Hongcheng Ni

Research Professor in Physics, State Key Laboratory of Precision Spectroscopy at East China Normal University

Email: hcni@lps.ecnu.edu.cn

Webpage: https://faculty.ecnu.edu.cn/_s29/nhc_en/main.psp

Dr. Ni is a Junior Research Professor at the State Key Laboratory of Precision Spectroscopy at East China Normal University. His research interests are mainly related to ultrafast and strong-field processes in atoms, molecules, and solids induced, observed, and controlled by ultrashort intense laser pulses. Electric field strengths of such laser pulses can have the same order as the Coulomb fields within an atom or molecule while the pulse durations can be as short as a few femtoseconds or even attoseconds, which have the same time scale as the electronic dynamics in the system. Laser frequencies range from the far-infrared through the optical to the soft X-ray region. His research work usually employs numerical simulations of the time-dependent Schrödinger equation and theoretical investigations using strong-field approximation.

Education Background  

Work Experience

Research Interests

• Ultrafast optics
• Attosecond physics
• Strong-field physics
• Atomic, molecular, and optical physics
• Condensed matter physics

Selected Publications

• H. Ni, S. Brennecke, X. Gao, P.-L. He, S. Donsa, I. Březinová, F. He, J. Wu, M. Lein, X.-M. Tong, and J. Burgdörfer, Theory of subcycle linear momentum transfer in strong-field tunneling ionization, Phys. Rev. Lett. 125, 073202 (2020).
• S. Donsa, I. Březinová, H. Ni, J. Feist, and J. Burgdörfer, Polarization tagging of two-photon double ionization by elliptically polarized XUV pulses, Phys. Rev. A 99, 023413 (2019).
• K. Liu, H. Ni, K. Renziehausen, J.M. Rost, and I. Barth, Deformation of atomic p± orbitals in strong elliptically polarized laser fields: Ionization time drifts and spatial photoelectron separation, Phys. Rev. Lett. 121, 203201 (2018).
• H. Ni, N. Eicke, C. Ruiz, J. Cai, F. Oppermann, N.I. Shvetsov-Shilovski, and L.W. Pi, Tunneling criteria and a nonadiabatic term for strong-field ionization, Phys. Rev. A 98, 013411 (2018).
• H. Ni, U. Saalmann, and J.M. Rost, Tunneling exit characteristics from classical backpropagation of an ionized electron wave packet,  Phys. Rev. A 97, 013426 (2018).
• H. Ni, U. Saalmann, and J.M. Rost, Tunneling ionization time resolved by backpropagation, Phys. Rev. Lett. 117, 023002 (2016).
• J. Su, H. Ni, A. Jaroń-Becker, and A. Becker, Time delays in two-photon ionization, Phys. Rev. Lett. 113, 263002 (2014).
• J. Su, H. Ni, A. Becker, and A. Jaroń-Becker, Numerical simulation of time delays in light-induced ionization, Phys. Rev. A 87, 033420 (2013).
• H. Ni, C. Ruiz, R. Dörner, and A. Becker, Numerical simulations of single-photon double ionization of the helium dimer, Phys. Rev. A 88, 013407 (2013).
• H. Ni, S. Chen, C. Ruiz, and A. Becker, Selection rules in the few-photon double ionization of the helium atom, J. Phys. B 44, 175601 (2011).