Pseudo-magnetic field-induced ultra-slow carrier dynamics in periodically strained graphene
Abstract
The creation of pseudo-magnetic fields in strained graphene has emerged as a promising route to allow observing intriguing physical phenomena that would be unattainable with laboratory superconducting magnets. Scanning tunneling spectroscopy experiments have successfully measured the pseudo-Landau levels and proved the existence of pseudo-magnetic fields in various strained graphene systems. These giant pseudo-magnetic fields observed in highly deformed graphene can substantially alter the optical properties of graphene beyond a level that can be feasible with an external magnetic field, but the experimental signatures of the influence of such pseudo-magnetic fields have yet to be unveiled. Here, using time-resolved infrared pump-probe spectroscopy, we provide unambiguous evidence for ultra-slow carrier dynamics enabled by pseudo-magnetic fields in periodically strained graphene. Strong pseudo-magnetic fields of ~100 T created by non-uniform strain in graphene nanopillars are found to significantly decelerate the relaxation processes of hot carriers by more than an order of magnitude. Our finding presents unforeseen opportunities for harnessing the new physics of graphene enabled by pseudo-magnetic fields for optoelectronics and condensed matter physics.
Keywords
Cite
@article{arxiv.2107.11973,
title = {Pseudo-magnetic field-induced ultra-slow carrier dynamics in periodically strained graphene},
author = {Dong-Ho Kang and Hao Sun and Manlin Luo and Kunze Lu and Melvina Chen and Youngmin Kim and Yongduck Jung and Xuejiao Gao and Samuel Jior Parluhutan and Junyu Ge and See Wee Koh and David Giovanni and Tze Chien Sum and Qi Jie Wang and Hong Li and Donguk Nam},
journal= {arXiv preprint arXiv:2107.11973},
year = {2021}
}
Comments
Main: 21 pages, 4 figures / SI: 13 pages, 5 figures