<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Dear Soft Matter Colleagues and Friends,</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">On Friday 18 December 2020 at 9:30 AM we are hosting a seminar during which</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class=""><b class="">Michał Tomza </b>(IFT UW)</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">will give a talk</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><b class="">Ultracold ion-atom collisions in the quantum regime</b></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><b class="">Abstract</b></div><div class="" style="font-family: HelveticaNeue; text-align: justify; margin: 0px; font-stretch: normal; line-height: normal;"><span style="text-align: start;" class="">Hybrid systems of laser-cooled trapped ions and ultracold atoms</span><br style="text-align: start;" class=""><span style="text-align: start;" class="">combined in a single experimental setup have recently emerged as a new </span><span style="text-align: start;" class="">platform for fundamental research in quantum physics [1]. Reaching the </span><span style="text-align: start;" class="">ultracold s-wave quantum regime has been one of the most important </span><span style="text-align: start;" class="">challenges in this field for a long time. Unfortunately, the lowest </span><span style="text-align: start;" class="">attainable temperatures in experiments using the Paul ion trap are </span><span style="text-align: start;" class="">limited by the possible rf-field-induced heating related to the </span><span style="text-align: start;" class="">micromotion [2]. Recently, buffer gas cooling of a single ion in a </span><span style="text-align: start;" class="">Paul trap to the quantum regime of ion-atom collisions was realized </span><span style="text-align: start;" class="">and a deviation from classical Langevin theory was observed by </span><span style="text-align: start;" class="">studying the spin-exchange dynamics, indicating quantum effects in the </span><span style="text-align: start;" class="">ion-atom collisions [3]. In my seminar, I will present how in </span><span style="text-align: start;" class="">collaboration with experimental groups from Amsterdam [3] and </span><span style="text-align: start;" class="">Stuttgart [4] we have overcome this limitation and how electronic </span><span style="text-align: start;" class="">structure theory and nuclear dynamics simulations guided and explained </span><span style="text-align: start;" class="">experimental efforts.</span><br style="text-align: start;" class=""><br style="text-align: start;" class=""><span style="text-align: start;" class="">[1] Tomza et al, Rev. Mod. Phys. 91, 035001 (2019)</span><br style="text-align: start;" class=""><span style="text-align: start;" class="">[2] Cetina et al., Phys. Rev. Lett. 109, 253201 (2012)</span><br style="text-align: start;" class=""><span style="text-align: start;" class="">[3] Feldker et al, Nat. Phys. Nature Phys. 16, 413 (2020)</span><br style="text-align: start;" class=""><span style="text-align: start;" class="">[4] Schmid et al, Phys. Rev. Lett. 120, 153401 (2018)</span></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">The seminar will be conducted on Zoom</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><span class="" style="text-decoration: underline;"><a href="https://zoom.us/j/92987083349?pwd=YTZLSFVWUnJzdE4xS1drR3dqMVFDdz09" class=""><font face="HelveticaNeue" class="">https://zoom.us/j/92987083349?pwd=YTZLSFVWUnJzdE4xS1drR3dqMVFDdz09</font></a></span></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">and will begin at <b class="">9:30AM</b>. </font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue" class=""><br class=""></font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Maria Ekiel-Jeżewska</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Maciej Lisicki</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Marek Napiórkowski</font></div><div class="" style="font-family: HelveticaNeue; margin: 0px; font-stretch: normal; line-height: normal;"><font face="HelveticaNeue" class="">Piotr Szymczak</font></div><div class=""><br class=""></div>
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