{"id":896,"date":"2023-07-10T14:02:57","date_gmt":"2023-07-10T05:02:57","guid":{"rendered":"https:\/\/www.elst.okayama-u.ac.jp\/en\/?page_id=896"},"modified":"2026-02-16T11:06:03","modified_gmt":"2026-02-16T02:06:03","slug":"areas07_phys","status":"publish","type":"page","link":"https:\/\/www.elst.okayama-u.ac.jp\/en\/education\/mc-suuri\/areas07_phys\/","title":{"rendered":"Physics of Solid Surfaces and Interfaces"},"content":{"rendered":"<h4>&nbsp;<\/h4>\n<div class=\"el_figureFlex el_figureFlex__halfTitle\">\n<div>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/theme_YOKOYA.png\" width=\"320\" height=\"408\"><\/h3>\n<p>The properties (functionality) of a solid are determined by the states of electrons (energy, momentum and spin). Clarifying the electronic states experimentally leads to elucidating the origin and\/or mechanism of the functionality and gives the strategy to improve the functionality. We are conducting research to investigate electronic states in materials in detail using advanced electron spectroscopy techniques.<\/p>\n<\/div>\n<div>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/theme_MURAOKA.png\" width=\"320\" height=\"408\"><\/h3>\n<p>We focus on the research for the preparation of nanostructured thin films and development of new functional thin films. Self-organized nanostructured films are what we are interested in. As for functional thin films, our target is materials that exhibit superconductivity and metal-insulator transition. We also conduct research to evaluate the quality of the thin films and elucidate the mechanism of function in the films through experiments on the electronic states.<\/p>\n<\/div>\n<\/div>\n<ul>\n<li><a href=\"https:\/\/sites.google.com\/view\/yokoya-group\">Link to group homepage<\/a><\/li>\n<\/ul>\n<table class=\"el_table_fix\" style=\"width: 100%\">\n<tbody>\n<tr>\n<th style=\"width: 20%\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/YOKOYATakayoshi.jpg\" width=\"320\" height=\"408\"><\/th>\n<td style=\"width: 80%\">\n<ul>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">Prof. YOKOYA Takayoshi<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">E-mail: yokoya<span style=\"color: #0000ff\"> [at]<\/span> okayama-u.ac.jp<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">Electronic states\/ photoemission spectroscopy\/ Elucidation of the mechanism of functionality\n<p><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt\"><a class=\"el_linkBtn\" href=\"https:\/\/soran.cc.okayama-u.ac.jp\/html\/2717034a7e21d10a74506e4da22f6611_en.html\">Directory of Researchers<\/a>&nbsp;<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/img_YOKOYA.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/img_YOKOYA.png\" alt=\"\" width=\"266\" height=\"203\"><\/a><\/p>\n<p>Half-metal is a material that can generate electric currents with aligned electron spins, and is one of the important materials in spintronics. We studied electronic states of half-metals using spin-resolved photoemission spectroscopy, and found that electron-electron interactions differ greatly for each spin state. This result indicates the need to consider spin-dependent electron correlation effects in device design in spintronics.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<table class=\"el_table_fix\" style=\"width: 100%\">\n<tbody>\n<tr>\n<th style=\"width: 20%\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/MURAOKA Yuji.jpg\" width=\"320\" height=\"408\"><\/th>\n<td style=\"width: 80%\">\n<ul>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">Assoc. Prof. MURAOKA Yuji<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">E-mail: ymuraoka <span style=\"color: #0000ff\">[at]<\/span> okayama-u.ac.jp<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px\"><span style=\"font-size: 12pt\">Thin films, Surface, Interface<\/span><span style=\"text-decoration: underline\"><span style=\"font-size: 12pt\">\n<p><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt\"><a class=\"el_linkBtn\" href=\"https:\/\/soran.cc.okayama-u.ac.jp\/html\/b4b36d79a91d3fa574506e4da22f6611_en.html\">Directory of Researchers<\/a>&nbsp;<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>&nbsp;<\/h5>\n<div style=\"width: 240px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/img_MURAOKA.png\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/up_load_files\/areas\/areas07_phys\/img_MURAOKA.png\" alt=\"\" width=\"230\" height=\"146\"><\/a><p class=\"wp-caption-text\">Self-organised nanomultilayer structures through phase separation in metal oxide films<\/p><\/div>\n<p>Spontaneous Formation of nano-multilayered structures via phase separation (spinodal decomposition) in TiO2-VO2 films has been achieved. We have also succeeded in occurring metal-insulator transition characteristics in the multilayered films.<br \/>\nFor functional thin films, we are fabricating the allotrope of carbon, Q-carbon. We firstly succeeded in reproducing this material, and are currently conducting research toward the development of ferromagnetism and high-temperature superconductivity.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<table class=\"el_table_fix\" style=\"width: 100%;height: 233px\">\n<tbody>\n<tr style=\"height: 233px\">\n<th style=\"width: 20%;height: 233px\"><a href=\"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a1cb62f2230b986bd3fca71b922b6c81.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-3072\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a1cb62f2230b986bd3fca71b922b6c81.jpg\" alt=\"\" width=\"157\" height=\"218\"><\/a><\/th>\n<td style=\"width: 80%;height: 233px\">\n<ul>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px;text-align: left\"><span style=\"font-size: 12pt\">Assoc. Prof. OOTSUKI Daiki<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px;text-align: left\"><span style=\"font-size: 12pt\">E-mail: ootsuki.daiki <span style=\"color: #0000ff\">[at] <\/span>okayama-u.ac.jp<\/span><\/li>\n<li style=\"list-style-type: none;font-size: 12px;margin-left: -20px;text-align: left\"><span style=\"font-size: 12pt\">Electronic Structure\/Photoemission Spectroscopy\/Strongly Correlated Electron Systems\/Functional Materials<br \/>\n<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 12pt\"><a class=\"el_linkBtn\" href=\"https:\/\/soran.cc.okayama-u.ac.jp\/html\/40598a79e38ab679324722b072e43b5d_en.html\">Directory of Researchers<\/a> \u3000<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a href=\"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a67fa1184684188224ed403f3b3c2aaa.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-3071\" src=\"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a67fa1184684188224ed403f3b3c2aaa-300x241.jpg\" alt=\"\" width=\"300\" height=\"241\" srcset=\"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a67fa1184684188224ed403f3b3c2aaa-300x241.jpg 300w, https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-content\/uploads\/sites\/2\/2025\/05\/a67fa1184684188224ed403f3b3c2aaa.jpg 485w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>In a material, approximately 10\u00b2\u00b3 atoms are regularly arranged per cubic centimeter, and the numerous electrons associated with them interact with one another, resulting in an astonishing variety of properties. Under certain conditions, highly ordered states\u2014such as superconductivity, magnetism, or charge and orbital ordering\u2014emerge, which are difficult to imagine given the tremendous number of particles involved. Our research aims to understand such phenomena using photoemission spectroscopy, a technique that allows for direct observation of the electronic states of materials, in order to uncover their latent potential<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: right\"><span style=\"font-size: 10pt\">Fermi surface and band dispersion observed <\/span><\/p>\n<p style=\"text-align: right\"><span style=\"font-size: 10pt;text-align: right\">by angle-resolved photoemission spectroscopy<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; The properties (functionality) of a solid are determined by the states of electrons (energy, momentum a [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":140,"menu_order":41,"comment_status":"closed","ping_status":"closed","template":"template-layout_single.php","meta":{"footnotes":""},"class_list":["post-896","page","type-page","status-publish","hentry"],"aioseo_notices":[],"publishpress_future_action":{"enabled":false,"date":"2026-05-18 01:53:38","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/pages\/896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=896"}],"version-history":[{"count":20,"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/pages\/896\/revisions"}],"predecessor-version":[{"id":3502,"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/pages\/896\/revisions\/3502"}],"up":[{"embeddable":true,"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/pages\/140"}],"wp:attachment":[{"href":"https:\/\/www.elst.okayama-u.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}