{"id":293,"date":"2024-02-21T12:00:00","date_gmt":"2024-02-21T17:00:00","guid":{"rendered":"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/?p=293"},"modified":"2024-05-02T11:22:16","modified_gmt":"2024-05-02T15:22:16","slug":"yu-et-al-2024","status":"publish","type":"post","link":"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/","title":{"rendered":"Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor"},"content":{"rendered":"\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"585\" data-src=\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-1024x585.jpg\" alt=\"Scientific collage displaying mos2 monolayer characterization: optical image (a), raman spectra graph (b), photoluminescence mapping (c-f) with silicon and molybdenum distributions.\" class=\"wp-image-304 lazyload\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/585;width:auto;height:300px\" data-srcset=\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-1024x585.jpg 1024w, https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-300x172.jpg 300w, https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-768x439.jpg 768w, https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-1536x878.jpg 1536w, https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-2048x1171.jpg 2048w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Isotope effects have received increasing attention in materials science and engineering because altering isotopes directly affects phonons, which can affect both thermal properties and optoelectronic properties of conventional semiconductors. However, how isotopic mass affects the optoelectronic properties in 2D semiconductors remains unclear because of measurement uncertainties resulting from sample heterogeneities. Here, we report an anomalous optical bandgap energy red shift of 13 (\u00b17) milli\u2013electron volts as mass of Mo isotopes is increased in laterally structured\u00a0<sup>100<\/sup>MoS<sub>2<\/sub>&#8211;<sup>92<\/sup>MoS<sub>2<\/sub>\u00a0monolayers grown by a two-step chemical vapor deposition that mitigates the effects of heterogeneities. This trend, which is opposite to that observed in conventional semiconductors, is explained by many-body perturbation and time-dependent density functional theories that reveal unusually large exciton binding energy renormalizations exceeding the ground-state renormalization energy due to strong coupling between confined excitons and phonons. The isotope effect on the optical bandgap reported here provides perspective on the important role of exciton-phonon coupling in the physical properties of two-dimensional materials.<\/p>\n\n\n\n<p>This work was published in Science Advances. <br>[Y. Yu, V. Turkowski, J. A. Hachtel, A. A. Puretzky, A. V. Ievlev, N. U. Din, S. B. Harris, V. Iyer, C. M. Rouleau,\u00a0<strong>T. S. Rahman<\/strong>, D. B. Geohegan, K. Xiao, \u201cAnomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor.\u201d Sci. Adv. 10, eadj0758 (2024).\u00a0<a href=\"https:\/\/doi.org\/10.1126\/sciadv.adj0758\">https:\/\/doi.org\/10.1126\/sciadv.adj0758<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Isotope effects have received increasing attention in materials science and engineering because altering isotopes directly affects phonons, which can affect both thermal properties and optoelectronic properties of conventional semiconductors. However, how isotopic mass affects the optoelectronic properties in 2D semiconductors remains unclear because of measurement uncertainties resulting from sample heterogeneities. Here, we report an anomalous &#8230; <a title=\"Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor\" class=\"read-more\" href=\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\" aria-label=\"Read more about Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor\">Read more<\/a><\/p>\n","protected":false},"author":92,"featured_media":0,"comment_status":"off","ping_status":"off","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[4],"tags":[],"class_list":["post-293","post","type-post","status-publish","format-standard","hentry","category-home-slider"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor - Professor Talat S. Rahman<\/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:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor - Professor Talat S. Rahman\" \/>\n<meta property=\"og:description\" content=\"Isotope effects have received increasing attention in materials science and engineering because altering isotopes directly affects phonons, which can affect both thermal properties and optoelectronic properties of conventional semiconductors. However, how isotopic mass affects the optoelectronic properties in 2D semiconductors remains unclear because of measurement uncertainties resulting from sample heterogeneities. Here, we report an anomalous ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\" \/>\n<meta property=\"og:site_name\" content=\"Professor Talat S. Rahman\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-21T17:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-02T15:22:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-1024x585.jpg\" \/>\n<meta name=\"author\" content=\"Eric Switzer\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Eric Switzer\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\"},\"author\":{\"name\":\"Eric Switzer\",\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/#\/schema\/person\/9322103df41b82098f9f799c48f539da\"},\"headline\":\"Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor\",\"datePublished\":\"2024-02-21T17:00:00+00:00\",\"dateModified\":\"2024-05-02T15:22:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\"},\"wordCount\":234,\"image\":{\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/wp-content\/uploads\/sites\/40\/2024\/05\/sciadv.adj0758-f1-1024x585.jpg\",\"articleSection\":[\"Home Slider\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\",\"url\":\"https:\/\/sciences.ucf.edu\/physics\/rahman-group\/yu-et-al-2024\/\",\"name\":\"Anomalous isotope effect on the optical bandgap in a monolayer transition metal dichalcogenide semiconductor - Professor Talat S. 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