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Many body physics and quantum optics for quantum gases and artificial atoms

 I. Coordinator:

  • Ray-Kuang Lee (李瑞光 NTHU)
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II. Core Members:

  • Core members
  • Daw-Wei Wang (王道維 NTHU), Wen-Chin Wu (吳文欽 NTNU), Shih-Chuan Gou (郭西川 NCUE), Wen-Te Liao (廖文德 NCU) Shin-Tza Wu (吳欣澤 National Chung-Cheng University), Watson Kuo (郭華丞 National Chung-Hsin University)
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  • Young participants
  • Postdocs
  • Dr. You-Lin Chuang (NCTS), Dr. Shiue-Yuan Shiau (NCTS), Dr. Popo Yang (NTHU), Dr. Qing Xu (NTHU), Dr. I.-Kang Liu (NCUE), Dr. Vanna Chrismas Silalahi (NCHU)
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  • PhD. Students
  • Mr. Raul Robles-Robles, Mr. Mohammad Ibrahim, Miss Yi-Ru Chen, Mr. Yu-Han Chang
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III.
Introduction to the research theme and possible collaboration:

  • Recently there are increasing interests in studying cold atom system and related atomlight interaction. Synthetic gauge field with spin-orbital coupling, topological states, non-equilibrium dynamics, and polariton formations in quantum gases are actively investigated among core members in this Thematic Group. Combined with the interdisciplinary area from many-body physics and quantum optics, this Thematic Group provides a versatile platform for our Atomic-Molecular-Optics society to study a variety of quantum gases, including quantum Fermi gases, polar molecules, Rydbergdressed Bose-Einstein Condensates, and superconducting Josephson junctions.
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  • In this proposal, we are going to study a variety of quantum gases, including quantum Fermi gases, polar molecules, Rydberg-dressed Bose-Einstein Condensates, and superconducting Josephson junctions, with emphases on the exotic phenomena due to the intrinsic two/three-bodies interaction. Related nonlinear dynamics, collective excitation, manipulation, spontaneous synchronization in quantum domain and collaboration with experimental groups are all of high interests in the direction of research agenda.
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  • Below we list two main research themes, which have been implemented among our core members
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  • Many-body Physics
  • Using quantum gases, including spinor and Rydberg-dressed Bose-Einstein condensates, as an accessible platform for the studies on quantum phase transitions, topological orders, quantum spontaneous synchronization and Abelian/non- Abelian gauge potentials. Supersolidity, Anderson localization, and quantum turbulence in ultracold Bose system with long-range interaction. We have developed a series of mean-field approach to investigate the superfluidity and FFLO phases of a fermionic dipolar atoms or molecules loaded in a bilayer or multilayer system. Different from previous superfluid problem with short-ranged interaction, the long-ranged interaction enhances p-wave components in the scattering channel, so that the critical temperature should be greatly enhanced. Besides, multi-layer structure makes it easier to realize Coopers between more than two components and as a result, more interesting many-body phase diagrams are expected to be found. Similar but richer results can be also expected for Rydberg atoms.
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  • Quantum Optics
  • Studying nonlinear dynamics, collective excitation, soliton/vortex formations, optomechanical coupling between x-ray and optical photons, superradiance in soft x-ray domain and storage/retrieval of quantum information through the interface of atom-light interaction.
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  • (i)Daw-Wei Wang and Pochung Chen on Quantum Monte Carlo study of strongly interacting systems.
    (ii) Shih-Chuan Gou, Daw-Wei Wang, Wen-Te Liao, and Ray-Kuang Lee had worked with experimental group headed by Ite Yu (余怡德, NTHU) on slow light and Rydberg-dressed EIT, both experimentally and theorically.
    (iii) Wen-Chin Wu and Ray-Kuang Lee on supersolidity and solitons in ultracold Bose system with long-range interaction.
    (iv) Wen-Chin Wu with Makoto Tsubota (Osaka City University, Japan) on quantum turbulence in ultracold Bose system with long-range interaction
    (v) Daw-Wei Wang, Pochung Chen, and Ming-Chiang Chung had worked with Miguel Cazalilla (米格爾, NTHU) on the development of a various theory on strongly interacting quantum gases.
    (vi) Wen-Te Liao and Shih-Chuan Gou had worked together on matter-wave superradiance.
    (vii) Ray-Kuang Lee, Dr. You-Lin Chuang, and Dr. Qing Xu had worked on the correlation functions and quantum heat engineer through light-atom interactions.
    (viii) Daw-Wei Wang had worked with G. Shlyapnikov (LPTMS, France), Gediminas Juzeliunas (Vilnius), F. Cinti (NITheP, South Africa), and Shih- Chuan Gou on non-equilibrium condensates.
 

 

IV. Activities:

  • (1) Visitors and International Collaborations
  • i Regular visitors:
    • 1. Prof. Gediminas Juzeliunas (Institute of Theoretical Physics and Astronomy, Vilnius Universi, Lithuania) [Prof. Juzeliunas has become one of NCTS regular visiting scientist.]
    • 2. Prof. Cheng Chin (Chicago University);
    • 3. Prof. Wang Gang (Soochow University, China)
    • 4. Prof. Claudio Conti (Institute for Complex Systems, National Research Council (ISC-CNR) Italy)
    • 5. Prof. Min-Hsiu Hsieh (Unisersity of Technology, Sydney, Australia)
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  • ii Short-term visitors:
    • 1. Prof. Nick Proukakis (Joint Quantum Centre Durham–Newcastle, School of Mathematics and Statistics, Newcastle University, UK)
    • 2. Prof. Joachim Brand (Dodd-Walls Centre for Photonics and Quantum Technology and Centre for Theoretical Chemistry and Physics, New Zealand Institute for Advanced Study, Massey University, Auckland, New Zealand)
    • 3. Prof. Conjun Wu (Department of Physics, University of California, San Diego, California, USA)
    • 4. Prof. Ashton Bradley (University of Otago, Dunedin, New Zealand)
    • 5. Prof. Bo Xiong, (Wuhan University of Science and Technology, China)
    • 6. Prof. Zia ud din (COMSATS Institute of Information Technology, Pakistan)
    • 7. Prof. Ruseckas, Julius (Vilnius University, Lithuania)
    • 8. Prof. Da-Wei Wang (Zhejiang University, China)
    • 9. Prof. Luis Sanchez-Soto (Max-Planck Institute for the Science of Light,Germany)
    • 10. Prof. Akira Furusawa (The University of Tokyo, Japan)
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  • (2) Mini-schools(one-day), workshops (two-days), or summer/winter schools targeting at students, postdoctoral associates, junior scientists, or/and established members of the TG.
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  • Since 2004, the original AMO FG has started the annual summer school to serve the whole AMO community in Taiwan. In order to train students better, most of the invited speakers are from local institution, covering all AMO fields, including cold atoms, quantum optics, atto-second and high field physics, laser spectroscopy, atomic theory, precision measurement, and quantum manipulation etc. We also have a good tradition for Student Session, where good PhD students and/or postdocs can introduce their research to other students. Young students can learn more by freely discussing with their senior brothers/sisters.
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  • In this proposal, we would continue to host 16th NCTS Summer School on AMO Physics in 2018, respectively. Workshops on gauge potentials, polar molecules, and Rydberg-dressed Bose-Einstein condensates are planning to host with our international visitors.
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VExpected achievement:

  • Through this Thematic Group on Quantum gases, we would like to provide a solid theoretical background in the experimentally accessible regime and predict interesting physics to be observe, leading the development in this new area. We would expect to have more strong collaborations in this community, also with experimental groups in Taiwan, and to enhance the research quality via international collaboration.


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