<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2002000100011</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Thermalization process of a photo-generated plasma in semiconductors]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Meza]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Instituto de Física ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares  ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>1</numero>
<fpage>52</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The kinetics of ultra-fast processes which leads to the thermalization condition of a photo-excited plasma in semiconductor systems is studied theoretically. We analyze the time evolution of a carrier population generated by a finite optical pulse, from the beginning of the pulse until the time in which the carrier population reaches a quasi-equilibrium condition. We calculate the energy fluxes caused by the main interaction mechanisms along the different stages the system passes through. Our analysis is done by using a set of non-linear rate equations which govern the time evolution of the carrier population in the energy space. We consider the main interaction mechanisms, including dynamic screening and phonon population effects.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se estudia la cinética de los procesos ultrarrápidos que llevan a la condición de termalización de un plasma fotoexcitado en sistemas semiconductores. Analizamos la evolución temporal de una población generada por un pulso óptico finito, desde el comienzo del pulso hasta el tiempo en el que la población alcanza una condición de cuasi equilibrio. Calculamos los flujos de energía causados por los mecanismos principales de interacción a lo largo de las diferentes etapas por las que pasa el sistema. Hacemos nuestro análisis usando un conjunto no lineal de ecuaciones de razón de cambio que gobiernan la evolución temporal de la población de portadores en el espacio de energías. Consideramos los mecanismos principales de interacción, incluyendo el apantallamiento dinámico y los efectos de población de fonones.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Photo-excited plasma]]></kwd>
<kwd lng="en"><![CDATA[thermalization]]></kwd>
<kwd lng="en"><![CDATA[ultrafast processes in semiconductors]]></kwd>
<kwd lng="es"><![CDATA[Plasma fotoexcitado]]></kwd>
<kwd lng="es"><![CDATA[termalización]]></kwd>
<kwd lng="es"><![CDATA[procesos ultrarrápidos en semiconductores]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Thermalization process of a photo&#45;generated plasma in semiconductors</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>M.A. Rodr&iacute;guez&#45;Meza<sup>1,2*</sup> and J.L. Carrillo<sup>1</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Instituto de F&iacute;sica, Universidad Aut&oacute;noma de Puebla. Apartado postal J&#45;48, 72570 Puebla, Pue., M&eacute;xico</i>. e&#45;mail: * <a href="mailto:mar@sirio.ifuap.buap.mx">mar@sirio.ifuap.buap.mx</a><a href="mailto:mar@sirio.ifuap.buap.mx"></a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto Nacional de Investigaciones Nucleares. Apartado postal 18&#45;1027, 11801 M&eacute;xico, D.F., M&eacute;xico</i>.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 20 de junio de 2001.    <br> 	Aceptado el 30 de noviembre de 2001.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The kinetics of ultra&#45;fast processes which leads to the thermalization condition of a photo&#45;excited plasma in semiconductor systems is studied theoretically. We analyze the time evolution of a carrier population generated by a finite optical pulse, from the beginning of the pulse until the time in which the carrier population reaches a quasi&#45;equilibrium condition. We calculate the energy fluxes caused by the main interaction mechanisms along the different stages the system passes through. Our analysis is done by using a set of non&#45;linear rate equations which govern the time evolution of the carrier population in the energy space. We consider the main interaction mechanisms, including dynamic screening and phonon population effects.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Photo&#45;excited plasma; thermalization; ultrafast processes in semiconductors.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se estudia la cin&eacute;tica de los procesos ultrarr&aacute;pidos que llevan a la condici&oacute;n de termalizaci&oacute;n de un plasma fotoexcitado en sistemas semiconductores. Analizamos la evoluci&oacute;n temporal de una poblaci&oacute;n generada por un pulso &oacute;ptico finito, desde el comienzo del pulso hasta el tiempo en el que la poblaci&oacute;n alcanza una condici&oacute;n de cuasi equilibrio. Calculamos los flujos de energ&iacute;a causados por los mecanismos principales de interacci&oacute;n a lo largo de las diferentes etapas por las que pasa el sistema. Hacemos nuestro an&aacute;lisis usando un conjunto no lineal de ecuaciones de raz&oacute;n de cambio que gobiernan la evoluci&oacute;n temporal de la poblaci&oacute;n de portadores en el espacio de energ&iacute;as. Consideramos los mecanismos principales de interacci&oacute;n, incluyendo el apantallamiento din&aacute;mico y los efectos de poblaci&oacute;n de fonones.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Plasma fotoexcitado; termalizaci&oacute;n; procesos ultrarr&aacute;pidos en semiconductores.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 72.20.Jv; 72.20.Dp; 78.20.Bh; 78.47.+p</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n1/v48n1a11.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. J. Shah and R.C.C. Leite, <i>Phys. Rev. Lett</i> <b>22</b> (1969) 1304;    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8415815&pid=S0035-001X200200010001100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> J. Shah, <i>Phys. Rev. B</i> <b>10</b> (1974) 3697;    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8415816&pid=S0035-001X200200010001100002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --> J. Shah, <i>Solid State Electron.</i> <b>21</b> (1978) 43.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8415817&pid=S0035-001X200200010001100003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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