Liang Wu

Liang Wu
Standing Faculty

Assistant Professor

Research Areas: Condensed Matter, Ultrafast optics & Terahertz


DRL 2N32

  • Assistant Professor, University of Pennsylvania (July 2018 - present ) ; Leave of absence (July 2017- June 2018)
  • Postdoctoral Fellow, University of California, Berkeley (2016 - 2018)

Honors & Awards:

  • William L. McMillan Award for Outstanding Contributions in Condensed Matter Physics (2019)
  • ARO YIP Award (2019)
  • Forbes "30 under 30" in Science (2018)
  • Michelson Postdoctoral Prize Lectureship (2017)
  • Richard L. Greene Dissertation Award in Experimental Condensed Matter Physics,  American Physical Society (2017)
  • National Scholarship (2008)

Ph.D. Physics, Johns Hopkins University (2015)

M.A. Physics, Johns Hopkins University (2012)

B.S. Physics, Nanjing University (2010)

Research Interests

I am an experimental condensed matter physicist with a strong interest in light-matter interactions.  I develop and utilize time-resolved and nonlinear optical techniques in both the terahertz (THz) and optical frequency regimes to study and control properties of materials broadly known as ''quantum materials’’, which are topological and correlated materials. In this class of matter, collective phases and properties defy a classical description, often leading to an exotically rich range of emergent phenomena.  My research interests include but are not limited to, topological insulators and semimetals, quantum antiferromagnets, 2D materials, quantum spin liquids and topological superconductors.

Courses Taught

Phys 151: Principles of Physics II

Selected Publications
  • Z. Ni, K. Wang, Y. Zhang, O. P. Ocena, X. Han, B. Xu, K. Manna, J. Paglione, C. Felser, A. G. Grushin, F. de Juan, E. J. Mele and Liang Wu* Large topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi. arXiv:2006.09612
  • Z. Ni, B. Xu, Y. Zhang, M. S ́anchez-Mart ́ınez, K. Manna, C. Felser, F. de juan, A.G. Grushin and Liang Wu* Linear and nonlinear optical responses in the chiral multifold semimetal RhSi. arXiv:2005.13473
  • B. Xu, Z. Fang, M. Sanchez-Martınez, J. Vendobos, Z. Ni, K. Manna, K. Wang, J. Paglione, C. Felser, E.J. Mele, A. G. Grushin, A. M. Rappe and Liang Wu* Frequency-resolved multifold fermions in the chiral topological semimetal CoSi. arXiv:2005.01581 to appear in PNAS (2020)
  • D. Khadka, T. R. Thapaliya, S. H. Parra, X.Y. Han, J.J. Wen, J.D. Zang, J. M. Kikkawa, Liang Wu, S. X. Huang. Kondo physics in antiferromagnetic Weyl semimetal Mn3+xSn1-x films. Science Advances  (2020)
  • Y. Jiang, M. M. Asmar, X. Y. Han, M. Ozerov, D. Smirnov, M. Salehi, S. Oh, Z. Jiang, W.-K. Tse, and Liang Wu*. Electron-Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy. Nano Letters 20, 4588 (2020)
  • N. P. Armitage and Liang Wu. On the matter of topological insulators as magneto-electrics. SciPost Phys. 6, 046 (2019) 
  • Liang Wu*, A. Little, E. E. Aldape, D. Rees, E. Thewalt, P. Lampen-Kelley, A. Banerjee, C. A. Bridges, J.-Q. Yan, D. Boone, S. Patankar, D. Goldhaber-Gordo, D. Mandrus, S. E. Nagler, E. Altman, and J. Orenstein. Field evolution of magnons in α-RuCl3 by high-resolution polarized terahertz spectroscopyPhys. Rev. B 98, 094425 (2018)
  • ​S. Patankar, Liang Wu, B. Z. Lu, M. Rai, J. D. Tran, T. Morimoto, D. Parker, A. Grushin, N. L. Nair, J. G. Analytis, J. E. Moore, J. Orenstein, D. H. Torchinsky.  Resonance-enhanced optical nonlinearity in the Weyl semimetal TaAs.  Phys. Rev. B 98, 165113 (2018)
  • T. Higo, H. Man, D. B. Gopman, Liang Wu, Y. P. Kabanov, O. M. J. van’t Erve, D. Rees, Y. F. Li, S. Patankar, M. Ikhlas, C. L. Chien, R. D. Shull, J. Orenstein, and S. Nakatsuji. Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal. Nature Photonics. 12, 73-78 (2018)
  • A. Little†, Liang Wu,*,P. Kelley, A. Banerjee, D. Mandrus, S. Nagler and J. Orenstein. Antiferromagnetic resonance and terahertz continuum in αRuCl3Phys. Rev. Lett.  119, 227201 (2017)
  • Liang Wu*, S. Patankar, T. Morimoto, N. L. Nair, E. Thewalt, A. Little, J. Analytis, J. E. Moore and J. W. Orenstein. Giant anisotropic nonlinear optical response in transition metal monopnictide Weyl semimetals. Nature Physics 13, 350-355 (2017)
  • Liang Wu*, M. Salehi, N. Koirala, J. Moon, S. Oh and N. P. Armitage. Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulatorScience 354, 1124-1127 (2016) 
  • Liang Wu*, W. K. Tse, M. Brahlek, C. M. Morris, R. Valdes Aguilar, N. Koirala, S. Oh and N. P. Armitage. High-resolution Faraday rotation and electron-phonon coupling in surface states of the bulk-insulating topological insulator Cu0.02Bi2Se3Phys. Rev. Lett. 115, 217602 (2015)
  • Liang Wu, M. Brahlek, R. Valdes Aguilar, A. V. Stier, C. M. Morris, Y. Lubashevsky, L. S. Bilbro, N. Bansal, S. Oh, N. P. Armitage. A sudden collapse in transport lifetime through the topological phase transition in (Bi1xInx)2Se3Nature Physics 9, 410-414 (2013)