globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2008282117
论文题名:
Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe
作者: Chen Z.; Sjakste J.; Dong J.; Taleb-Ibrahimi A.; Rueff J.-P.; Shukla A.; Peretti J.; Papalazarou E.; Marsi M.; Perfetti L.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:36
起始页码: 21962
结束页码: 21967
语种: 英语
英文关键词: Hot carriers optoelectronic ; Time-resolved spectroscopy ; Two-dimensional systems
Scopus关键词: Article ; calculation ; concentration (parameter) ; dynamics ; electron ; gas ; mathematical computing ; priority journal ; spectroscopy ; structure analysis
英文摘要: Two-dimensional electron gases (2DEGs) are at the base of current nanoelectronics because of their exceptional mobilities. Often the accumulation layer forms at polar interfaces with longitudinal optical (LO) modes. In most cases, the many-body screening of the quasi-2DEGs dramatically reduces the Fröhlich scattering strength. Despite the effectiveness of such a process, it has been recurrently proposed that a remote coupling with LO phonons persists even at high carrier concentration. We address this issue by perturbing electrons in an accumulation layer via an ultrafast laser pulse and monitoring their relaxation via time- and momentum-resolved spectroscopy. The cooling rate of excited carriers is monitored at doping level spanning from the semiconducting to the metallic limit. We observe that screening of LO phonons is not as efficient as it would be in a strictly 2D system. The large discrepancy is due to the remote coupling of confined states with the bulk. Our data indicate that the effect of such a remote coupling can be mimicked by a 3D Fröhlich interaction with Thomas- Fermi screening. These conclusions are very general and should apply to field effect transistors (FET) with high-k dielectric gates, van der Waals heterostructures, and metallic interfaces between insulating oxides. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163399
Appears in Collections:气候变化与战略

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作者单位: Chen, Z., Laboratoire des Solides Irradies, CEA/DRF/lRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, Palaiseau, F-91128, France; Sjakste, J., Laboratoire des Solides Irradies, CEA/DRF/lRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, Palaiseau, F-91128, France; Dong, J., Laboratoire des Solides Irradies, CEA/DRF/lRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, Palaiseau, F-91128, France; Taleb-Ibrahimi, A., Societe Civile Synchrotron SOLEIL, GIF-sur-Yvette, 91192, France; Rueff, J.-P., Societe Civile Synchrotron SOLEIL, GIF-sur-Yvette, 91192, France; Shukla, A., Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie, Faculte des Sciences et Ingenierie, Sorbonne Universite, CNRS-UMR7590, Paris, 75252, France; Peretti, J., Laboratoire de Physique de la Matiere Condensee, Ecole Polytechnique, CNRS, CEA, Institut Polytechnique de Paris, Palaiseau cedex, 91128, France; Papalazarou, E., Laboratoire de Physique des Solides, CNRS, Universite Paris-Saclay, Orsay, 91405, France; Marsi, M., Laboratoire de Physique des Solides, CNRS, Universite Paris-Saclay, Orsay, 91405, France; Perfetti, L., Laboratoire des Solides Irradies, CEA/DRF/lRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, Palaiseau, F-91128, France

Recommended Citation:
Chen Z.,Sjakste J.,Dong J.,et al. Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(36)
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