Hi, this is Ke Lin. I am a 1st year PhD student in Department of Physics, University of California at Berkeley. Please feel free to explore my homepage. If you find something interesting and want to discuss it with me, or collaborate with me on research, feel free to book a zoom meeting here.

News

[09/2024] Work as Graduate Student Researcher at Prof. Dan Stamper-Kurn’s Group.

[08/2024] Started new academic journey as a PhD at the University of California, Berkeley.

[06/2024] Graduated from Shanghai Jiao Tong University with summa cum laude.

[06/2024] Awarded with the honor of Shanghai Outstanding Graduate (top 3%).

[04/2024] Our new paper Chaos-Assisted Dynamical Tunneling in Flat Band Superwires was published in Entropy.

[07/2023] Started new academic journey as an undergraduate research fellow at Harvard University. Worked as a full-time undergraduate research fellow in Prof. Eric Heller’s Group. My project are about superwire in period system.

[02/2023] Started new academic journey as an exchange student at Massachusett Institute of Technology.

[09/2021] Worked as a part-time undergraduate researcher in Prof. Fangwei Ye’s Group. My research topic are realization of 3-Dimensional Branched Flow and Nonlinear Branched Flow.

Publication

(*: Equal Contribution)

Google Scholar

⦁ K. Lin, Z. Y. Liu, J. W. Qin, Q. D. Fu, P. Wang, F. W. Ye, “Observation of Stable Branched Flow of Light in Photorefractive Crystals”, Physical Review Letter (in preparation) Here is the Link.

Anton M. Graf, Ke Lin, MyeongSeo Kim, Joonas Keski-Rahkonen, Alvar Daza, and Eric J. Heller, “Chaos-Assisted Dynamical Tunneling in Flat Band Superwires”, Entropy 2024, 26(6), 492; https://doi.org/10.3390/e26060492

⦁ Z. P. Fu, Z. W. Zhang, K. Lin*, D. Wu, J. Zhang, “Stopping power of high-density alpha-particle clusters in warm dense deuterium-tritium fuels”, Physics of Plasmas 1 July 2023; 30 (7): 072708. https://doi.org/10.1063/5.0156388

Editor’s pick, Featured as a cover

Research Project

• Dynamic tunneling effect of semi-classical superwire

  • Extend study of superwire to three dimension using split-operator method

  • Figure out the difference between superwire and supercolimation beam in Photonics Crystal

  • Find breathing parallel superwire and its analogy with Gaussian wave packet in a harmonic well

  • Add deformation potential in superlattice and find disorder-free superwire

  • Construct band structure of square lattice with Fermi potential and find corresponding flat band in high index band (High Brillouin Zone)

• Branched flow of the light (Zhiyuan Scholar Program, CN$100,000)

  • Part 1: (1+1)D and (2+1)D experimental realization

  • Use Split-Step FFT to simulate branch flow of light in both 2D & 3D random potential field (weak disorder)

  • Construct 2D & 3D, isotropic & anisotropic Gaussian-correlated random potential in a photorefractive SBN:61 crystal

  • Observe both (1+1)D and (2+1)D branched flow in a photorefractive SBN:61 crystal

  • Part 2: Theoretical study of nonlinear branched flow

  • Use Fokker-Planck approach to explain the formation of caustics and branched flow

  • Explain the influence of the non-linear self-trap effect on the characteristics of the branch flow

  • Use 8th Gaussian beam to create initial effective refractive index to verify the non-linear effect

  • Discover smartly non-linear self-routing of soliton propagating in weak disorder random potential

• Nonlinear topological Thouless pumping in optical lattice

  • Mastered the theory of topological insulator, topological photonics and photonics band gap material

  • Stimulate the wave packet transportation in Thouless pumping with different nonlinear amplitude

  • Use MATLAB code calculating band structure for Thouless pumping in one and two dimensions

• Measuring forces with the optical trap

  • Measure the laser’s power-dependent force on water droplets

  • Assemble the self-designed optical trap, use it to capture glass beads and control their motion

  • Use optical trap to measure the twisting force that the bacterial motor (E. coli) generates

Experimental Skill

• Experimental Observation of Branched Flow

  • Create isotropic and anisotropic gaussian-correlated random lattice both in 2D and 3D using optical induction based on a photorefractive SBN:61 crystal

  • Record the light intensity pattern using a charge-coupled device (CCD) at different facet of the crystal

• Measurement of plasmon wavelength on graphene surfaces

  • Use Atomic Force Microscopy (AFM) to measure the thickness of graphene

  • Use Scattering-type Scanning Near-field Optical Microscope (SNOM) to measure the wavelength of graphene surface plasmon resonance

• Measuring forces with the optical trap (optical tweezers)

  • DIY an optical tweezers and assemble the self-designed optical trap

  • Use 5mW Nd: YAG 532nm laser to trap beads and measure the maximum force it generates

• Study of stopping power of α-clusters in warm dense hydrogen

  • Use Tianhe-2 supercomputer to simulate alpha-cluster propagation in Warm Dense Matter (WDM)

  • Explain the influence of alpha-clusters by the interference of wake field

Selected Awards

• Rongchang Scholarship of Science Innovation (Best 10 undergraduates in SJTU, CNY30,000), 2022

• A-Level Scholarship, Shanghai Jiao Tong University (Top 1%), SJTU, 2021&2022

• National Scholarship, Ministry of Education of China, 2021

• Hanyingjuhua Scholarship (Best 15 undergraduates in Zhiyuan Collage, CNY15,000), 2021

• 1st Prize in China Undergraduate Physics academic Tournament (CUPT) First time for SJTU, 2021

  As a leader of the team on behalf of SJTU, won 1st Prize for the first time