Soft pair excitations and double-log divergences due to carrier interactions in graphene
Interactions between charge carriers in graphene lead to logarithmic renormalization of observables mimicking the behavior known in (3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft electron-hole (e-h) excitations generated as a result of fast charge dynamics, a direct analog of...
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| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/114805 https://orcid.org/0000-0002-6944-9805 https://orcid.org/0000-0002-4268-731X |
| _version_ | 1826201657663291392 |
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| author | Lewandowski, Cyprian Krzysztof Levitov, Leonid |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Lewandowski, Cyprian Krzysztof Levitov, Leonid |
| author_sort | Lewandowski, Cyprian Krzysztof |
| collection | MIT |
| description | Interactions between charge carriers in graphene lead to logarithmic renormalization of observables mimicking the behavior known in (3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft electron-hole (e-h) excitations generated as a result of fast charge dynamics, a direct analog of the signature QED effect—multiple soft photons produced by the QED vacuum shakeup. We show that such excitations are generated in photon absorption, when a photogenerated high-energy e-h pair cascades down in energy and gives rise to multiple soft e-h excitations. This fundamental process is manifested in a double-log divergence in the emission rate of soft pairs and a characteristic power-law divergence in their energy spectrum of the form 1/ω ln(ω/Δ). Strong carrier-carrier interactions make pair production a prominent pathway in the photoexcitation cascade. |
| first_indexed | 2024-09-23T11:54:44Z |
| format | Article |
| id | mit-1721.1/114805 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:54:44Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1148052022-09-27T22:47:46Z Soft pair excitations and double-log divergences due to carrier interactions in graphene Lewandowski, Cyprian Krzysztof Levitov, Leonid Massachusetts Institute of Technology. Department of Physics Lewandowski, Cyprian Krzysztof Levitov, Leonid Interactions between charge carriers in graphene lead to logarithmic renormalization of observables mimicking the behavior known in (3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft electron-hole (e-h) excitations generated as a result of fast charge dynamics, a direct analog of the signature QED effect—multiple soft photons produced by the QED vacuum shakeup. We show that such excitations are generated in photon absorption, when a photogenerated high-energy e-h pair cascades down in energy and gives rise to multiple soft e-h excitations. This fundamental process is manifested in a double-log divergence in the emission rate of soft pairs and a characteristic power-law divergence in their energy spectrum of the form 1/ω ln(ω/Δ). Strong carrier-carrier interactions make pair production a prominent pathway in the photoexcitation cascade. 2018-04-19T18:38:52Z 2018-04-19T18:38:52Z 2018-03 2017-12 2018-03-15T18:00:28Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/114805 Lewandowski, Cyprian and L. S. Levitov. "Soft pair excitations and double-log divergences due to carrier interactions in graphene." Physical Review B 97, 11 (March 2018): 115423 © 2018 American Physical Society https://orcid.org/0000-0002-6944-9805 https://orcid.org/0000-0002-4268-731X en http://dx.doi.org/10.1103/PhysRevB.97.115423 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Lewandowski, Cyprian Krzysztof Levitov, Leonid Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title | Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title_full | Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title_fullStr | Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title_full_unstemmed | Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title_short | Soft pair excitations and double-log divergences due to carrier interactions in graphene |
| title_sort | soft pair excitations and double log divergences due to carrier interactions in graphene |
| url | http://hdl.handle.net/1721.1/114805 https://orcid.org/0000-0002-6944-9805 https://orcid.org/0000-0002-4268-731X |
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