Before joining CSI in 2013, Professor Ge was a postdoctoral associate in the Department of Electrical Engineering at Princeton University. He received his PhD in Physics from Yale University in 2010, and his thesis focused on laser physics in complex and disordered media, including wave-chaotic lasers and random lasers. He was the co-discoverer of Coherent Perfect Absorbers, which was featured in media such as BBC News, New York Times, Scientific American, Nature, and Nature Photonics.
Professor Ge's current research interests include nonlinear and non-Hermitian phenomena in optics and photonics. He received an NSF CAREER award in 2019.
PhD, Yale University
BS, Peking University
Scholarship / Publications
85. “Modern semiclassical laser theory with applications to micro and nanolasers,” H. E. Tureci, A. D. Stone, and L. Ge, solicited by Rev. Mod. Phys.
84. “Direct Observation of Chaos Assisted Tunneling in Silicon Microdisks,” S. Wang, Li Ge*, Q. Song*, et al., submitted to Phys. Rev. Lett. (2020).
83. “Pseudo-chirality: a manifestation of Noether’s theorem in non-Hermitian systems,” J. Rivero and Li Ge, submitted to Phys. Rev. Lett. (2020).
82. “Extraordinary fast forward and backward light in transparent non-Hermitian systems,” L. Zhang, L Ying, Li Ge*, W. Zhao, W Zhang*, submitted to Laser Photon. Rev. (2020).80. “Chiral symmetry in non-Hermitian systems: product rule and Clifford algebra,” J. Rivero and Li Ge, submitted to Phys. Rev. B (2020).
80. “Linear localization of non-Hermitian zero modes,” B. Qi and Li Ge, arXiv:1804.00579 (2018).
79. “Pseudo-Hermitian Transition in Degenerate Nonlinear Four-Wave Mixing,” L. Ge and W. Wan, arXiv:1603.05624 (2016).
78. “Pattern Formation and Strong Nonlinear Interactions in Exciton-Polariton Condensates,” L. Ge, A. Nersisyan, B. Oztop, and H. E. Tureci, arXiv:1311.4847 (2014).
77. “Twisted light on a chip,” L. Ge, Science 368, 707 (2020).
76. “Origin of robust exceptional points: Restricted bulk zero mode,” J. Rivero and Li Ge, Phys. Rev. A 101, 063823 (2020).
75. “Revealing the missing dimension at an exceptional point,” X. Y. Wang, L. Ge*, J. Zhu*, R. M. Ma*, et al., Nature Phys. 16, 571–578 (2020)..
74. "Ultrafast control of vortex microlasers," C. Huang, L. Ge*, Y. Kivshar*, and Q. Song*, et al., Science 367, 1018 (2020).
73. “Synthetic PT and anti-PT symmetry in a single microcavity,” F. Zhang, Y. Feng, L. Ge*, and W. Wan*, Phys. Rev. Lett. 124, 053901 (2020).
72. (Invited review) “Parity-Time Symmetry Synthetic Lasers: Physics and Devices,” B. Qi, H. Chen, L. Ge*, P. Berini*, R. Ma*, Adv. Opt. Mat. 7, 1900694 (2019).
71. “Time-reversal invariant scaling of light propagation in one-dimensional non-Hermitian systems,” J. Rivero and L. Ge, Phys. Rev. A 100, 023819 (2019).
70. “All-optical control of lead halide perovskite microlasers,” N. Zhang, Y. Fan, K. Wang, Z. Gu, Y. Wang, L. Ge*, S. Xiao*, and Q. Song*, Nature Commun. 10, 1770 (2019).
69. (Invited focus article) “Quantum chaos in optical microcavities: A broadband application,” L. Ge, EPL 123, 64001 (2018).
68. “Transporting optical chirality through the dynamical barriers in optical microcavities,” S. Liu, J. Wiersig, W. Sun, Y. Fan, Li Ge, J. Yang, H. Cao, S. Xiao, and Q. Song, Laser Photon. Rev. 2018, 1800027 (2018).
67. “Defect states emerging from a non-Hermitian flat band of photonic zero modes,” B. Qi, L. Zhang, and Li Ge*, Phys. Rev. Lett. 120, 093901 (2018).
66. “Non-Hermitian lattices with a flat band and polynomial power increase [Invited],” Li Ge, Photonics Research 6, A10-A17 (2018).
65. “Stable Switching among High-Order Modes in Polariton Condensates,” Y. Sun, Y. Yoon, S. Khan, Li Ge, M. Steger, L. N. Pfeiffer, K. West, H. E. Tureci, D. W. Snoke, and K. A. Nelson, Phys. Rev. B 97, 045303 (2018).
64. (Invited review) “Non-Hermitian photonics based on parity-time symmetry,” L. Feng, R. El-Ganainy, and Li Ge, Nature Photonics 11, 752-762 (2017) [See also the editorial “Turning loss into gain,” Nature Photonics 11, 741 (2017)].
63. (Editorial) “Optical microcavities: New understandings and developments,” Li Ge, L. Feng, and H. G. L. Schwefel, Photonics Research 5, OM1-OM3 (2017).
62. “Observation of gain spiking and nonlinear beating of optical frequency comb in a Microcavity,” Y. Zheng, T. Qin, J. Yang, X. Chen, Li Ge, and W. Wan, Opt. Express 25, 31140-31147 (2017).
62. “Constructing the scattering matrix for optical microcavities as a nonlocal boundary value problem,” Li Ge, Photonics Research 5, B20 (2017).
61. “Non-Hermitian photonics based on parity-time symmetry,” L. Feng, R. El-Ganainy, and Li Ge, Nature Photonics, in press (2017).
60. “Quasi parity-time symmetric microdisk laser,” N. Zhang, Z. Gu, K. Wang, N. Yi, M. Li, S. Liu, S. Xiao, Li Ge, and Q. Song, Laser Photonics Rev. 1700052 (2017).
59. “Optical fluxes in coupled PT-symmetric photonic structures,” Li Ge, K. G. Makris, and L. Zhang, Phys. Rev. A 96, 023820 (2017).
58. “Anomalous minimum and scaling behavior of localization length near an isolated flat band,” Li Ge, Ann. Phys. (Berlin) 527, 201600182 (2017).
57. “Condensation of thresholds in multimode microlasers,” Li Ge, H. Cao, and A. D. Stone, Phys. Rev. A 95, 023842 (2017).
56. “Symmetry, stability, and computation of degenerate lasing modes,” D. Liu, B. Zhen, Li Ge, F. Hernandez, A. Pick, S. Burkhardt, M. Liertzer, S. Rotter, and S. G. Johnson, Phys. Rev. A 95, 023835 (2017).
55. “Symmetry-protected zero-mode laser with a tunable spatial profile,” Li Ge, Phys. Rev. A 95, 023812 (2017).
54. “Experimental demonstration of spontaneous chirality in a nonlinear microresonator,” Q.-T. Cao, H.-M. Wang, C.-H. Dong, H. Jing, R.-S. Liu, X. Chen, Li Ge, Q. Gong, Y.-F. Xiao, Phys. Rev. Lett. 118, 033901 (2017).
53. “Contrasting eigenvalue and singular-value spectra for lasing and antilasing in a PT-symmetric periodic structure,” Li Ge and L. Feng, Phys. Rev. A 95, 013813 (2017).
52. “Controlling mode competition by tailoring the spatial pump distribution in a laser,” A. Cerjan, B. Redding, Li Ge, S. F. Liew, H. Cao, A. D. Stone, Opt. Express 24, 26006 (2016).
51. “Optical reciprocity induced symmetry in photonic heterostructures and its manifestation in scattering PT symmetry breaking,” Li Ge and L. Feng, Phys. Rev. A 94, 043836 (2016).
50. “Metawaveguide for Asymmetric Interferometric Light-Light Switching,” H. Zhao, W. Fegadolli, J. Yu, Z. Zhang, Li Ge, A. Scherer, and L. Feng, Phys. Rev. Lett. 117, 193901 (2016).
49. “Non-Hermitian engineering of single mode two dimensional laser arrays,” M. H. Teimourpour, Li Ge, D. N. Christodoulides, and R. El-Ganainy, Sci. Rep. 6, 33253 (2016).
48. “Anomalous parity-time symmetry transition away from an exceptional point,” Li Ge, Phys. Rev. A 94, 013837 (2016).
47. “Nonlinear modal interactions in parity-time (PT) symmetric lasers,” Li Ge and R. El-Ganainy, Sci. Rep. 6, 24889 (2016).
46. “Bosonic condensation and disorder-induced localization in a flat band,” F. Baboux, Li Ge, T. Jacqmin, M. Biondi, A. Lemaître, L. Le Gratiet, I. Sagnes, S. Schmidt, H. E. Türeci, A. Amo, and J. Bloch, Phys. Rev. Lett. 116, 066402 (2016).
45. “Controlling a microdisk laser by local refractive index perturbation,” S. F. Liew, Li Ge, B. Redding, G. S. Solomon, and H. Cao, Appl. Phys. Lett. 108, 051105 (2016).
44. “Interaction induced mode switching in microlasers,” Li Ge, D. Liu, S. G. Johnson, S. Rotter, H. E. Tureci, A. Cerjan, H. Cao, A. D. Stone, Optics Express 24, 41 (2016).
43. “Scattering in PT and RT symmetric multimode waveguides: generalized conservation laws and spontaneous symmetry breaking beyond one dimension,” Li Ge, K. Makris, D. Christodoulides, and L. Feng, Phys. Rev. A 92, 062135 (2015).
42. “Selectively excitation of laser modes by controlling modal interactions,” Li Ge, Optics Express 23, 30049 (2015).
41. “Parity-Time symmetry in a flat band system,” Li Ge, Phys. Rev. A 92, 052103 (2015).
40. “Threshold current reduction and directional emission of deformed microdisk lasers via spatially selective electrical pumping,” N. L. Aung, Li Ge, O. Malik, H. E. Tureci, and C. Gmachl, App. Phys. Lett. 107, 151106 (2015).
39. “Supersymetric laser arrays,” R. El-Ganainy, Li Ge, M. Khajavikhan and D. Christodoulides, Phys. Rev. A 92, 033818 (2015).
38. “Inverse Vernier Effect in lasers,” Li Ge and H. E. Tureci, Phys. Rev. A 92, 013840 (2015).
37. “Optical resonances in rotating dielectric microcavities of deformed shape,” R. Sarma, Li Ge, and H. Cao, JOSA B 32, 1736-1742 (2015).
36. “Pump-Controlled Modal Interactions in Microdisk Lasers,” S. F. Liew, Li Ge, B. Redding, G. S. Solomon, H. Cao, Phys. Rev. A 91, 043828 (2015).
35. “Rotation-induced Asymmetry of Far-field Emission from Optical Microcavities,” Li Ge, R. Sarma, and H. Cao, Optica 2, 323-328 (2015).
34. “Rotating optical microcavities with broken chiral symmetry,” R. Sarma, Li Ge, J. Wiersig, and H. Cao, Phys. Rev. Lett. 114, 53903 (2015).
33. “Anomalous transient amplification of waves in non-normal photonic media,” M. K. Makris, Li Ge, and H. E. Tureci, Phys. Rev. X 4, 041044 (2014).
32. “Enhancement of laser power-efficienty by control of spatial hole burning interactions,” Li Ge, O. Malik, and H. E. Tureci, Nature Photonics 8, 871-875 (2014).
31. “A scalable numerical approach for the Steady-State Ab-Initio Laser Theory,” S. Esterhazy, D. Liu, M. Liertzer, A. Cerjan, Li Ge, M. K. Makris, A.D. Stone, J.M. Melenk, S. G. Johnson, and S. Rotter, Phys. Rev. A 90, 023816 (2014).
30. “Parity-time symmetry breaking beyond one dimension: the role of degeneracy,” Li Ge and A. D. Stone, Phys. Rev. X 4, 031011 (2014).
29. “Rotation-induced Mode Coupling in Open Wavelength-scale Microcavities,” Li Ge, R. Sarma, and H. Cao, Phys. Rev. A 90, 013809 (2014).
28. “Active control of emission directionality of semiconductor microdisk lasers,” S. F. Liew, B. Redding, Li Ge, G. S. Solomon, and H. Cao, Appl. Phys. Lett. 104, 231108 (2014).
27. “Exceptional points and lasing self-termination in photonic molecules,” R. El-Ganainy, M. Khajavikhan, and Li Ge, Phys. Rev. A 90, 013802 (2014).
26. “High-order scattering and multipath interference in wavelength-scale optical cavities,” B. Redding, Li Ge, Q. H. Song, G. S. Solomon, and H. Cao, Phys. Rev. Lett. 112, 163902 (2014).
25. “Breaking of PT-symmetry in bounded and unbounded scattering systems,” P. Ambichl, K. G. Makris, Li Ge, Y. D. Chong, A. D. Stone, and S. Rotter, Phys. Rev. X 3, 041030 (2013).
24. “Antisymmetric PT-photonic structures with balanced positive and negative index materials,” Li Ge and H. E. Tureci, Phys. Rev. A 88, 053810 (2013).
23. “Controlling multimode coupling by boundary wave scattering,” Li Ge, Q. H. Song, B. Redding, A. Eberspacher, J. Wiersig, and H. Cao, Phys. Rev. A 88, 043801 (2013).
22. “Formation of long-lived resonances in hexagonal cavities by strong coupling of superscar modes,” Q. H. Song, Li Ge, J. Wersig, and H. Cao, Phys. Rev. A 88, 023834 (2013).
21. “Gain-tunable optomechanical cooling in a laser cavity,” Li Ge, S. Faez, F. Marquardt, and H. E. Tureci, Phys. Rev. A 87, 053839 (2013).
20. “Extreme output sensitivity to subwavelength boundary deformation in microcavities,” Li Ge, Q. H. Song, B. Redding, and H. Cao, Phys. Rev. A 87, 023833 (2013).
19. “Local chirality of optical waves in ultrasmall resonators,” B. Redding, Li Ge, Q. H. Song, J. Wiersig, G. S. Solomon, and H. Cao, Phys. Rev. Lett. 108, 253902 (2012).
18. “Channeling chaotic rays into waveguides for efficient collection of microcavity emission,” Q. H. Song, Li Ge, B. Redding, C. Zeng, G. S. Solomon, and H. Cao, Phys. Rev. Lett. 108, 243902 (2012).
17. “Pump-induced exceptional points in lasers above threshold,” M. Liertzer, Li Ge, C. Cerjan, A. D. Stone, H. E. Tureci, and S. Rotter, Phys. Rev. Lett. 108, 173901 (2012).
16. “Conservation relations and anisotropic transmission resonances in one-dimensional PT-symmetric photonic heterostructures,” Li Ge, Y. D. Chong, and A. D. Stone, Phys. Rev. A 85, 023802 (2012).
15. “Directional waveguide coupling from a wavelength-scale deformed microdisk laser,” B. Redding, Li Ge, G. S. Solomon, and H. Cao, App. Phys. Lett. 100, 061125 (2012).
14. “Steady-state ab initio laser theory for N-level lasers,” A. Cerjan, Y. D. Chong, Li Ge, and A. D. Stone, Optics Express 20, 474-488 (2012).
13. “Wavelength-scale deformed microdisk lasers,” Q. H. Song, Li Ge, J. Wiersig, J.-B. Shim, J. Unterhinninghofen, A. Eberspancher, W. Fang, G. S. Solomon, and Hui Cao, Phys. Rev. A 84, 063843 (2011).
12. “Unconventional modes in lasers with spatially varying gain and loss,” Li Ge, Y. D. Chong, S. Rotter, H. E. Tureci, and A. D. Stone, Phys. Rev. A 84, 023820 (2011).
11. “Time-reversed lasing and control of absorption,” W. Wan, Y. D. Chong, Li Ge, H. Noh, A. D. Stone, and H. Cao, Science 331, 889-892 (2011).
10. “PT-symmetry breaking and laser-absorber modes in optical scattering systems,” Y. D. Chong, Li Ge, and A. D. Stone, Phys. Rev. Lett. 106, 093902 (2011).
9. “Modes of random lasers,” J. Andreasen, A. A. Asatryan, L. C. Botten, M. A. Byrne, H. Cao, Li Ge, L. Labonte, P. Sebbah, A. D. Stone, H. E. Tureci, and C. Vanneste, Advances in Optics and Photonics 3, 88-127 (2011).
8. “Steady-state ab initio laser theory: generalizations and analytic results,” Li Ge, Y. D. Chong, and A. D. Stone, Phys. Rev. A 82, 063824 (2010).
7. “Directional laser emission from a wavelength-scale chaotic microcavity,” Q. Song, Li Ge, A. D. Stone, H. Cao, J. Wiersig, J.-B. Shim, J. Unterhinninghofen, W. Fang, and G. S. Solomon, Phys. Rev. Lett. 105, 103902 (2010).
6. “Coherent perfect absorbers: time-reversed lasers,” Y. D. Chong, Li Ge, H. Cao, and A. D. Stone, Phys. Rev. Lett. 105, 053901 (2010).
5. “Effects of spatially nonuniform gain on lasing modes in weakly scattering random systems,” J. Andreasen, C. Vanneste, Li Ge, and H. Cao, Phys. Rev. A 81, 043818 (2010).
4. “Ab initio self-consistent laser theory and random lasers,” H. E. Tureci, A. D. Stone, Li Ge, S. Rotter, and R. J. Tandy, Nonlinearity 22 C1-C18 (2009).
3. “Strong interactions in multimode random lasers,” H. E. Tureci, Li Ge, S. Rotter, and A. D. Stone, Science 320, 643-646 (2008).
2. “Quantitative verification of ab initio self-consistent laser theory,” Li Ge, R. J. Tandy, A. D. Stone, and H. E. Tureci, Optics Express 16, 16895-16902 (2008).
1. “Theory of the spatial structure of nonlinear lasing modes,” H. E. Tureci, A. D. Stone, and Li Ge, Phys. Rev. A 76, 013813 (2007).