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Selected Publications

For a full list of my publications, please refer to my google scholar.

Levitated optomechanics

We demonstrated GHz rotation and ultra-sensitive torque detection with an optically levitated nanodumbbell both in free space and near a surface. We performed five-dimensional feedback cooling on an levitated nanodumbbell. We conducted on-chip levitation with both nanofabricated metalens and surface ion trap.

  1. Y. Jin, K. Shen, P. Ju, X. Gao, C. Zu, A. J. Grine and T. Li, ‘Quantum control and fast rotation of levitated diamonds in high vacuum’, arXiv:2309.05821 (2023). [Paper].
  2. P. Ju, Y. Jin, K. Shen, Y. Duan, Z. Xu, X. Gao, X. Ni, T. Li, ‘Near-field GHz rotation and sensing with an optically levitated nanodumbbell’, Nano Letters 23 (22), 10157-10163 (2023). [Paper] [Video]
  3. K. Shen, Y. Duan, P. Ju, Z. Xu, X. Chen, L. Zhang, J. Ahn, X. Ni, T. Li, ‘On-chip optical levitation with a metalens in vacuum’, Optica 8 (11), 1359-1362 (2021). [Paper]
  4. P. Ju, J. Bang, T. Seberson, J. Ahn, Z. Xu, X. Gao, F. Robicheaux, T. Li, ‘Coupled dynamics of an optically levitated nanodumbbell’, Laser Science, LTh2G. 3 (2020). [Paper]
  5. J. Bang, T. Seberson, P. Ju, J. Ahn, Z. Xu, X. Gao, F. Robicheaux, T. Li, ‘Five-dimensional cooling and nonlinear dynamics of an optically levitated nanodumbbell’, Physical Review Research 2 (4), 043054 (2020). [Paper]
  6. J. Ahn, Z. Xu, J. Bang, P. Ju, X. Gao, T. Li, ‘Ultrasensitive torque detection with an optically levitated nanorotor’, Nature Nanotechnology 15 (2), 89-93 (2020). [Paper]

Spin qubit

We studied solid-state spins in 3D (nitrogen-vacancy center in diamond), 2D (Hexagonal boron nitride) and 1D (boron nitride nanotube) materials. We designed and fabricated coplanar waveguide to control electron spins and nuclear spins.

  1. X. Gao, S. Vaidya, S. Dikshit, P. Ju, K. Shen, Y. Jin, S. Zhang, and T. Li, ‘Nanotube spin defects for omnidirectional magnetic field sensing’, arXiv: 2310.02709 (2023). [Paper]
  2. X. Gao, S. Vaidya, K. Li, P. Ju, B. Jiang, Z. Xu, A. Allcca, K. Shen, T. Taniguchi, K. Watanabe, S. A Bhave, Y. P Chen, Y. Ping, T. Li, ‘Nuclear spin polarization and control in hexagonal boron nitride’, Nature Materials 21 (9), 1024-1028 (2022). [Paper]
  3. X. Gao, B. Jiang, A. Allcca, K. Shen, M. A Sadi, A. B Solanki, P. Ju, Z. Xu, P. Upadhyaya, Y. P Chen, S. A Bhave, T. Li, ‘High-contrast plasmonic-enhanced shallow spin defects in hexagonal boron nitride for quantum sensing’, Nano Letters 21 (18), 7708-7714 (2021). [Paper]

Quantum Vaccum Fluctuation

We studied three-body optomechanic system interacting with virtual photons. We simulated virtual photon induced torque between a nanodumbbell and a nanograting.

  1. Z. Xu, P. Ju, X. Gao, K. Shen, Z. Jacob, T. Li, ‘observation of non-contact Casimir friction’, arXiv:2403.06051 (2024). [Paper]
  2. P. Ju, Y. Jin, K. Shen, Y. Duan, Z. Xu, X. Gao, X. Ni, T. Li, ‘Near-field GHz rotation and sensing with an optically levitated nanodumbbell’, Nano Letters 23 (22), 10157-10163 (2023). [Paper] [Video]
  3. Z. Xu, P. Ju, X. Gao, K. Shen, Z. Jacob, T. Li, ‘Observation and control of Casimir effects in a sphere-plate-sphere system’, Nature Communications 13 (1), 1-8 (2022). [Paper]

Talks

  1. ‘GHz rotation and sensing with an optically levitated nanodumbbell near a surface’, SPIE Optics and Photonics (2023). [Video]
  2. ‘Ultrasensitive torque detection and 5D cooling of optically levitated nanoparticles’, APS March meeting (2021). [Link]
  3. ‘Ultrasensitive torque detection with an optically levitated nanorotor’, UniKORN Seminar (2021). [Video]
  4. ‘Coupled dynamics of an optically levitated nanodumbbell’, Laser Science, LTh2G. 3 (2020). [Video]

Posters

  1. ‘Near-field GHz rotation and sensing with an optically levitated nanodumbbel’, GRC, Mechanical Systems in the Quantum Regime (2022). [Link]

Other Experience

Reviewer for Photonics Research, Physics Review A, Optics Letters, Optics Express, Scientific Reports, AIP advances, et al.