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Structured complex potentials for designer topological systems and devices in optics

Research Project

Project/Area Number 18F18790
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionInstitute of Physical and Chemical Research
Host Researcher 樽茶 清悟  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, グループディレクター (40302799)
Foreign Research Fellow DEL VALLE INCLAN YAGO BALTASAR  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, 外国人特別研究員
DEL VALLE INCLAN REDONDO YAGO BALTASAR  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, 外国人特別研究員
Project Period (FY) 2018-11-09 – 2021-03-31
Project Status Granted (Fiscal Year 2020)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2020: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2019: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2018: ¥600,000 (Direct Cost: ¥600,000)
Keywordstopological / polariton / non-Hermitian / exciton-polariton / superfluidity / complex lattice / Haldane model
Outline of Annual Research Achievements

Sample fabrication recipe and process has now been optimised, and we have achieved robust control of the spatial resolution and reproducibility of the bi-layer SiO2 patterns used to create non-Hermitian potentials. Samples may now be rapidly designed and fabricated.

Finalised measurements and simulations on superfluid transport in polariton condensates, specifically the effect of small, non-resonant, pulsed perturbations on a large quasi-CW condensate. Directly measured for the first time, the superfluid speed, in agreement with conservative physics. Characterised dynamics of the condensate depletion, and found a previously unreported depletion wave phenomena. This provides new constraints to the underlying relaxation processes and will be useful for dynamical perturbation in the future.

Current Status of Research Progress
Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

Experiments are proceeding well, but development of a fabricated platform for topological and non-Hermitian potentials has been slightly delayed due to the designated plasma etching machine used for removing the SiO2 micropillars not being capable of the processing. We have collaborated with a group in Australia for this step. The virus prevention shutdowns have also delayed the completion of this sample.

We have now refined the process recipe and these issues appear to be solved. We expect to now be able to rapidly fabricate numerous functional samples to satisfy the goals of this research project.

Despite the delays in the sample fabrication, we have completed a related project on the effects on open-dissipation on superfluid dynamics, for which a manuscript is being finalised.

Strategy for Future Research Activity

The first set of functional samples for the project are expected be ready to measure within 2-4 weeks after the institutions reopen. Two samples will be fabricated and spectroscopic measurements conducted in the short term.

The first focuses on Hermitian properties of the polariton wavefunction, with three goals in order of complexity: a calibration of the trapping and coupling strengths; a demonstration of lattice bandstructures; and the creation of three more complex bandstructures (quasicrystals, higher-order topological edge states, and Landau-levels in polaritonic graphene). The second sample design focuses on non-Hermitian aspects, with two goals: calibrating the non-Hermitian coupling strength and demonstrating the controlled emergence of exceptional points in polaritonic graphene.

Report

(2 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report

Research Products

(2 results)

All 2019

All Presentation (2 results) (of which Invited: 2 results)

  • [Presentation] Engineering Non-Hermitian potential landscapes in exciton-polariton microcavities2019

    • Author(s)
      Michael D. Fraser
    • Organizer
      Progress in the Mathematics of Topological States of Matter AIMR, Tohoku University, Katahira Campus, Sendai
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Engineering topological states of exciton-polaritons with non-Hermitian potentials2019

    • Author(s)
      Michael D. Fraser
    • Organizer
      International Workshop Recent Advances in Topological Photonics Korea Center for Theoretical Physics of Complex Systems (PCS) of the Institute for Basic Science, Daejeon, Korea
    • Related Report
      2019 Annual Research Report
    • Invited

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Published: 2018-11-12   Modified: 2021-01-27  

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