2018 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 |
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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 | complex potential / rapid rotation / bosonic quantum Hall / quantized vortex / Haldane model |
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| Outline of Annual Research Achievements |
The main achievements in the previous year were based on the development of a new technique for fabricating real and imaginary (loss landscapes) for microcavity polaritons. Through significant iteration and optimisation of sample design and growth we have a suitable sample for the experiments. Secondly, we have optimised fabrication of proton implantation defined potentials (both real and complex), to create necessary trapping potentials including single traps (square and harmonic) and also tightly-bound lattices (e.g. Kagome, honeycomb, square) and topological lattices (by structured open-dissipation). The single traps are essential for the demonstration of topological states by rapid rotation, while the gain-loss landscape potentials realise topological lattice models.
Progress towards demonstrating bosonic quantum Hall states in exciton-polaritons has proceeded on two fronts: (a) The rapid rotation of exciton-polaritons in a harmonic trap, and (b) the construction of fabrication (non-Hermitian) topological lattice models. The first of the two projects has seen progress in the development of a technique to create fabricated harmonic traps, and optimization of top-hat and Laguerre-Gauss modes for rotational pumping. The second project has seen rapid development of the theoretical and sample fabrication aspects, including the theoretical demonstration of a non-Hermitian symmetry-breaking structure, and the design of a topological Kagome lattice using these properties. We have progressed significantly in fabricating this potential in a semiconductor microcavity.
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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
The main challenge in this past fiscal year has been the construction and optimisation of the ideal rapidly rotating optical pumping mode for creating the rapidly rotating condensate. There were some issues with laser stabilisation, as well as creating a clean top-hat mode profile on one of the beams. The other laser, consists of a Laguerre-Gauss mode, which worked well. The creation of a frequency off-set superposition of these two modes was also a considerable challenge. Other aspects of the project, notably, measurement apparatus construction, development of trapping techniques and sample fabrication, as well as numerical analysis are all proceeding at a good pace in line with the proposal.
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| Strategy for Future Research Activity |
Having largely completed sample growth and fabrication, in addition to the experimental apparatus for rotation and characterisation of quantum phases of microcavity polaritons, this fiscal year will focus on further optimization of the optical rotation pump and studying dynamics if quantized vortices in the newly-fabricated samples. We will search for topological phases of exciton-polaritons in both rapidly rotating, trapped polariton condensates, as well as in topological lattices fabricated from complex (gain-loss) landscapes. Techniques including momentum-space filtered imaging, interferometric (phase-space) imaging, Streak camera time dynamics, and optical tomography (edge and bulk state spectra and dynamics), will be used to study topological states by these methods.
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[Journal Article] Single-shot condensation of exciton polaritons and the hole burning effect2018
Author(s)
E. Estrecho, T. Gao, N. Bobrovska, M. D. Fraser, M. Steger, L. Pfeiffer, K. West, T. C. H. Liew, M. Matuszewski, D. W. Snoke, A. G. Truscott, and E. A. Ostrovskaya
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Journal Title
Nature Communications
Volume: 9
Pages: 2944
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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