MRS Meetings and Events


QT01.10.02 2024 MRS Spring Meeting

Light Control of Charge Transport and Phase Transitions

When and Where

May 9, 2024
10:30am - 11:00am




Sheng Meng1

Chinese Academy of Sciences1


Sheng Meng1

Chinese Academy of Sciences1
Photoexcitation is a powerful means in distinguishing different interactions and manipulating the properties of matter, especially for charge transport and phase transitions in complex quantum systems.<br/>Here we show that laser-controlled coherent phonon excitation enables orders of magnitude enhancement of carrier mobility via accelerating polaron transport in a prototypical material, lithium peroxide (Li2O2). The selective excitation of specific phonon modes, whose vibrational pattern directly overlap with the polaronic lattice deformation, can remarkably reduce the energy barrier for polaron hopping. The strong nonadiabatic couplings between the electronic and ionic subsystem play a key role in triggering charge transport. These results extend our understanding of charge transport dynamics to the nonequilibrium regime and allow for optoelectronic devices with ultrahigh on-off ratio and ultrafast responsibility competitive with those of state-of-the-art devices. We also investigate photoexcitation induced ultrafast phase-transition dynamics in two-dimensional materials, where we identify a laser-induced collective pathway from 2H phase to 1T phase in MoTe2 that is significantly different from thermal phase transitions. Our results provide insights from a new perspective on the coherent electron and lattice quantum dynamics in materials upon photoexcitation.<br/> <br/>References:<br/>H.M. Wang, X.B. Liu, S.Q. Hu, D.Q. Chen, Q. Chen, C. Zhang, M.X. Guan, S. Meng. Giant acceleration of polaron transport by ultrafast laser-induced coherent phonons. Science Advances 9, eadg3833 (2023).<br/>R.J. Zhao, P.W. You, S. Meng, Ring polymer molecular dynamics with electronic transitions, Phys. Rev. Lett. 130, 166401 (2023).<br/>C.Y. Wang, X.B. Liu, Q. Chen, D.Q. Chen, Y.X. Wang, S. Meng. Coherent-Phonon-Driven Intervalley Scattering and Rabi Oscillation in Multivalley 2D Materials. Phys. Rev. Lett. 131, 066401 (2023).<br/>M.X. Guan, X.B. Liu, D.Q. Chen, X.Y. Li, Y.P. Qi, Q. Yang, P.W. You, S. Meng. Optical control of multi-stage phase transition via phonon couplings in MoTe2. Phys. Rev. Lett. 128, 015702 (2022).<br/>J.Y. Xu, D.Q. Chen, S. Meng. Decoupled ultrafast electronic and structural phase transitions in photoexcited monoclinic VO2. Science Advances 8, eadd2392 (2022).


nonlinear effects | spectroscopy | van der Waals

Symposium Organizers

Chartanay Bonner, The Joint School of Nanoscience and Nanoengineering
Lisa Neshyba, University of Washington, Chemistry Department
Kristen Rahilly, Oregon State University
Michael Scheibner, University of California, Merced

Publishing Alliance

MRS publishes with Springer Nature