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X-ray free electron laser studies of electron and phonon dynamics of graphene adsorbed on copper
- Ogasawara, Hirohito (author)
- Wang, Han (author)
- Gladh, Jörgen (author)
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- Gallo, Alessandro (author)
- Page, Ralph (author)
- Voss, Johannes (author)
- Luntz, Alan (author)
- Diesen, Elias (author)
- Abild-Pedersen, Frank (author)
- Zajac, Marc (author)
- Attar, Andrew (author)
- Chen, Michelle E. (author)
- Cho, Sang Wan (author)
- Katoch, Abhishek (author)
- Kim, Ki-Jeong (author)
- Kim, Kyung Hwan (author)
- Kim, Minseok (author)
- Kwon, Soonnam (author)
- Park, Sang Han (author)
- Ribeiro, Henrique (author)
- Sainio, Sami (author)
- Yang, Cheolhee (author)
- Heinz, Tony (author)
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- (creator_code:org_t)
- 2023
- 2023
- English.
- In: Physical Review Materials. - 2475-9953. ; 7:2
- Journal article (peer-reviewed)
Abstract
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- We report optical pumping and x-ray absorption spectroscopy experiments at the Pohang Accelerator Laboratory free electron laser that probes the electron dynamics of a graphene monolayer adsorbed on copper in the femtosecond regime. By analyzing the results with ab initio theory we infer that the excitation of graphene is dominated by indirect excitation from hot electron-hole pairs created in the copper by the optical laser pulse. However, once the excitation is created in graphene, its decay follows a similar path as in many previous studies of graphene adsorbed on semiconductors, i.e., rapid excitation of strongly coupled optical phonons and eventual thermalization. It is likely that the lifetime of the hot electron-hole pairs in copper governs the lifetime of the electronic excitation of the graphene.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
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- Ogasawara, Hiroh ...
- Wang, Han
- Gladh, Jörgen
- Gallo, Alessandr ...
- Page, Ralph
- Voss, Johannes
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- Luntz, Alan
- Diesen, Elias
- Abild-Pedersen, ...
- Nilsson, Anders
- Soldemo, Markus
- Zajac, Marc
- Attar, Andrew
- Chen, Michelle E ...
- Cho, Sang Wan
- Katoch, Abhishek
- Kim, Ki-Jeong
- Kim, Kyung Hwan
- Kim, Minseok
- Kwon, Soonnam
- Park, Sang Han
- Ribeiro, Henriqu ...
- Sainio, Sami
- Wang, Hsin-Yi
- Yang, Cheolhee
- Heinz, Tony
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