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

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...

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Bibliographic Details
Published in:Nature communications 2021-08, Vol.12 (1), p.5087-5087, Article 5087
Main Authors: Kang, Dong-Ho, Sun, Hao, Luo, Manlin, Lu, Kunze, Chen, Melvina, Kim, Youngmin, Jung, Yongduck, Gao, Xuejiao, Parluhutan, Samuel Jior, Ge, Junyu, Koh, See Wee, Giovanni, David, Sum, Tze Chien, Wang, Qi Jie, Li, Hong, Nam, Donguk
Format: Article
Language:English
Subjects:
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147/3
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Condensed matter physics
Deceleration
Graphene
Humanities and Social Sciences
Magnetic fields
Magnetic properties
Magnetism
multidisciplinary
Optical properties
Optoelectronics
Science
Science (multidisciplinary)
Superconducting magnets
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Summary: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. The effect of strain-induced pseudo-magnetic fields on the optical properties of graphene has not been experimentally explored yet. Here, pseudo-magnetic fields reaching values of 100 T are shown to increase by more than an order of magnitude the relaxation lifetime of hot carriers in periodically strained graphene.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-25304-0