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<DIV><FONT face=Arial size=2>Les recordamos el Coloquio de hoy</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><FONT face="Times New Roman"
size=3>
COLOQUIOS DEL DEPARTAMENTO DE
FÍSICA<BR>
FCEyN -
UBA<BR><BR>
Charla, café
y galletitas<BR> En
el Aula Federman, 1er piso Pabellón
I.<BR>
Ciudad Universitaria</FONT> </DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2><FONT face="Times New Roman"
size=3>
<STRONG>Hoy</STRONG> jueves 30 de octubre a las 14 hs<FONT face=Arial
size=2> </FONT></FONT></FONT></DIV>
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<DIV>
<P class=MsoBodyText style="MARGIN: 0cm 0cm 0pt"><SPAN lang=IT><FONT face=Arial
size=5><FONT face="Times New Roman">Inestabilidades de Pomeranchuk en
</FONT></FONT></SPAN><SPAN lang=IT><FONT face=Arial size=5><FONT
face="Times New Roman">sistemas correlacionados en la
red<BR></P></FONT></FONT></SPAN><SPAN lang=IT><FONT face=Arial
size=5></FONT></SPAN>
<P class=MsoBodyText style="MARGIN: 0cm 0cm 0pt"><SPAN lang=IT><FONT face=Arial
size=2></FONT></SPAN> </P></FONT></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN>
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style="FONT-SIZE: 22pt; COLOR: black; FONT-FAMILY: Verdana; mso-bidi-font-size: 12.0pt; mso-ansi-language: ES; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'"><FONT
size=5><SPAN><FONT face="Times New Roman"><STRONG><FONT
size=6></FONT></STRONG></DIV>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=ES-AR><FONT
size=3><SPAN
style="mso-spacerun: yes"> <FONT
size=5> Daniel
Cabra</FONT></SPAN></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=ES-AR><FONT
size=5><SPAN style="mso-spacerun: yes"></SPAN></FONT></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=ES-AR><FONT
size=3><SPAN style="mso-spacerun: yes"></SPAN></FONT></SPAN><SPAN
lang=ES-AR><FONT size=4><SPAN style="mso-spacerun: yes"><SPAN lang=EN-GB
style="FONT-SIZE: 12pt; mso-ansi-language: EN-GB; mso-fareast-font-family: 'MS Mincho'"> <FONT
size=4>Departamento de Física, Universidad Nacional de La
Plata</FONT></SPAN></SPAN></FONT></SPAN></FONT></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></SPAN><FONT
face=Arial size=2><FONT face=Arial size=2><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: Verdana; mso-bidi-font-size: 10.0pt; mso-ansi-language: EN-GB; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA; mso-bidi-font-family: Arial"><FONT
face="Times New Roman"
size=3> </FONT></SPAN><FONT
face=Arial size=2><SPAN lang=ES-AR style="mso-ansi-language: ES-AR"><FONT
face="Times New Roman"
size=3>
</FONT></SPAN></P>
<DIV>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=ES-AR
style="mso-ansi-language: ES-AR"></SPAN>-----------------------------------------------------------------------------------------------------------------------------------------------</P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><BR> </P></DIV>
<DIV><FONT face="Times New Roman" size=3>RESUMEN:</FONT></DIV>
<DIV><SPAN style="mso-ansi-language: ES"><?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><O:P><FONT face="Times New Roman"
size=3> </FONT></O:P></SPAN></DIV>
<DIV align=justify><SPAN style="mso-ansi-language: ES"><O:P></O:P></SPAN><SPAN
style="mso-ansi-language: ES"><O:P><SPAN
style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt"><SPAN
style="FONT-SIZE: 16pt; COLOR: black; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: ES; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA"><SPAN
style="FONT-SIZE: 18pt; mso-bidi-font-size: 12.0pt"><FONT
face="Times New Roman"><SPAN class=MquinadeescribirHTML2><SPAN lang=ES-AR
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT face="Times New Roman"><FONT
face="Century Gothic" color=black><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Century Gothic'"><FONT
face="Times New Roman"><SPAN
style="FONT-SIZE: 16pt; COLOR: black; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: ES; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA"><FONT
size=3><SPAN
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size=3><SPAN lang=ES-AR style="mso-ansi-language: ES-AR"><SPAN lang=ES-AR
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: ES-AR; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: EN-US; mso-bidi-language: AR-SA"><SPAN
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style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt"><FONT size=3><SPAN
lang=ES-AR
style="FONT-SIZE: 16pt; COLOR: black; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: ES-AR; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA"><SPAN
lang=ES-AR
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt; mso-ansi-language: ES-AR; mso-bidi-font-family: 'Times New Roman'"><FONT
face="Times New Roman"><SPAN
style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt"><SPAN
style="FONT-SIZE: 16pt; mso-bidi-font-size: 12.0pt"><FONT size=3><SPAN
style="FONT-SIZE: 20pt; mso-bidi-font-size: 12.0pt"><SPAN lang=ES-AR><SPAN
style="mso-ansi-language: ES"><SPAN lang=ES-AR
style="FONT-SIZE: 15pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: ES-AR; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA; mso-bidi-font-family: Times-Roman"><FONT
face=Arial size=3>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=FR
style="FONT-SIZE: 12pt; mso-ansi-language: FR; mso-fareast-font-family: 'MS Mincho'"><SPAN
lang=EN-US
style="FONT-SIZE: 16pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-ansi-language: EN-US; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA"><FONT
size=3>El estudio de inestabilidades de Pomeranchuk ha sido<BR>objeto de
numerosos trabajos recientes, por su posible relevancia en <BR>sistemas con
efecto Hall y en los metamagnetos Sr3Ru2O7 y URu2Si2.<BR>Motivados por
estos estudios, desarrollamos un metodo que permite detectar <BR>inestabilidades
en un liquido de Fermi en el caso de sistemas de <BR>electrones en una red. Se
trata de una generalizacion del analisis <BR>original de Pomeranchuk, que
corresponde al caso en que la superficie de <BR>Fermi tiene simetria esferica.
El metodo que presentamos es completamente <BR>general, ya que no se basa en las
simetrias de la superficie de Fermi. <BR>Como ejemplos, presentamos un modelo de
electrones en una red cuadrada con <BR>interacciones que dan lugar a
inestabilidades de onda s y p.<BR>Presentamos tambien resultados preliminares en
el analisis de <BR>inestabilidades en grafeno con interacciones de Hubbard
extendidas.<BR></FONT></SPAN></SPAN></P></FONT></SPAN></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></FONT></SPAN></SPAN></FONT></SPAN></FONT></SPAN></SPAN></SPAN></FONT></SPAN></FONT></SPAN></FONT></SPAN></FONT></FONT></SPAN></SPAN></FONT></SPAN></SPAN></SPAN></O:P></SPAN></DIV></FONT></FONT></FONT></FONT></FONT></BODY></HTML>