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The creation of pseudo-magnetic fields in strained graphene has emerged as apromising route to allow observing intriguing physical phenomena that would beunattainable with laboratory superconducting magnets. Scanning tunnelingspectroscopy experiments have successfully measured the pseudo-Landau levelsand proved the existence of pseudo-magnetic fields in various strained graphenesystems. These giant pseudo-magnetic fields observed in highly deformedgraphene can substantially alter the optical properties of graphene beyond alevel that can be feasible with an external magnetic field, but theexperimental signatures of the influence of such pseudo-magnetic fields haveyet to be unveiled. Here, using time-resolved infrared pump-probe spectroscopy,we provide unambiguous evidence for ultra-slow carrier dynamics enabled bypseudo-magnetic fields in periodically strained graphene. Strongpseudo-magnetic fields of ~100 T created by non-uniform strain in graphenenanopillars are found to significantly decelerate the relaxation processes ofhot carriers by more than an order of magnitude. Our finding presentsunforeseen opportunities for harnessing the new physics of graphene enabled bypseudo-magnetic fields for optoelectronics and condensed matter physics.

Pseudo-magnetic field-induced ultra-slow carrier dynamics in periodically strained graphene