Department of Physics & Astronomy

Joshua C. H. Lui

Joshua Lui

Joshua C. H. Lui

Assistant Professor

MS&E 206

Telephone: 951-827-5331
Email: joshua.lui@ucr.edu
Fax: 951-827-4529

Research Group Page

Research Interests:

  • Experimental Condensed Matter Physics
  • Ultrafast Nano-Optics


Ph.D. 2011, Columbia University

Current Research:

Our group explores novel quantum phenomena associated with light-matter interactions in low-dimensional condensed matter systems.  When electrons and phonons are confined in nanometer or atomic scales, they exhibit distinct properties from those in the bulk, such as strong quantum confinement and enhanced many-body interactions.  We aim to elucidate the nature and dynamics of these states by advanced laser spectroscopy.  Our optical techniques include Raman, absorption, luminescence, photocurrent and ultrafast pump-probe spectroscopy, with spectral range from terahertz, infrared, visible to ultraviolet, and time resolution down to femtoseconds. 

Our current research focuses on the investigation of electron, phonon and (pseudo)spin dynamics in two-dimensional (2D) materials, such as graphene, boron nitride, transition-metal dichalcogenides and black phosphorus. These materials exhibit rich physics, such as strong interactions with light, emergent Dirac fermion phenomena, and strongly-correlated states.  Their flat and inert surfaces also enable us to produce heterogeneous stacks of different 2D crystals with atomically sharp interfaces.  These features permit engineering of devices with unprecedented properties.  Given the plethora of 2D materials and potential heterostructures, we expect to identify many new physical phenomena and material properties.

Selected Publications:

Full publication list in Google Scholar

  1. C. H. Lui, L. Liu, K. F. Mak, G. W. Flynn & T. F. Heinz. "Ultraflat graphene", Nature 462, 339-341 (2009) (Link)

  2. C. H. Lui, Z. Q. Li, K. F. Mak, E. Cappelluti & T. F. Heinz. "Observation of an electrically tunable band gap in trilayer graphene", Nature Physics 7, 944-947 (2011) (Link)

  3. C. H. Lui, A. J. Frenzel, D. Pilon, Y. H. Lee, X. Ling, G. M. Akselrod, J. Kong & N. Gedik, “Trion-induced negative photoconductivity in monolayer MoS2”, Phys. Rev. Lett. 113, 166801 (2014) (Link)

  4. C. H. Lui, K. F. Mak, J. Shan & T. F. Heinz. "Ultrafast photoluminescence from graphene", Phys. Rev. Lett. 105, 127404 (2010) (Link)

  5. C. H. Lui, E. Cappelluti, Z. Q. Li & T. F. Heinz. "Tunable infrared phonon anomalies in trilayer graphene", Phys. Rev. Lett. 110, 185504 (2013) (Link)

  6. C. H. Lui, Z. Q. Li, Z. Chen, P. V. Klimov, L. E. Brus & T. F. Heinz. "Imaging stacking order in few-layer graphene", Nano Lett. 11, 164-169 (2010) (Link)

  7. C. H. Lui, L. M. Malard, S. H. Kim, G. Lantz, F. E. Laverge, R. Saito & T. F. Heinz. “Observation of layer-breathing mode vibrations in few-layer graphene through combination raman scattering”, Nano Lett. 12, 5539-5544 (2012) (Link)

  8. C. H. Lui, Z. Ye, C. Keiser, X. Xiao & R. He, “Temperature-activated layer-breathing vibrations in few-layer graphene”, Nano Lett. 14, 4615-4621(2014) (Link)

  9. C. H. Lui & T. F. Heinz. "Measurement of layer breathing mode vibrations in few-layer graphene", Phys. Rev. B (Rapid Communications) 87, 121404(R) (2013) (Link)

  10. C. H. Lui, Z. Ye, C. Ji, K.-C. Chiu, C.-T. Chou, T. I. Andersen, C. Means-Shively, H. Anderson, J.-M. Wu, T. Kidd, Y.-H. Lee & R. He, “Observation of interlayer phonon modes in van der waals heterostructures”, Phys. Rev. B 91, 165403 (2015) (Link)

  11. C. H. Lui, Z. Ye, C. Keiser, E. B. Barros & R. He, “Stacking-dependent shear modes in trilayer graphene”, Appl. Phys. Lett. 106, 041904 (2015) (Link)

More Information

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Physics & Astronomy
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Main Office Tel: (951) 827-5331
Main Office Fax: (951) 827-4529
Maynard, Bonnie; Chair's Assistant, Academic Personnel
E-mail: bonnie.maynard@ucr.edu