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Yu-Ju Lin

Associate Research Fellow

Yu-Ju Lin
Email: linyj[at]gate.sinica.edu.tw
Office: R211
Tel: +886-2-2366-8242
Lab: 212
Lab Tel: +886-2-2362-4912
Ultracold Atomic Physics Laboratory

Research Interest

  • Ultracold quantum gases with synthetic gauge potentials
  • Manipulation with optical lattices
  • Bose-Einstein Condensation

Research Overview

Dr. Yu-Ju Lin’s laboratory studies spin–orbital-angular-momentum coupling in atomic Bose–Einstein condensates. Dr. Lin uses two co-propagating Raman dressing beams to couple atoms in the hyperfine electronic ground-state manifold, while simultaneously transferring orbital angular momentum (OAM) to the atomic center of mass. One Raman beam is a Gaussian (G) beam, and the other is a Laguerre– Gaussian (LG) beam with a winding number of one. This coupling between the atomic spin and the center-of-mass OAM is referred to as “spin–OAM coupling” (SOAMC). Dr. Lin observed correlations between spin and OAM in Raman-dressed quantum states and characterized their spin textures. Using atoms prepared in the lowest-energy dressed state, an azimuthal synthetic gauge potential acting as effective rotation was created, and the Hess–Fairbank effect was demonstrated, which is an analog of the Meissner effect in superconductors. The gauge field in the stationary Hamiltonian opens a path to investigating rotation properties of atomic superfluids under thermal equilibrium. Using the synthetic azimuthal gauge potential, Dr. Lin further demonstrated the first experimental observation of vortex nucleation in a spinor Bose–Einstein condensate under a radially localized synthetic magnetic field. A large circulating azimuthal velocity field at the condensate center results in a dynamically unstable localized excitation that initiates vortex nucleations. The system shows both dynamical and Landau instabilities, and the observation has reasonable agreement with the time- dependent Gross-Pitaevskii simulations.

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Education

  • B.S., 1999, National Taiwan University, Taiwan
  • Ph.D., 2007, Stanford University, USA

Professional History

  • Postdoctoral Research Associate, Joint Quantum Institute, National Institute of Standards and Technology and the University of Maryland (2007 – 2010)
  • Assistant Research Fellow, IAMS, Academia Sinica (2010 – 2019)
  • Associate Research Fellow, IAMS, Academia Sinica (2019 – present)

Awards & Honors

  • Kenda Foundation Golden Jaden Fellow (2011).
  • Career Development Award, Academia Sinica (2013).
Selected Publications
  1. "Vortex Nucleations in Spinor Bose Condensates under Localized Synthetic Magnetic Fields", L.-R. Liu, S.-C. Wu, T.-W. Liu, H.-Y. Hsu, T.-K. Shen, S.-K. Yip, Y. Kawaguchi, and Y.-J. LinPhys. Rev. Lett. 135, 093401 (2025).
  2. “Rotating atomic quantum gases with light-induced azimuthal gauge potentials and the observation of Hess-Fairbank effect”, P.-K. Chen, L.-R. Liu, M.-J, Tsai, N.-C. Chiu, Y. Kawaguchi, S.-K. Yip, M.-S. Chang and Y.-J. Lin, Phys. Rev. Lett. 121, 250401 (2018).
  3. “Spin-orbital-angular-momentum coupled Bose condensates”, H.-R. Chen, K.-Y. Lin, P.-K. Chen, S.-K. Yip, Yuki Kawaguchi and Y.-J. Lin, Phys. Rev. Lett. 121, 113204 (2018).
  4. “Synthetic gauge potentials for ultracold neutral atoms”, Yu-Ju Lin and I B Spielman, Journal of Physics B: Atomic, Molecular and Optical Physics, 49, 183001 (2016).
  5. “Spin-orbit Coupled Bose-Einstein Condensates”, Y.–J. Lin, K. Jimenez-Garcia and I. B. Spielman, Nature 471, 83 (2011).
  6. “A Synthetic Electric Force Acting on Neutral Atoms”, Y.–J. Lin, R. L. Compton, K. Jimenez-Garcia, W. D. Phillips, J. V. Porto and I. B. Spielman, Nature Physics 7, 531 (2011).
  7. “Synthetic Magnetic Fields for Ultracold Neutral Atoms”, Y.–J. Lin, R. L. Compton, K. Jimenez-Garcia, J. V. Porto and I. B. Spielman, Nature 462, 628 (2009).
  8. “Bose-Einstein Condensate in a Uniform Light-induced Vector Potential”, Y.–J. Lin, R. L. Compton, A. R. Perry, W. D. Phillips, J. V. Porto and I. B. Spielman, Phys. Rev. Lett. 102, 130401 (2009).
  9. “Rapid production of 87Rb BECs in a combined magnetic and optical potential”, Y.–J. Lin, A. R. Perry, R. L. Compton, J. V. Porto and I. B. Spielman, Phys. Rev. A 79, 063631 (2009).
  10. “Resonator-Aided Single-Atom Detection on a Microfabricated Chip”, I. Teper, Y.–J. Lin, and V. Vuletić, Phys. Rev. Lett. 97, 023002 (2006).
  11. “Impact of the Casimir-Polder Potential and Johnson Noise on Bose-Einstein Condensate Stability Near Surfaces”, Y.–J. Lin, I. Teper, C. Chin, and V. Vuletić, Phys. Rev. Lett. 92, 050404 (2004).