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

Dong-Ho Kang, Hao Sun, Manlin Luo, Kunze Lu, Melvina Chen, Youngmin Kim, Yongduck Jung, Xuejiao Gao, Samuel Jior Parluhutan, Junyu Ge, See Wee Koh, David Giovanni, Tze Chien Sum, Qi Jie Wang, Hong Li and Donguk Nam ()
Additional contact information
Dong-Ho Kang: Nanyang Technological University
Hao Sun: Nanyang Technological University
Manlin Luo: Nanyang Technological University
Kunze Lu: Nanyang Technological University
Melvina Chen: Nanyang Technological University
Youngmin Kim: Nanyang Technological University
Yongduck Jung: Nanyang Technological University
Xuejiao Gao: Nanyang Technological University
Samuel Jior Parluhutan: Nanyang Technological University
Junyu Ge: Nanyang Technological University
See Wee Koh: Nanyang Technological University
David Giovanni: Nanyang Technological University
Tze Chien Sum: Nanyang Technological University
Qi Jie Wang: Nanyang Technological University
Hong Li: Nanyang Technological University
Donguk Nam: Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The creation of pseudo-magnetic fields in strained graphene has emerged as a promising route to investigate intriguing physical phenomena that would be unattainable with laboratory superconducting magnets. The 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 slow carrier dynamics enabled by the pseudo-magnetic fields in periodically strained graphene. Strong pseudo-magnetic fields of ~100 T created by non-uniform strain in graphene on nanopillars are found to significantly decelerate the relaxation processes of hot carriers by more than an order of magnitude. Our findings offer alternative opportunities to harness the properties of graphene enabled by pseudo-magnetic fields for optoelectronics and condensed matter physics.

Date: 2021
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DOI: 10.1038/s41467-021-25304-0

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