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000189770 0247_ $$2doi$$a10.1103/PhysRevB.88.085419
000189770 0247_ $$2ISSN$$a0163-1829
000189770 0247_ $$2ISSN$$a0556-2805
000189770 0247_ $$2ISSN$$a1095-3795
000189770 0247_ $$2ISSN$$a1098-0121
000189770 0247_ $$2ISSN$$a1550-235X
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000189770 1001_ $$0P:(DE-HGF)0$$aForster, F.$$b0
000189770 245__ $$aDielectric screening of the Kohn anomaly of graphene on hexagonal boron nitride
000189770 260__ $$aCollege Park, Md.$$bAPS$$c2013
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000189770 520__ $$aKohn anomalies in three-dimensional metallic crystals are dips in the phonon dispersion that are caused by abrupt changes in the screening of the ion cores by the surrounding electron gas. These anomalies are also present at the high-symmetry points Γ and K in the phonon dispersion of two-dimensional graphene, where the phonon wave vector connects two points on the Fermi surface. The linear slope around the kinks in the highest optical branch is proportional to the electron-phonon coupling. Here, we present a combined theoretical and experimental study of the influence of the dielectric substrate on the vibrational properties of graphene. We show that screening by the dielectric substrate reduces the electron-phonon coupling at the high-symmetry point K and leads to an upshift of the Raman 2D line. This results in the observation of a Kohn anomaly that can be tuned by screening. The exact position of the 2D line can thus be taken also as a signature for changes in the (electron-phonon limited) conductivity of graphene.
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000189770 542__ $$2Crossref$$i2013-08-14$$uhttp://link.aps.org/licenses/aps-default-license
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000189770 7001_ $$0P:(DE-HGF)0$$aMolina-Sanchez, A.$$b1
000189770 7001_ $$0P:(DE-HGF)0$$aEngels, S.$$b2
000189770 7001_ $$0P:(DE-Juel1)145909$$aEpping, A.$$b3
000189770 7001_ $$0P:(DE-HGF)0$$aWatanabe, K.$$b4
000189770 7001_ $$0P:(DE-HGF)0$$aTaniguchi, T.$$b5
000189770 7001_ $$0P:(DE-HGF)0$$aWirtz, L.$$b6
000189770 7001_ $$0P:(DE-HGF)0$$aStampfer, C.$$b7$$eCorresponding Author
000189770 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.88.085419$$bAmerican Physical Society (APS)$$d2013-08-14$$n8$$p085419$$tPhysical Review B$$v88$$x1098-0121$$y2013
000189770 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.88.085419$$gVol. 88, no. 8, p. 085419$$n8$$p085419$$tPhysical review / B$$v88$$x1098-0121$$y2013
000189770 8564_ $$uhttp://journals.aps.org/prb/abstract/10.1103/PhysRevB.88.085419
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000189770 9132_ $$0G:(DE-HGF)POF3-521$$1G:(DE-HGF)POF3-520$$2G:(DE-HGF)POF3-500$$aDE-HGF$$bKey Technologies$$lFuture Information Technology - Fundamentals, Novel Concepts and Energy Efficiency (FIT)$$vControlling Electron Charge-Based Phenomena$$x0
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000189770 9141_ $$y2014
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