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<P class=MsoNormal style="MARGIN: 3pt 0cm; TEXT-ALIGN: center"
align=center><B style="mso-bidi-font-weight: normal"><SPAN
style="COLOR: #5f5f5f; FONT-FAMILY: 'Century Gothic'">Institut za fiziku,
Bijenička cesta 46,<o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 3pt 0cm; TEXT-ALIGN: center"
align=center><B style="mso-bidi-font-weight: normal"><SPAN
style="COLOR: #5f5f5f; FONT-FAMILY: 'Century Gothic'">predavaonica u
zgradi Mladen Paić<o:p></o:p></SPAN></B></P>
<P style="MARGIN: 3.1pt 0cm; TEXT-ALIGN: center" align=center><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 14pt; COLOR: #993300; FONT-FAMILY: 'Century Gothic'">četvrtak,
30. lipnja 2011., u 15:00 sati</SPAN></B><SPAN
style="FONT-FAMILY: 'Century Gothic'"><o:p></o:p></SPAN></P></TD></TR>
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<TD
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<P style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%; TEXT-ALIGN: center"
align=center><FONT face="Arial Unicode MS"><B><SPAN
style="FONT-SIZE: 16pt; COLOR: #55913c; mso-bidi-font-size: 12.0pt">Unoccupied
electronic states in graphene systems</SPAN></B><B><SPAN
style="FONT-SIZE: 16pt; COLOR: #559132; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt"><o:p></o:p></SPAN></B></FONT></P></TD></TR>
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<TD
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<P style="MARGIN: 5.95pt 0cm 0pt; TEXT-ALIGN: center"
align=center><B><SPAN
style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 13.5pt">Dr.
</SPAN></B><B><SPAN
style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">Vyacheslav
M. Silkin</SPAN></B><B><SPAN
style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 13.5pt">
</SPAN></B><B><SPAN
style="FONT-SIZE: 14pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt"><o:p></o:p></SPAN></B></P></TD></TR>
<TR>
<TD
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<P style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><SPAN
lang=EN-US
style="FONT-FAMILY: 'Century Gothic'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US"> <o:p></o:p></SPAN></B></P>
<P style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">Donostia
International Physics Center (D.I.P.C.), <o:p></o:p></SPAN></B></P>
<P style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">Departamento
de Física de Materiales, Universidad del País Vasco, San Sebastian, Spain
<o:p></o:p></SPAN></B></P>
<P style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center" align=center><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">IKERBASQUE,
Basque Foundation for Science, Bilbao, Spain</SPAN></B><B><SPAN lang=EN-US
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US"><o:p></o:p></SPAN></B></P>
<P style="MARGIN: 5.95pt 0cm 0pt; TEXT-ALIGN: center"
align=center><B><I><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">E-mail:
<SPAN style="COLOR: blue"><A href="mailto:waxslavs@ehu.es"><SPAN
style="mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'">waxslavs@ehu.es</SPAN></A><SPAN
class=object><U> </U></SPAN></SPAN></SPAN></I></B><SPAN
style="FONT-FAMILY: 'Century Gothic'"><o:p></o:p></SPAN></P></TD></TR>
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<TD
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<P class=MsoBodyText
style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><B><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic'">Recently it has
been shown that polarization of a two-dimensional graphene sheet by an
external charge produces an attractive image potential that supports, in
addition to the well-known </SPAN></B><B><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Symbol; mso-ascii-font-family: 'Century Gothic'; mso-hansi-font-family: 'Century Gothic'; mso-char-type: symbol; mso-symbol-font-family: Symbol"><SPAN
style="mso-char-type: symbol; mso-symbol-font-family: Symbol">p</SPAN></SPAN></B><B><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic'">* bands, a double
series of Rydberg-like image potential states converging towards the
vacuum level. Being quantified in the perpendicular to the graphene sheet
direction, in the parallel plane these states have nearly free electron
character like similar states on metal surfaces. A large extension of wave
function of image-potential states into the vacuum implies that they are
very sensitive to any change of shape and environment of the graphene
sheet. Thus the properties of these states can be modified by an external
electric field and a shape/geometry variation. The lowest-energy members
of such states have been experimentally observed in graphene sheets grown
on some substrates. Some examples of such unoccupied electronic states in
other carbon-based materials, like graphite, multilayer graphene,
fullerenes, and nanotubes, as having common origin with the graphene
image-potential states will be presented.<o:p></o:p></SPAN></B></P>
<P class=MsoBodyText
style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 6pt; TEXT-ALIGN: justify; mso-line-height-rule: exactly"><B><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century Gothic'"> <o:p></o:p></SPAN></B></P>
<P style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 150%"><B><I><SPAN
style="COLOR: blue; FONT-FAMILY: 'Century Gothic'"><A
href="http://dipc.ehu.es/group/index.htm"><SPAN
style="mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'">http://dipc.ehu.es/group/index.htm</SPAN></A><o:p></o:p></SPAN></I></B></P></TD></TR>
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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt"> <o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt"> <o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt">Voditelji
seminara IF-a: Vlasta Horvatić i Ivica Živković</SPAN></B><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Century Gothic'; mso-bidi-font-size: 12.0pt"><o:p></o:p></SPAN></B></P>
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style="mso-spacerun: yes"></SPAN></SPAN></B> </P>
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