{"id":104,"date":"2016-05-21T09:34:56","date_gmt":"2016-05-21T09:34:56","guid":{"rendered":"http:\/\/bifi.es\/~acastro\/?p=104"},"modified":"2016-05-21T09:40:23","modified_gmt":"2016-05-21T09:40:23","slug":"tailored-pump-probe-transient-spectroscopy-with-time-dependent-density-functional-theory-controlling-absorption-spectra","status":"publish","type":"post","link":"https:\/\/personal.unizar.es\/acastro\/?p=104","title":{"rendered":"Tailored pump-probe transient spectroscopy with time-dependent density-functional theory: controlling absorption spectra"},"content":{"rendered":"<p>Jessica Walkenhorst, Umberto De Giovannini, Alberto Castro, and Angel Rubio, <a href=\"http:\/\/dx.doi.org\/10.1140\/epjb\/e2016-70064-0\" target=\"_blank\">Eur. Phys. J. B 89, 128 (2016)<\/a><\/p>\n<p>Recent advances in laser technology allow us to follow electronic motion at its natural time-scale\u00a0with ultra-fast time resolution, leading the way towards attosecond physics experiments of extreme precision. In this work, we assess the use of tailored pumps in order to enhance (or reduce) some given features\u00a0of the probe absorption (for example, absorption in the visible range of otherwise transparent samples).\u00a0This type of manipulation of the system response could be helpful for its full characterization, since it\u00a0would allow us to visualize transitions that are dark when using unshaped pulses. In order to investigate\u00a0these possibilities, we perform first a theoretical analysis of the non-equilibrium response function in this\u00a0context, aided by one simple numerical model of the hydrogen atom. Then, we proceed to investigate the\u00a0feasibility of using time-dependent density-functional theory as a means to implement, theoretically, this\u00a0absorption-optimization idea, for more complex atoms or molecules. We conclude that the proposed idea\u00a0could in principle be brought to the laboratory: tailored pump pulses can excite systems into light-absorbing\u00a0states. However, we also highlight the severe numerical and theoretical difficulties posed by the problem:\u00a0large-scale non-equilibrium quantum dynamics are cumbersome, even with TDDFT, and the shortcomings\u00a0of state-of-the-art TDDFT functionals may still be serious for these out-of-equilibrium situations.<\/p>\n<p><a href=\"http:\/\/bifi.es\/~acastro\/wp-content\/uploads\/2016\/05\/fig7.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-108 size-medium\" src=\"http:\/\/bifi.es\/~acastro\/wp-content\/uploads\/2016\/05\/fig7-300x237.png\" alt=\"fig7\" width=\"300\" height=\"237\" srcset=\"https:\/\/personal.unizar.es\/acastro\/wp-content\/uploads\/2016\/05\/fig7-300x237.png 300w, https:\/\/personal.unizar.es\/acastro\/wp-content\/uploads\/2016\/05\/fig7.png 582w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jessica Walkenhorst, Umberto De Giovannini, Alberto Castro, and Angel Rubio, Eur. Phys. J. B 89, 128 (2016) Recent advances in laser technology allow us to follow electronic motion at its natural time-scale\u00a0with ultra-fast time resolution, leading the way towards attosecond physics experiments of extreme precision. In this work, we assess the use of tailored pumps [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-104","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/posts\/104"}],"collection":[{"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=104"}],"version-history":[{"count":5,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/posts\/104\/revisions"}],"predecessor-version":[{"id":107,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=\/wp\/v2\/posts\/104\/revisions\/107"}],"wp:attachment":[{"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/personal.unizar.es\/acastro\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}