<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div><p style="margin: 0px;" data-mce-style="margin: 0px;"><strong><span lang="EN-GB" style="font-family: 'Arial','sans-serif';" data-mce-style="font-family: 'Arial','sans-serif';">Poštovani,</span></strong><span lang="EN-GB" style="font-family: 'Arial','sans-serif';" data-mce-style="font-family: 'Arial','sans-serif';"><br> <strong>podsjećamo Vas na <span style="color: red;" data-mce-style="color: red;">današnji</span> seminar na</strong></span><span lang="EN-GB" style="font-size: 10.0pt; font-family: 'Arial','sans-serif';" data-mce-style="font-size: 10.0pt; font-family: 'Arial','sans-serif';"> </span><strong><span lang="EN-GB" style="font-family: 'Arial','sans-serif';" data-mce-style="font-family: 'Arial','sans-serif';">Institutu za fiziku u <span style="color: red;" data-mce-style="color: red;">15:00 </span>sati:</span></strong></p><p style="margin: 0px;" data-mce-style="margin: 0px;"><strong> </strong></p><p style="margin: 0px;" data-mce-style="margin: 0px;"><strong><img src="cid:0c2d621037a84a173f7cd29016dbf8294f8e8338@zimbra" data-mce-src="cid:0c2d621037a84a173f7cd29016dbf8294f8e8338@zimbra" style="display: block; margin-left: auto; margin-right: auto;" data-mce-style="display: block; margin-left: auto; margin-right: auto;"><br></strong></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-family: 'Century Gothic','sans-serif'; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic','sans-serif'; color: #5f5f5f;">Institut za fiziku, Bijenička cesta 46,</span></b></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-family: 'Century Gothic','sans-serif'; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic','sans-serif'; color: #5f5f5f;">predavaonica u zgradi Mladen Paić</span></b></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><strong><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic','sans-serif'; color: #993300;" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic','sans-serif'; color: #993300;">četvrtak, 22. svibnja 2014., u 15:00 sati</span></b><br></strong></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><strong><br></strong></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><strong><b><span lang="EN-GB" style="font-size: 14.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 14.0pt; font-family: 'Century Gothic','sans-serif';">Christoph Gadermaier</span></b></strong></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><br></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><br></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">Department of Complex Matter and International Postgraduate School</span></b></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">Jozef Stefan Institute</span></b></p><p align="center" style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">Jamova 39, 1000 Ljubljana, Slovenia</span></b><b><span lang="EN-US" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';"></span></b></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><b><i><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">E-mail: <span style="color: blue;" data-mce-style="color: blue;">christoph.gadermaier@ijs.si<span class="object"><span style="text-decoration: underline;" data-mce-style="text-decoration: underline;"></span></span></span></span></i></b><br></p><p style="margin: 0px; text-align: center;" data-mce-style="margin: 0px; text-align: center;"><br></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';">Recent progress in the exfoliation of layered materials and the nanofabrication of functional structures has revived the interest in two-dimensional materials with properties complementary to graphene, in particular transition metal dichalcogenides (TMDs) such as MoS2. Depending on the coordination and oxidation state of the metal atoms, TMDs can be metallic, semimetallic, or semiconducting. In addition, superconductivity and charge-density wave effects have been observed in some TMDs. A transistor and a logical circuit device based on a monolayer of MoS2 have recently been demonstrated.</span></b></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';">The functional properties of any material are determined by its response to external stimuli, which drive it out of equilibrium. Hence, fundamental understanding is gained from studying relaxation processes. A salient question in semiconducting TMDs is the electronic nature of photoexcited states, which determines their optoelectronic and energy harvesting functionalities. On the one hand, there are imperative indications for excitons as the primary photoexcitations, with a binding energy that strongly increases with decreasing number of layers, reaching 0.5 – 1 eV for the monolayer. On the other hand, efficient photovoltaics and highly sensitive photodetectors based on monolayer MoS2 transistors have been demonstrated, which both require mobile carriers created by the absorption of light.</span></b></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';">Here we use femtosecond optical spectroscopy to show that a significant fraction of the photoexcited excitons in MoS2 dissociates within a few ps. We discuss the implications of the excitation wavelength and layer number dependence for the possible dissociation mechanism and present preliminary results on the electron dynamics in heterostructures with an increased charge separation efficiency.</span></b><br></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';"><br></span></b></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';"></span></b></p><p style="margin: 0px;" data-mce-style="margin: 0px;"><b><span lang="EN-GB" style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">Voditelji seminara IF-a: Nikša Krstulović i Osor Bari</span></b><b><span style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 11.0pt; font-family: 'Century Gothic','sans-serif';">šić</span></b><b><span style="font-size: 10.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 10.0pt; font-family: 'Century Gothic','sans-serif';"></span></b></p><p style="margin: 0px; text-align: left;" data-mce-style="margin: 0px; text-align: left;"><b><span lang="EN-GB" style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';" data-mce-style="font-size: 12.0pt; font-family: 'Century Gothic','sans-serif';"><br></span></b></p></div><div style="text-align: left;"><span style="font-size: 12pt;" data-mce-style="font-size: 12pt;"> </span></div><div><span style="font-size: 12pt;" data-mce-style="font-size: 12pt;">*************************</span></div><div>Nikša Krstulović, PhD<br>Research associate<br><div><br></div>Institute of Physics<br>Bijenicka 46<br>HR-10000 Zagreb, Croatia<br><div><br></div>Phone: 00385 1 4698 872<br> 00385 1 4698 851<br>Fax: 00385 1 4698 889<br><div><br></div>http://www.ifs.hr/<br>http://spectra.ifs.hr/<br>**************************<br><div><br></div><span name="x"></span></div></div></body></html>