-dissipative nature of the system along with the naturally present polarization splitting inside the pillars gives rise to the non-recipr...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/143748 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We consider theoretically the dynamics of exciton-polaritons in a zigzag
chain of coupled elliptical micropillars subjected to incoherent excitation.
The driven-dissipative nature of the system along with the naturally present
polarization splitting inside the pillars gives rise to the non-reciprocal
dynamics, which eventually leads to the non-Hermitian skin effect, where all
the modes of the system collapse to one edge. As a result the polaritons
propagate only in one direction along the chain, independent of the excitation
position, and the propagation in the opposite direction is suppressed. The
system shows fair robustness against the typical disorder present in modern
samples. Finally, using the bistable nature of the polaritons we show that
information encoded in the bistability can be transferred only one way. This
paves the way for compact and robust feedback-free one dimensional polariton
transmission channels without the need for external magnetic field, which are
compatible with proposals for polaritonic circuits. |
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