2017 Fiscal Year Annual Research Report
Creation of bosonic fractional quantum Hall states in exciton-polaritons
Project/Area Number |
17H04851
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Research Institution | Institute of Physical and Chemical Research |
Principal Investigator |
Fraser Michael 国立研究開発法人理化学研究所, 創発物性科学研究センター, 客員研究員 (10647051)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Keywords | quantum Hall effect / exciton-polariton / quantised vortex |
Outline of Annual Research Achievements |
The initial phase of the project involved significant construction and testing of an experimental apparatus for ultra-fast rotation of an exciton-polariton condensate, and the measurement of the resulting dynamics. This notably included frequency-offset phase locked laser optics, clean Laguerre-Gauss and top-hat profile modes and ultra-fast time-resolved measurements with computer-controlled filtering in real- and momentum-space. Clean, large area polariton condensates are observed. Further, trapping of heavy polaritons to single and lattice potentials using the proton-implantation technique is reported. Finally, numerical simulations of polariton dynamics under optical rotation demonstrate Abrikosov lattice formation, and guiding the experimental design of the optical pump geometry.
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Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
It was anticipated that the construction of new parts of the experiment, particularly due to the complexity of the frequency-offset phase locking optics, would occupy a large part of the first project phase. As all parts of the experiment construction have been successfully constructed, integrated and tested, this phase is considered successful and on-track. The specific new observations in this experiment, including clean, stable high-resolution polariton condensation and the demonstration of confining potentials for heavy polaritons and further, the full numerical simulations of the overall methodology of the project have shown the desired behaviour, concluding the initial phases of the project and providing a sound foundation for the search for quantum Hall effects in the coming year of the project.
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Strategy for Future Research Activity |
With the experiment and preliminary sample fabrication stages of the project complete, the testing of the rotating optical pump now commences. It is anticipated that during the second year of the project, the following results might be obtained:
1. The first observation of driven rotation of a polariton condensate. 2. The study of quantized vortex dynamics, including the effect of open-dissipation. 3. The limits of the system under ultra-fast rotation and the characterisation of dense lattices of quantized vortices. 4. Optimization of experimental and sample parameters to possibly reach the mean-field quantum Hall regime.
These goals will be pursued through refinement of microcavity samples, fabricated trapping profiles and the optical pump profile/rotation velocity.
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Remarks |
The webpage above (1) is that of the research laboratory, and is hosted by RIKEN to specifically publicise the results of this project and on this theme.
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Research Products
(2 results)