气候变化领域集成服务门户(CCPortal): Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe

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DOI	10.1073/pnas.2008282117
	Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe
	Chen Z.; Sjakste J.; Dong J.; Taleb-Ibrahimi A.; Rueff J.-P.; Shukla A.; Peretti J.; Papalazarou E.; Marsi M.; Perfetti L.
发表日期	2020
ISSN	0027-8424
起始页码	21962
结束页码	21967
卷号	117 期号:36
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.
英文关键词	Hot carriers optoelectronic; Time-resolved spectroscopy; Two-dimensional systems
语种	英语
scopus关键词	Article; calculation; concentration (parameter); dynamics; electron; gas; mathematical computing; priority journal; spectroscopy; structure analysis
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160227
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 Pa...
推荐引用方式 GB/T 7714	Chen Z.,Sjakste J.,Dong J.,et al. Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe[J],2020,117(36).
APA	Chen Z..,Sjakste J..,Dong J..,Taleb-Ibrahimi A..,Rueff J.-P..,...&Perfetti L..(2020).Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe.Proceedings of the National Academy of Sciences of the United States of America,117(36).
MLA	Chen Z.,et al."Ultrafast dynamics of hot carriers in a quasi-two-dimensional electron gas on InSe".Proceedings of the National Academy of Sciences of the United States of America 117.36(2020).