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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 13. predavanje iz sklopa "Kolokviji na IJS" v letu 2013/14, ki bo<span style='color:red'> <b>v petek, 28. marca 2014, ob 13. uri </b>v Veliki predavalnici Instituta »Jožef Stefan«<b> </b></span>na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b>Prof. dr. Benoît Deveaud-Plédran<o:p></o:p></b></p><p class=MsoNormal><i>Ecole Polytechnique Fédérale de Lausanne, Lozana, Švica<o:p></o:p></i></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'>Vrtinci in superfluidnost v ekscitonsko-polaritonskih kondenzatih <o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'><span lang=EN-US>Polaritoni so fascinantni kvazidelci, ki izhajajo iz sklopitve med fotoni in ekscitoni (pari elektronov in vrzeli v polprevodnikih). Polaritonski kondenzati lahko nastanejo spontano preko “standardnega” faznega prehoda proti Bose-Einsteinovem kondenzatu ali pa jih induciramo resonan</span>č<span lang=EN-US>no z jasno dolo</span>č<span lang=EN-US>eno fazo, hitrostjo in prostorsko porazdelitvijo. Zaradi fotonske komponente polaritonov je mogo</span>č<span lang=EN-US>e lastnosti kvantne teko</span>č<span lang=EN-US>ine </span>š<span lang=EN-US>tudirati zelo neposredno, </span>še <span lang=EN-US>posebej preko podrobnih interferometri</span>č<span lang=EN-US>nih meritev. Tako lahko npr. izjemno preprosto dolo</span>č<span lang=EN-US>imo koheren</span>č<span lang=EN-US>ne lastnosti kvantne teko</span>č<span lang=EN-US>ine na velikih razdaljah. Obenem je mo</span>č<span lang=EN-US> z veliko prostorsko in </span>č<span lang=EN-US>asovno natan</span>č<span lang=EN-US>nostjo izmeriti lastnosti superfluida. Tu bomo opisali statiko in dinamiko vrtincev v polaritonskih kondenzatih, dobljeno s pikosekundno </span>č<span lang=EN-US>asovno lo</span>č<span lang=EN-US>ljivostjo v razli</span>č<span lang=EN-US>nih konfiguracijah. Pokazali bomo dinamiko spontanega nastanka vrtinca in razpad vrtinca na dva polovi</span>č<span lang=EN-US>na. Poudarili bomo nekatere od nedavnih rezultatov, ki smo jih dobili s preoblikovanjem sistema bodisi z uporabo nanotehnologije bodisi s povsem opti</span>č<span lang=EN-US>nimi pristopi ali z obojim, kar omogo</span>č<span lang=EN-US>a raziskave superfluidne hidrodinamike polaritonskih teko</span>č<span lang=EN-US>in.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-family:"Calibri","sans-serif";color:red'>Lepo vabljeni!</span></b><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>*****<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>We invite you </span>to the 13th Institute <span style='color:black'>colloquium in the academic year 2013/14. The colloquium will be held </span><b><span style='color:red'>on Friday March 28, 2014 at 13 PM</span></b><span style='color:red'> in <b>the main Institute lecture hall</b></span><span style='color:black'>, Jamova 39, Ljubljana. To read the abstract click </span><a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a><span style='color:#1F497D'>. </span><span style='color:black'>Past colloquia are posted on</span><span style='color:#1F497D'> </span><a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a><span style='color:#1F497D'>.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><o:p></o:p></b></p><p class=MsoNormal><b>Prof. dr. Benoît Deveaud-Plédran<o:p></o:p></b></p><p class=MsoNormal><i>Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland<o:p></o:p></i></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:16.0pt'>Vortices and superfluidity in exciton-polariton condensates<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:16.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal>Polaritons are amazing quasiparticles originating from the coupling of photons with excitons (electron<span style='font-family:"Cambria Math","serif"'>‐</span>hole pairs in semiconductors). Polariton condensates may be created both spontaneously through a “standard” phase transition towards a Bose-Einstein condensate, or be resonantly driven with a well<span style='font-family:"Cambria Math","serif"'>‐</span>defined initial phase, speed and spatial distribution. Thanks to the photonic component of polaritons, the properties of the quantum fluid may be accessed very directly, with in particular the possibility of detailed interferometric studies. This allows for example to probe the long<span style='font-family:"Cambria Math","serif"'>‐</span>range coherence properties of a quantum fluid with unprecedented ease. This also allows testing superfluid properties with great precision in space and time. Here, I will describe the static and dynamics of vortices in polariton condensates, obtained with a picosecond time resolution, in different configurations, with in particular their phase configuration. I will show in particular the dynamics of spontaneous creation of a vortex as well as the dissociation of a full vortex into two half vortices. I will also highlight some of the recent results obtained through the shaping of the system, either using nanotechnology processes, or using all optical means, or both of them. This allows in particular the study superfluid hydrodynamics of polariton fluids.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span lang=EN-US style='font-size:14.0pt'>We look forward to meeting you at the “Kolokvij na IJS”!<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>