[seminar] Seminar FO, Busse

[hbuljan at phy.hr]

Poštovani kolege,

Podsjećam na današnje predavanje

Srdačan pozdrav
Hrvoje Buljan

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SEMINAR FIZIČKOG ODSJEKA
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Vrijeme:   utorak, 22. 11. 2011., 14:15 sati (točno)
Mjesto:     Fizički odsjek, Bijenička c. 32, predavaonica F201

         Graphene on metal surfaces
               Dr. Carsten Busse
II. Physikalisches Institut, Universität zu Köln

The new material graphene (Noble Prize in Physics 2010) currently receives
an enormous attention for its exciting properties [1], caused by its
monoatomic thickness and the unique band structure arising from its
lattice symmetry.

We study the epitaxial growth of graphene on a metal surface (here:
Ir(111)), which leads to graphene of high structural quality which is only
weakly bonded to the substrate [1,2]. Complementing scanning tunneling
microscopy (STM), we determined key structural parameters using an x-ray
standing wave (XSW) analysis. The results are corroborated by extensive
density functional theory (DFT) calculations incorporating non-local
interactions [3]. The key finding is that graphene is weakly bound to
Ir(111) by global van der Waals forces with an added local covalent-like
contribution. This bonding pattern also explains the strong damping of
Plasmon in graphene on Ir(111) [4].

The electronic and geometric properties of graphene can be modified by
intercalating alkali metals, rare earths, or oxygen. Important for the
subsequent use of epitaxially grown graphene, the intercalation also makes
exfoliation of the carbon sheet possible.

[1] 	J. Coraux, A. T. N’Diaye, C. Busse, T. Michely, Nano Lett. 8,
565, (2008).
[2]	I. Pletikosić, M. Kralj, P. Pervan, R. Brako, J. Coraux, A. T.
N‘Diaye, C. Busse, T. Michely, Phys. Rev. Lett., 102, 056808 (2009).
[3]	C. Busse, P. Lazić, R. Djemour, J. Coraux, T. Gerber, N. Atodiresei,
V. Caciuc, R. Brako, A. T. N’Diaye, S. Blügel, J. Zegenhagen, T.
Michely, Phys. Rev. Lett. 107, 036101 (2011)
[4]	T. Langer, D. F. Förster, C. Busse, T. Michely, H. Pfnür, C.
Tegenkamp, New J. Phys, 13 053006 (2011)

				Voditelj seminara FO
				Hrvoje Buljan, hbuljan at phy.hr
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