{"id":27,"date":"2014-10-29T11:57:35","date_gmt":"2014-10-29T09:57:35","guid":{"rendered":"http:\/\/phsites.technion.ac.il\/atomlab\/?page_id=27"},"modified":"2020-10-19T13:21:36","modified_gmt":"2020-10-19T11:21:36","slug":"josephson-effect-bose-einstein-condensate","status":"publish","type":"page","link":"https:\/\/phsites.technion.ac.il\/atomlab\/research\/josephson-effect-bose-einstein-condensate\/","title":{"rendered":"Josephson effect in a Bose-Einstein condensate"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Josephson effect in a Bose-Einstein condensate<\/h1>\n\n\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-87 size-full\" src=\"http:\/\/phsites.technion.ac.il\/atomlab\/wp-content\/uploads\/sites\/22\/2014\/10\/josephson.png\" alt=\"BEC Josephson junction\" width=\"316\" height=\"184\" align=\"right\" srcset=\"https:\/\/phsites.technion.ac.il\/atomlab\/wp-content\/uploads\/sites\/22\/2014\/10\/josephson.png 316w, https:\/\/phsites.technion.ac.il\/atomlab\/wp-content\/uploads\/sites\/22\/2014\/10\/josephson-300x174.png 300w\" sizes=\"auto, (max-width: 316px) 100vw, 316px\" \/>The Josephson effect was first discovered in a system of two superconductors separated by a tunneling barrier. In the AC Josephson effect, a constant voltage is applied between the two superconductors.&nbsp; This results in an oscillating tunneling current through the barrier, with a frequency proportional to the applied voltage.&nbsp; Since the proportionality constant involves fundamental constants only, the AC Josephson effect serves as the voltage standard.<\/p>\n<p>Applying a constant current results in the DC Josephson effect.&nbsp; This is a voltage-free current (a supercurrent), which flows through the tunneling barrier, as if the barrier were a superconductor.&nbsp; If the current is too large however, a voltage appears and a transition to the AC Josephson effect occurs.&nbsp; This sharp transition gives a SQUID (superconducting quantum interference device) its excellent sensitivity to magnetic flux.<\/p>\n<p>We made the first observation of both the AC and DC Josephson effects in a Bose-Einstein condensate.&nbsp; This pioneering work opened the door for the currently active area of trying build a SQUID analogue in a Bose-Einstein condensate, which would measure rotation rather than magnetic field.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Related publication<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Levi, S. Lahoud, E., Shomroni, I. &amp; Steinhauer J.&nbsp; The a.c. and d.c. Josephson effects in a Bose-Einstein condensate.&nbsp; Nature 449, 579 (2007).<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Josephson effect in a Bose-Einstein condensate The Josephson effect was first discovered in a system of two superconductors separated by a tunneling barrier. In the AC Josephson effect, a constant voltage is applied between the two superconductors.&nbsp; This results in an oscillating tunneling current through the barrier, with a frequency proportional to the applied voltage.&nbsp; &hellip;<\/p>\n","protected":false},"author":2,"featured_media":87,"parent":25,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"class_list":{"0":"post-27","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Josephson effect in a Bose-Einstein condensate - Steinhauer Atomic Physics Laboratory<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/phsites.technion.ac.il\/atomlab\/research\/josephson-effect-bose-einstein-condensate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Josephson effect in a Bose-Einstein condensate - Steinhauer Atomic Physics Laboratory\" \/>\n<meta property=\"og:description\" content=\"Josephson effect in a Bose-Einstein condensate The Josephson effect was first discovered in a system of two superconductors separated by a tunneling barrier. In the AC Josephson effect, a constant voltage is applied between the two superconductors.&nbsp; This results in an oscillating tunneling current through the barrier, with a frequency proportional to the applied voltage.&nbsp; &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/phsites.technion.ac.il\/atomlab\/research\/josephson-effect-bose-einstein-condensate\/\" \/>\n<meta property=\"og:site_name\" content=\"Steinhauer Atomic Physics Laboratory\" \/>\n<meta property=\"article:modified_time\" content=\"2020-10-19T11:21:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/phsites.technion.ac.il\/atomlab\/wp-content\/uploads\/sites\/22\/2014\/10\/josephson.png\" \/>\n\t<meta property=\"og:image:width\" content=\"316\" \/>\n\t<meta property=\"og:image:height\" content=\"184\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/\",\"url\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/\",\"name\":\"Josephson effect in a Bose-Einstein condensate - Steinhauer Atomic Physics Laboratory\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/wp-content\\\/uploads\\\/sites\\\/22\\\/2014\\\/10\\\/josephson.png\",\"datePublished\":\"2014-10-29T09:57:35+00:00\",\"dateModified\":\"2020-10-19T11:21:36+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/#primaryimage\",\"url\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/wp-content\\\/uploads\\\/sites\\\/22\\\/2014\\\/10\\\/josephson.png\",\"contentUrl\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/wp-content\\\/uploads\\\/sites\\\/22\\\/2014\\\/10\\\/josephson.png\",\"width\":316,\"height\":184,\"caption\":\"BEC Josephson junction\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/josephson-effect-bose-einstein-condensate\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Research Areas\",\"item\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/research\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Josephson effect in a Bose-Einstein condensate\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/#website\",\"url\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/\",\"name\":\"Steinhauer Atomic Physics Laboratory\",\"description\":\"Prof. Steinhauer Jeff - Atomic Physics Group\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/phsites.technion.ac.il\\\/atomlab\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Josephson effect in a Bose-Einstein condensate - Steinhauer Atomic Physics Laboratory","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/phsites.technion.ac.il\/atomlab\/research\/josephson-effect-bose-einstein-condensate\/","og_locale":"en_US","og_type":"article","og_title":"Josephson effect in a Bose-Einstein condensate - Steinhauer Atomic Physics Laboratory","og_description":"Josephson effect in a Bose-Einstein condensate The Josephson effect was first discovered in a system of two superconductors separated by a tunneling barrier. 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