气候变化领域集成服务门户(CCPortal): Electron-phonon instability in graphene revealed by global and local noise probes

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DOI	10.1126/science.aaw2104
	Electron-phonon instability in graphene revealed by global and local noise probes
	Andersen T.I.; Dwyer B.L.; Sanchez-Yamagishi J.D.; Rodriguez-Nieva J.F.; Agarwal K.; Watanabe K.; Taniguchi T.; Demler E.A.; Kim P.; Park H.; Lukin M.D.
发表日期	2019
ISSN	0036-8075
起始页码	154
结束页码	157
卷号	364 期号:6436
英文摘要	Understanding and controlling nonequilibrium electronic phenomena is an outstanding challenge in science and engineering. By electrically driving ultraclean graphene devices out of equilibrium, we observe an instability that is manifested as substantially enhanced current fluctuations and suppressed conductivity at microwave frequencies. Spatial mapping of the nonequilibrium current fluctuations using nanoscale magnetic field sensors reveals that the fluctuations grow exponentially along the direction of carrier flow. Our observations, including the dependence on density and temperature, are consistently explained by the emergence of an electron-phonon Cerenkov instability at supersonic drift velocities. These results offer the opportunity for tunable terahertz generation and active phononic devices based on two-dimensional materials. © 2017 The Authors.
英文关键词	graphene; electrical conductivity; electron; equipment; magnetic field; mapping method; sensor; temperature effect; two-dimensional modeling; Article; conductance; confocal microscopy; controlled study; electric field; hydrodynamics; magnetic field; nanoanalysis; phonon; priority journal; spectroscopy
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/242831
作者单位	Department of Physics, Harvard University, Cambridge, MA 02138, United States; Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, United States; Department of Physics, McGill University, Montréal, QC H3A 2T8, Canada; National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki, 305-0044, Japan; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States; Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, United States
推荐引用方式 GB/T 7714	Andersen T.I.,Dwyer B.L.,Sanchez-Yamagishi J.D.,et al. Electron-phonon instability in graphene revealed by global and local noise probes[J],2019,364(6436).
APA	Andersen T.I..,Dwyer B.L..,Sanchez-Yamagishi J.D..,Rodriguez-Nieva J.F..,Agarwal K..,...&Lukin M.D..(2019).Electron-phonon instability in graphene revealed by global and local noise probes.Science,364(6436).
MLA	Andersen T.I.,et al."Electron-phonon instability in graphene revealed by global and local noise probes".Science 364.6436(2019).